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AUSCERT External Security Bulletin Redistribution
ESB-2020.2944
Cisco NX-OS Software - Multiple vulnerabilities
27 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco NX-OS Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3454 CVE-2020-3415 CVE-2020-3398
CVE-2020-3397 CVE-2020-3338
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-nlri-dos-458rG2OQ
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-callhome-cmdinj-zkxzSCY
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dme-rce-cbE3nhZS
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-memleak-dos-tC8eP7uw
Comment: This bulletin contains five (5) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco NX-OS Software Border Gateway Protocol Multicast VPN Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-nxosbgp-nlri-dos-458rG2OQ
First Published: 2020 August 26 16:00 GMT
Last Updated: 2020 August 26 20:54 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr58652
CVE-2020-3397
CWE-20
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN)
implementation of Cisco NX-OS Software could allow an unauthenticated,
remote attacker to cause an affected device to unexpectedly reload,
resulting in a denial of service (DoS) condition.
The vulnerability is due to incomplete input validation of a specific type
of BGP MVPN update message. An attacker could exploit this vulnerability by
sending this specific, valid BGP MVPN update message to a targeted device.
A successful exploit could allow the attacker to cause one of the
BGP-related routing applications to restart multiple times, leading to a
system-level restart.
Note: The Cisco implementation of BGP accepts incoming BGP traffic from
only explicitly configured peers. To exploit this vulnerability, an
attacker must send a specific BGP MVPN update message over an established
TCP connection that appears to come from a trusted BGP peer. To do so, the
attacker must obtain information about the BGP peers in the trusted network
of the affected system.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxosbgp-nlri-dos-458rG2OQ
This advisory is part of the August 2020 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes seven Cisco Security
Advisories that describe seven vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2020 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and BGP with MVPN is
configured:
Nexus 3000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
The following conditions must be true for a device to be vulnerable:
The device has feature ngmvpn configured.
The device has at least one BGP neighbor (peer) configured.
The device has a BGP connection that is configured for MPVN under the
BGP neighbor.
Note: These switches process BGP packets on TCP port 179 on IPv4 and IPv6.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
To determine whether a Nexus device is configured with BGP and a BGP
neighbor, use the show running-config | include mvpn CLI command from the
NX-OS CLI. If the configuration keyword mvpn is present, BGP is enabled.
The following example shows BGP enabled with MVPN:
nxos# show running-config | include mvpn
feature ngmvpn
...
address-family ipv4 mvpn
Note: The address-family ipv4|ipv6 mvpn CLI command must be configured
under the neighbor section of the BGP configuration.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, administrators can refer to the following Recommended
Releases documents. If a security advisory recommends a later release,
Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found by Hao Wu of Cisco during internal security
testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxosbgp-nlri-dos-458rG2OQ
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Fixed Software Checker | Fixed | Final | 2020-AUG-26 |
| | link. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-26 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session Denial of
Service Vulnerability
Priority: High
Advisory ID: cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp
First Published: 2020 August 26 16:00 GMT
Last Updated: 2020 August 26 20:56 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr60479
CVE-2020-3398
CWE-20
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN)
implementation of Cisco NX-OS Software could allow an unauthenticated,
remote attacker to cause a BGP session to repeatedly reset, causing a
partial denial of service (DoS) condition due to the BGP session being
down.
The vulnerability is due to incorrect parsing of a specific type of BGP
MVPN update message. An attacker could exploit this vulnerability by
sending this BGP MVPN update message to a targeted device. A successful
exploit could allow the attacker to cause the BGP peer connections to
reset, which could lead to BGP route instability and impact traffic. The
incoming BGP MVPN update message is valid but is parsed incorrectly by the
NX-OS device, which could send a corrupted BGP update to the configured BGP
peer.
Note: The Cisco implementation of BGP accepts incoming BGP traffic from
only explicitly configured peers. To exploit this vulnerability, an
attacker must send a specific BGP MVPN update message over an established
TCP connection that appears to come from a trusted BGP peer. To do so, the
attacker must obtain information about the BGP peers in the trusted network
of the affected system.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp
This advisory is part of the August 2020 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes seven Cisco Security
Advisories that describe seven vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2020 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and BGP with MVPN is
configured:
Nexus 3000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
The following conditions must be true for a device to be vulnerable:
The device has feature ngmvpn configured.
The device has at least one BGP neighbor (peer) configured.
The device has a BGP connection that is configured for MPVN under the
BGP neighbor.
Note: These switches process BGP packets on TCP port 179 on IPv4 and IPv6.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
To determine whether a Nexus device is configured with BGP and a BGP
neighbor, use the show running-config | include mvpn CLI command from the
NX-OS CLI. If the configuration keyword mvpn is present, BGP is enabled.
The following example shows BGP enabled with MVPN:
nxos# show running-config | include mvpn
.
.
.
feature ngmvpn
...
address-family ipv4 mvpn
Note: The address-family ipv4|ipv6 mvpn CLI command must be configured
under the neighbor section of the BGP configuration.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, administrators can refer to the following Recommended
Releases documents. If a security advisory recommends a later release,
Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found by Aidon Lebar of Cisco during internal
security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Fixed Software Checker | Fixed | Final | 2020-AUG-26 |
| | link. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-26 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Call Home Command Injection Vulnerability
Priority: High
Advisory ID: cisco-sa-callhome-cmdinj-zkxzSCY
First Published: 2020 August 26 16:00 GMT
Last Updated: 2020 August 26 20:51 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve15011 CSCvg11715 CSCvg11732 CSCvg11752 CSCvh85161
CVE-2020-3454
CWE-20
CVSS Score:
7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Call Home feature of Cisco NX-OS Software could
allow an authenticated, remote attacker to inject arbitrary commands that
could be executed with root privileges on the underlying operating system
(OS).
The vulnerability is due to insufficient input validation of specific Call
Home configuration parameters when the software is configured for transport
method HTTP. An attacker could exploit this vulnerability by modifying
parameters within the Call Home configuration on an affected device. A
successful exploit could allow the attacker to execute arbitrary commands
with root privileges on the underlying OS.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-callhome-cmdinj-zkxzSCY
This advisory is part of the August 2020 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes seven Cisco Security
Advisories that describe seven vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2020 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and have the Call Home feature
enabled with transport method HTTP:
MDS 9000 Series Multilayer Switches ( CSCvh85161 )
Nexus 3000 Series Switches ( CSCvg11715 )
Nexus 3600 Platform Switches ( CSCvg11752 ) ^ 1
Nexus 5500 Platform Switches ( CSCve15011 )
Nexus 5600 Platform Switches ( CSCve15011 )
Nexus 6000 Series Switches ( CSCve15011 )
Nexus 7000 Series Switches ( CSCvg11732 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvg11715 )
Nexus 9500 R-Series Switching Platform ( CSCvg11752 ) ^ 1
1. For this advisory only, Cisco Nexus 3600 Platform Switches and Nexus
9500 R-Series Switching Platform are listed separately from the Cisco Nexus
3000 and 9000 Series Switches because the vulnerability was fixed under a
different bug ID.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether the Call Home Feature Is Configured with Transport Method
HTTP
To verify that the device is configured for the Call Home feature with the
transport method HTTP, execute the command show running-config callhome and
verify that the following elements are present:
callhome
email-contact xxyy@zzz.com
destination-profile full_txt transport-method http
destination-profile full_txt http http://<snip>
enable
The destination-profile URL can be configured to use either HTTP or HTTPS.
Both are affected.
For Cisco Nexus 3000 and 9000 Series Switches that are running software
releases 9.3(1) and later, the command syntax for the HTTP URL has two
additional parameters, which are index and a number. The rest of the
configuration remains the same. The following example shows the command
syntax if the device is configured to use HTTPS:
destination-profile full_txt index 1 http https://<snip>
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-callhome-cmdinj-zkxzSCY
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Fixed Software Checker | Fixed | Final | 2020-AUG-26 |
| | link. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | | Final | 2020-AUG-26 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Data Management Engine Remote Code Execution Vulnerability
Priority: High
Advisory ID: cisco-sa-nxos-dme-rce-cbE3nhZS
First Published: 2020 August 26 16:00 GMT
Last Updated: 2020 August 26 21:13 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr89315 CSCvs10167
CVE-2020-3415
CWE-787
CVSS Score:
8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Data Management Engine (DME) of Cisco NX-OS Software
could allow an unauthenticated, adjacent attacker to execute arbitrary code
with administrative privileges or cause a denial of service (DoS) condition
on an affected device.
The vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by sending a crafted Cisco Discovery
Protocol packet to a Layer 2-adjacent affected device. A successful exploit
could allow the attacker to execute arbitrary code with administrative
privileges or cause the Cisco Discovery Protocol process to crash and
restart multiple times, causing the affected device to reload and resulting
in a DoS condition.
Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit this
vulnerability, an attacker must be in the same broadcast domain as the
affected device (Layer 2 adjacent). Exploitation of this vulnerability also
requires jumbo frames to be enabled on the interface that receives the
crafted Cisco Discovery Protocol packets on the affected device.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxos-dme-rce-cbE3nhZS
This advisory is part of the August 2020 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes seven Cisco Security
Advisories that describe seven vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2020 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software:
Nexus 3000 Series Switches ( CSCvr89315 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvr89315 )
UCS 6400 Series Fabric Interconnects ( CSCvs10167 )
For a device to be vulnerable, both of the following conditions must be
true:
DME is enabled.
Cisco Discovery Protocol is enabled on at least one interface that
allows jumbo frames.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Status of the Data Management Engine
DME is disabled by default on Cisco Nexus 3000 Series Switches that have 4
GB of system memory or less. DME is enabled by default and cannot be
disabled on Cisco Nexus 3000 Series Switches that have higher system
memory.
To determine whether DME is enabled on Cisco Nexus 3000 Series Switches, do
the following:
Verify the amount of system memory by using the show version | include
memory command in the device CLI. If the memory value is higher than 4
GB (4194304 KB), DME is enabled and cannot be disabled.
If the memory value is equal to 4 GB or lower, use the show system dme
status command in the device CLI to verify whether DME is enabled or
disabled.
DME is enabled by default on Cisco Nexus 9000 Series Switches and on Cisco
UCS 6400 Series Fabric Interconnects and cannot be disabled on these
devices.
Determine the Status of Jumbo Frames
By default, each interface of a Cisco Nexus Switch has a Maximum
Transmission Unit (MTU) of 1500 bytes, which is the IEEE 802.3 standard for
Ethernet frames. Larger frames, called jumbo frames, are not allowed by
default. Administrators can enable jumbo frames by setting a larger MTU
with a network Quality of Service (QoS) policy or, on switches that support
per-port MTU configuration, by configuring the MTU of the interface itself.
To determine whether jumbo frames are enabled on a Cisco Nexus Switch with
a network QoS policy, use the show policy-map system type network-qos
command in the device CLI. If the command returns an MTU value higher than
1500 bytes, jumbo frames are enabled on the device, as shown in the
following example:
nxos# show policy-map system type network-qos
Type network-qos policy-maps
============================
policy-map type network-qos jumbo
class type network-qos class-default
match qos-group 0
mtu 9216
To determine whether jumbo frames are enabled on an interface of a Cisco
Nexus Switch, use the show running-config interface | include mtu command
in the device CLI. If the command returns at least one line of output,
jumbo frames are enabled on at least one interface, as shown in the
following example:
nxos# show running-config interface | include mtu
mtu 9216
Cisco UCS 6400 Series Fabric Interconnects have jumbo frames enabled by
default on all interfaces, except the management interface. It is not
possible to modify the MTU of physical interfaces on these devices.
Determine the Status of Cisco Discovery Protocol on Cisco Nexus Switches
Cisco Discovery Protocol is enabled by default both globally and on all
interfaces on Cisco Nexus Switches.
To determine whether Cisco Discovery Protocol is enabled on a device, use
the show running-config cdp all | include "cdp enable" command in the
device CLI. If the command returns at least the following lines, Cisco
Discovery Protocol is enabled globally and on at least one interface:
nxos# show running-config cdp all | include "cdp enable"
cdp enable
cdp enable
Determine the Status of Cisco Discovery Protocol on Cisco UCS Fabric
Interconnects
Cisco Discovery Protocol is always enabled on Ethernet uplink ports
(network interfaces that connect to upstream switches for network
connectivity), Ethernet port channel members, FCoE uplink ports, and
management interfaces of Cisco UCS Fabric Interconnects.
To determine whether Cisco Discovery Protocol is also enabled on server
ports (interfaces that are presented to the servers in the Cisco UCS
Manager domain) and appliance ports (interfaces that connect to directly
attached NFS storage) on a device, use the show configuration | egrep "^
scope|enable cdp" command in the device CLI. If the command returns the
enable cdp command under the org scope, Cisco Discovery Protocol is enabled
on server ports, and if the command returns enable cdp under the
eth-storage scope, Cisco Discovery Protocol is enabled on appliance ports,
as shown in the following example:
ucs-fi# show configuration | egrep "^ scope|enable cdp"
.
.
.
scope org
enable cdp
.
.
.
scope eth-storage
enable cdp
.
.
.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
However, customers who do not use the Cisco Discovery Protocol feature can
disable it either globally to fully eliminate the attack vector or on
individual interfaces to reduce the attack surface.
Disable Cisco Discovery Protocol Globally on Cisco Nexus Switches
To disable Cisco Discovery Protocol globally on Cisco Nexus Switches, use
the no cdp enable command in global configuration mode, as shown in the
following example:
nxos# conf t
Enter configuration commands, one per line. End with CNTL/Z.
nxos(config)# no cdp enable
nxos(config)# end
nxos# copy running-config startup-config
[########################################] 100%
Copy complete.
Disable Cisco Discovery Protocol on an Interface on Cisco Nexus Switches
To disable Cisco Discovery Protocol on an interface on Cisco Nexus
Switches, use the no cdp enable command in interface configuration mode, as
shown in the following example:
nxos# conf t
Enter configuration commands, one per line. End with CNTL/Z.
nxos(config)# interface Ethernet1/1
nxos(config-if)# no cdp enable
nxos(config-if)# end
nxos# copy running-config startup-config
[########################################] 100%
Copy complete.
Disable Cisco Discovery Protocol on Cisco UCS Fabric Interconnects
Cisco Discovery Protocol cannot be disabled completely on Cisco UCS Fabric
Interconnects.
Cisco Discovery Protocol can be disabled on server ports and appliance
ports on Cisco UCS Fabric Interconnects, but it cannot be disabled on
Ethernet uplink ports, Ethernet port channel members, FCoE uplink ports, or
management interfaces.
To disable Cisco Discovery Protocol on the server ports of a Cisco UCS
Fabric Interconnect, use the disable cdp command in the default
nw-ctrl-policy in the org scope, as shown in the following example:
ucs-fi# scope org
ucs-fi /org # enter nw-ctrl-policy default
ucs-fi /org/nw-ctrl-policy # disable cdp
ucs-fi /org/nw-ctrl-policy* # exit
ucs-fi /org* # exit
ucs-fi* # commit-buffer
ucs-fi#
To disable Cisco Discovery Protocol on the appliance ports of a Cisco UCS
Fabric Interconnect, use the disable cdp command in the default
nw-ctrl-policy in the eth-storage scope, as shown in the following example:
ucs-fi* # scope eth-storage
ucs-fi /eth-storage* # enter nw-ctrl-policy default
ucs-fi /eth-storage/nw-ctrl-policy* # disable cdp
ucs-fi /eth-storage/nw-ctrl-policy* # exit
ucs-fi /eth-storage* # exit
ucs-fi* # commit-buffer
ucs-fi#
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Cisco UCS Software
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by all the vulnerabilities described in this bundle
and which release includes fixes for those vulnerabilities.
UCS 6400 Series Fabric Interconnects
Cisco UCS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
4.0 4.0(4h) 4.0(4i)
4.1 Not vulnerable 4.1(1c)
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found by Karthick Murugan of Cisco during internal
security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxos-dme-rce-cbE3nhZS
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Fixed Software Checker | Fixed | Final | 2020-AUG-26 |
| | link. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-26 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software IPv6 Protocol Independent Multicast Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-nxos-pim-memleak-dos-tC8eP7uw
First Published: 2020 August 26 16:00 GMT
Last Updated: 2020 August 26 20:42 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr91853 CSCvr97684
CVE-2020-3338
CWE-404
CVSS Score:
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Protocol Independent Multicast (PIM) feature for
IPv6 networks (PIM6) of Cisco NX-OS Software could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
condition on an affected device.
The vulnerability is due to improper error handling when processing inbound
PIM6 packets. An attacker could exploit this vulnerability by sending
multiple crafted PIM6 packets to an affected device. A successful exploit
could allow the attacker to cause the PIM6 application to leak system
memory. Over time, this memory leak could cause the PIM6 application to
stop processing legitimate PIM6 traffic, leading to a DoS condition on the
affected device.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxos-pim-memleak-dos-tC8eP7uw
This advisory is part of the August 2020 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes seven Cisco Security
Advisories that describe seven vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2020 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and have the feature pim6
command configured:
Nexus 3000 Series Switches ( CSCvr91853 )
Nexus 7000 Series Switches ( CSCvr97684 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvr91853 )
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
To reduce the attack surface, use infrastructure access control lists
(iACLs), as recommended in the Cisco Guide to Securing NX-OS Software
Devices . Using iACLs allows access from explicitly trusted source IP
addresses only.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-nxos-pim-memleak-dos-tC8eP7uw
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Fixed Software Checker | Fixed | Final | 2020-AUG-26 |
| | link. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-26 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------END INCLUDED TEXT--------------------
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