Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2020.0707
Cisco NX-OS Software Vulnerabilities
27 February 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco NX-OS
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3174 CVE-2020-3170 CVE-2020-3165
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-arp
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-bgpmd5
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-api-dos
Comment: This bulletin contains three (3) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco NX-OS Software Anycast Gateway Invalid ARP Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200226-nxos-arp
First Published: 2020 February 26 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvq48220
CVE-2020-3174
CWE-345
CVSS Score:
4.7 AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the anycast gateway feature of Cisco NX-OS Software
could allow an unauthenticated, adjacent attacker to cause a device to
learn invalid Address Resolution Protocol (ARP) entries. The ARP entries
are for nonlocal IP addresses for the subnet.
The vulnerability is due to improper validation of a received gratuitous
ARP (GARP) request. An attacker could exploit this vulnerability by sending
a malicious GARP packet on the local subnet to cause the ARP table on the
device to become corrupted. A successful exploit could allow the attacker
to populate the ARP table with incorrect entries, which could lead to
traffic disruptions.
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-20200226-nxos-arp
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco NX-OS Software
and had the anycast gateway feature enabled:
Nexus 3000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory.
Determine the Status of the Anycast Gateway Feature
Administrators can determine whether the anycast gateway feature is
configured on a device by using the show running-config command in the
device CLI. If the command returns output, the anycast gateway feature is
configured:
nxos-switch# show running-config
.
.
.
fabric forwarding mode anycast-gateway
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
Indicators of Compromise
o Administrators can use the CLI command show ip arp detail to display the
ARP table. If the table contains an ARP address for a nonlocal IP address,
the device could have been compromised by exploitation of this
vulnerability. Contact the Cisco Technical Assistance Center (TAC) to
determine whether this compromise has occurred.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts 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.
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 Nexus 7000 Series Switches SMUs
For Cisco Nexus 7000 Series Switches, software maintenance upgrades (SMUs)
are available for Cisco NX-OS Software Release 8.4(1). Customers can
download the following SMUs from the Software Center on Cisco.com:
n7700-s3-dk9.8.4.1.CSCvs27997.bin
n7700-s2-dk9.8.4.1.CSCvs27997.bin
n7000-s2-dk9.8.4.1.CSCvs27997.bin
For details about downloading and installing SMUs in Cisco NX-OS Software
for Cisco Nexus 7000 Series Switches, see the Performing Software
Maintenance Upgrades section of the Cisco Nexus 7000 Series NX-OS System
Management Configuration Guide .
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, 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 Cisco would like to thank Jens Krabbenhoeft of Rauscher networX for
reporting this vulnerability.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200226-nxos-arp
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-FEB-26 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Border Gateway Protocol MD5 Authentication Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200226-nxos-bgpmd5
First Published: 2020 February 26 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCvq72707
CVE-2020-3165
CWE-798
CVSS Score:
8.2 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the implementation of Border Gateway Protocol (BGP)
Message Digest 5 (MD5) authentication in Cisco NX-OS Software could allow
an unauthenticated, remote attacker to bypass MD5 authentication and
establish a BGP connection with the device.
The vulnerability occurs because the BGP MD5 authentication is bypassed if
the peer does not have MD5 authentication configured, the NX-OS device does
have BGP MD5 authentication configured, and the NX-OS BGP virtual routing
and forwarding (VRF) name is configured to be greater than 19 characters.
An attacker could exploit this vulnerability by attempting to establish a
BGP session with the NX-OS peer. A successful exploit could allow the
attacker to establish a BGP session with the NX-OS device without MD5
authentication.
The Cisco implementation of the BGP protocol accepts incoming BGP traffic
only from explicitly configured peers. To exploit this vulnerability, an
attacker must send the malicious packets over a 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 affected system's trusted network.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200226-nxos-bgpmd5
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running Cisco NX-OS Software Release 9.2(1), 9.2(2),
9.2(3), or 9.3(1); had BGP MD5 authentication configured; and had the NX-OS
BGP VRF name configured to be greater than 19 characters:
Nexus 3000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
Determine Whether BGP MD5 Authentication Is Configured
The administrator can determine whether BGP MD5 authentication is
configured on the Cisco NX-OS device by using the show ip bgp neighbors CLI
command. Note: The vulnerability is that the BGP peer may not have BGP MD5
authentication configured but the BGP session could still be established
with the device.
# show ip bgp neighbors
BGP neighbor is x.x.x.x, remote AS 65148, ebgp link, Peer index 3
.
.
.
TCP MD5 authentication is set (enabled)
.
.
.
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 As a workaround, administrators may reconfigure the VRF name to be 19
characters or less.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts 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.
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, 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 the resolution of a Cisco TAC support
case.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200226-nxos-bgpmd5
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-FEB-26 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software NX-API Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200226-nxos-api-dos
First Published: 2020 February 26 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvp94847
CVE-2020-3170
CWE-20
CVSS Score:
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
Summary
o A vulnerability in the NX-API feature of Cisco NX-OS Software could allow
an unauthenticated, remote attacker to cause an NX-API system process to
unexpectedly restart.
The vulnerability is due to incorrect validation of the HTTP header of a
request that is sent to the NX-API. An attacker could exploit this
vulnerability by sending a crafted HTTP request to the NX-API on an
affected device. A successful exploit could allow the attacker to cause a
denial of service (DoS) condition in the NX-API service; however, the Cisco
NX-OS device itself would still be available and passing network traffic.
Note: The NX-API feature is disabled by default.
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-20200226-nxos-api-dos
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they had the NX-API feature enabled:
MDS 9000 Series Multilayer Switches that were running Cisco NX-OS
Software releases earlier than Release 8.4(1)
Nexus 7000 Series Switches that were running Cisco NX-OS Software
releases earlier than Release 8.2(5)
This vulnerability affects only Cisco NX-OS devices that have the NX-API
feature enabled. The NX-API feature is disabled by default. To determine
whether an affected device is configured with the NX-API feature enabled,
administrators can use the show feature | include nxapi command from the
Cisco NX-OS CLI and verify that the feature is enabled. The following
example shows the NX-API feature enabled on a device that is running Cisco
NX-OS Software:
nxos-switch# show feature | include nxapi
nxapi 1 enabled
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 3000 Series Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
Nexus 9000 Series Switches in standalone NX-OS mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Details
o To exploit this vulnerability, a remote attacker must send a crafted HTTP
or HTTPS packet to the external NX-API.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts 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.
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, 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200226-nxos-api-dos
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-FEB-26 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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