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AUSCERT External Security Bulletin Redistribution
ESB-2019.1755
Cisco Nexus 3000 Series and 9000 Series Switches in NX-OS Mode CLI Command
Software Image Signature Verification Vulnerability
16 May 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Nexus 3000 Series and 9000 Series Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1810
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-sisv
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Cisco Nexus 3000 Series and 9000 Series Switches in NX-OS Mode CLI Command
Software Image Signature Verification Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190515-nxos-sisv
First Published: 2019 May 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvj14078
CVE-2019-1810
CWE-347
CVSS Score:
6.7 AV:L/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 Image Signature Verification feature used in an
NX-OS CLI command in Cisco Nexus 3000 Series and 9000 Series Switches could
allow an authenticated, local attacker with administrator-level credentials
to install a malicious software image on an affected device.
The vulnerability exists because software digital signatures are not
properly verified during CLI command execution. An attacker could exploit
this vulnerability to install an unsigned software image on an affected
device.
Note: If the device has not been patched for the vulnerability previously
disclosed in the Cisco Security Advisory cisco-sa-20190306-nxos-sig-verif ,
a successful exploit could allow the attacker to boot a malicious software
image.
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-20190515-nxos-sisv
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 with the following product IDs (PIDs):
N3K-C3164Q
N3K-C3232C
Nexus 9000 Series Switches in standalone NX-OS mode with the following
PIDs:
N9K-C92304QC
N9K-C9232C
Note: This vulnerability affects a limited number of products; only the
preceding PIDs are affected by this vulnerability.
For information about which Cisco NX-OS Software releases are vulnerable,
see the Fixed Software section of this advisory.
Determining the Cisco NX-OS Product ID
To check the PID, administrators can use the show inventory command in the
device CLI. The following example shows the output of the command for a
device that has the PID N3K-C3232C :
switch# show inventory
NAME: "Chassis", DESCR: "Nexus3000 C3232C Chassis"
PID: N3K-C3232C , VID: V02 , SN: FOC20291JA0
NAME: "Slot 1", DESCR: "32x40/100G QSFP28 2x10G SFP+ Ethernet Module"
PID: N3K-C3232C , VID: V02 , SN: FOC20291JA0
NAME: "Power Supply 1", DESCR: "Nexus3000 C3232C Chassis Power Supply"
PID: NXA-PAC-650W-PI , VID: V01 , SN: LIT20362Z6G
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 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 3500 Platform Switches
Nexus 3600 Platform Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
Nexus 9500 R-Series Switching Platform
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 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.
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.
Fixed Releases
Customers are advised to upgrade to an appropriate release as indicated in
the following table. In the table, the left column lists the affected PIDs.
The first affected Cisco NX-OS Software releases for each PID are in the
center column. The right column indicates the first release that includes
the fix for this vulnerability.
Note: A complete fix for this vulnerability requires that a proper BIOS
version is installed. Customers who are running a vulnerable PID listed in
the following table may not have upgraded the BIOS when the software was
installed even if they are running a fixed software release. Customers are
advised to confirm that the BIOS is running a fixed BIOS version (first
fixed or later) as described in the previously disclosed Cisco Security
Advisory cisco-sa-20190306-nxos-sig-verif .
Nexus 3000 Series Switches and Nexus 9000 Series Switches in Standalone
NX-OS Mode: CSCvj14078
Affected First Affected Release for This First Fixed Releases for This
Product ID Vulnerability Vulnerability
N3K-C3164Q 6.1(2)I3(4) 7.0(3)I7(5), 9.2(2)
N3K-C3232C 7.0(3)I3(1) 7.0(3)I7(1), 9.2(1)
N9K-C92304QC 7.0(3)I4(1) 7.0(3)I7(5), 9.2(2)
N9K-C9232C 7.0(3)I4(2) 7.0(3)I7(5), 9.2(2)
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 and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
For help determining the best Cisco NX-OS Software release for Cisco UCS,
refer to 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-20190515-nxos-sisv
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-May-15 |
+----------+---------------------------+----------+--------+--------------+
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