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AUSCERT External Security Bulletin Redistribution
ESB-2023.1132
Cisco NX-OS Software CLI Command Injection Vulnerability
23 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: NX-OS Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20050
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cli-cmdinject-euQVK9u
Comment: CVSS (Max): 4.4 CVE-2023-20050 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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Cisco NX-OS Software CLI Command Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-nxos-cli-cmdinject-euQVK9u
First Published: 2023 February 22 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwd00653 CSCwd18009 CSCwd18011 CSCwd18012 CSCwd18013
CVE Names: CVE-2023-20050
Summary
o A vulnerability in the CLI of Cisco NX-OS Software could allow an
authenticated, local attacker to execute arbitrary commands on the
underlying operating system of an affected device.
This vulnerability is due to insufficient validation of arguments that are
passed to specific CLI commands. An attacker could exploit this
vulnerability by including crafted input as the argument of an affected
command. A successful exploit could allow the attacker to execute arbitrary
commands on the underlying operating system with the privileges of the
currently logged-in user.
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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cli-cmdinject-euQVK9u
This advisory is part of the February 2023 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication. For a complete list of the
advisories and links to them, see Cisco Event Response: February 2023
Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled
Publication .
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:
MDS 9000 Series Multilayer Switches ( CSCwd18009 )
Nexus 1000 Virtual Edge for VMware vSphere ( CSCwd18012 )
Nexus 1000V Switch for Microsoft Hyper-V ( CSCwd18012 )
Nexus 1000V Switch for VMware vSphere ( CSCwd18012 )
Nexus 3000 Series Switches ( CSCwd00653 )
Nexus 5500 Platform Switches ( CSCwd18013 )
Nexus 5600 Platform Switches ( CSCwd18013 )
Nexus 6000 Series Switches ( CSCwd18013 )
Nexus 7000 Series Switches ( CSCwd18011 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCwd00653 )
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
Nexus 9000 Series Fabric Switches in ACI mode
Secure Firewall 3100 Series
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
UCS 6500 Series Fabric Interconnects
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 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 . This tool
identifies any Cisco security advisories that impact a specific 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 that the Software Checker identifies ("Combined First
Fixed").
To use the tool, go to the Cisco Software Checker page and follow the
instructions. Alternatively, use the following form to search for
vulnerabilities that affect a specific software release. To use the form,
follow these steps:
1. Choose which advisories the tool will search-only this advisory, only
advisories with a Critical or High Security Impact Rating (SIR) , or
all advisories.
2. Choose the appropriate software.
3. Choose the appropriate platform.
4. Enter a release number-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.
5. Click Check .
Cisco Nexus 3000, 7000, and 9000 Series Switches SMUs
Cisco has released the following SMUs to address this vulnerability.
Customers can download the SMUs from the Software Center on Cisco.com.
Cisco Platform SMU Name
NX-OS
Software
Release
Nexus 7000 n7000-s2-dk9.8.2.9.CSCwd18011.bin
8.2(9) Series n7700-s2-dk9.8.2.9.CSCwd18011.bin
Switches
Nexus 3000
9.3(10) and 9000 nxos.CSCwd00653-n9k_ALL-1.0.0-9.3.10.lib32_n9000.rpm
Series
Switches
Nexus 3000
10.2(4) and 9000 nxos64-cs.CSCwd00653-1.0.0-10.2.4.lib32_64_n9000.rpm
Series nxos64-msll.CSCwd00653-1.0.0-10.2.4.lib32_64_n9000.rpm
Switches
For details about downloading and installing SMUs in Cisco NX-OS Software
for Cisco Nexus 3000, 7000, and 9000 Series Switches, see the Performing
Software Maintenance Upgrades section of the Cisco NX-OS system management
configuration guides for Cisco Nexus 3000 Series Switches , Cisco Nexus
7000 Series Switches , and Cisco Nexus 9000 Series Switches .
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.
Subscribe to Cisco Security Notifications
o Subscribe
Related to This Advisory
o Cisco Event Response: February 2023 Semiannual Cisco FXOS and NX-OS
Software Security Advisory Bundled Publication
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cli-cmdinject-euQVK9u
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2023-FEB-22 |
+----------+---------------------------+----------+--------+--------------+
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