Summary

• A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to read any file in the file system of the underlying Linux operating system. The attacker must have valid credentials on the affected device.

  This vulnerability is due to incorrect validation of the arguments that are passed to a specific CLI command. An attacker could exploit this vulnerability by logging in to an affected device with low-privileged credentials and using the affected command. A successful exploit could allow the attacker access files in read-only mode on the Linux file 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-shellutil-HCb278wD

  This advisory is part of the September 2024 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2024 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication.

Affected Products

• Vulnerable Products

  At the time of publication, this vulnerability affected Cisco IOS XR 64-Bit Software, regardless of device configuration.

  For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.

  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:

  • IOS Software
  • IOS XE Software
  • IOS XR 32-bit Software
  • NX-OS Software

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• 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.

  Fixed Releases

  In the following table, the left column lists Cisco software releases or trains. The right column indicates whether a release (train) is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability.

  Cisco IOS XR Software Release	First Fixed Release
  7.10 and earlier	Migrate to a fixed release.
  7.11	7.11.2
  24.1	24.1.2
  24.2	Not affected.

  At the time of publication, Cisco had released the following SMUs to address this vulnerability. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information, including SMU availability. Customers who require SMUs for platforms or releases that are not listed are advised to contact their support organization.

  Cisco IOS XR Software Release	Platform	SMU Name
  7.3.2	ASR9K-X64 NCS540 NCS560 NCS5500	asr9k-x64-7.3.2.CSCwk94350 ncs540-7.3.2.CSCwk94350 ncs560-7.3.2.CSCwk94350 ncs5500-7.3.2.CSCwk94350
  7.5.2	8000 Series ASR9K-X64 NCS540 NCS540L NCS560 NCS5500	8000-7.5.2.CSCwk94350 asr9k-x64-7.5.2.CSCwk94350 ncs540-7.5.2.CSCwk94350 ncs540l-7.5.2.CSCwk94350 ncs560-7.5.2.CSCwk94350 ncs5500-7.5.2.CSCwk94350
  7.7.2	8000 Series ASR9K-X64	8000-7.7.2.CSCwk94350 asr9k-x64-7.7.2.CSCwk94350
  7.8.2	ASR9K-X64 NCS540 NCS5500	asr9k-x64-7.8.2.CSCwk94350 ncs540-7.8.2.CSCwk94350 ncs5500-7.8.2.CSCwk94350
  7.9.2	8000 Series ASR9K-X64 NCS5500	8000-7.9.2.CSCwk94350 asr9k-x64-7.9.2.CSCwk94350 ncs5500-7.9.2.CSCwk94350
  7.9.21	ASR9K-X64	asr9k-x64-7.9.21.CSCwk94350
  7.10.2	8000 Series ASR9K-X64 NCS560	8000-7.10.2.CSCwk94350 asr9k-x64-7.10.2.CSCwk94350 ncs560-7.10.2.CSCwk94350

  The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• Cisco would like to thank Alberto Crosta of Bip Consulting for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-shellutil-HCb278wD

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2024-SEP-11

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