Summary

• A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to obtain read/write file system access on the underlying operating system of an affected device.

  This vulnerability is due to insufficient validation of user arguments that are passed to specific CLI commands. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the prompt. A successful exploit could allow the attacker to elevate privileges to root.

  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-priv-esc-CrG5vhCq

  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

  This vulnerability affects Cisco IOS XR 64-Bit Software, regardless of device configuration.

  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:

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

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• Cisco has released free software updates that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

  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.

  The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.

  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.

  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
  7.11 and earlier	7.11.21 (Oct 2024)
  24.1	24.1.2
  24.2	Not affected.

  Cisco has released the following SMUs to address this vulnerability. Customers who require SMUs for 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
  7.11.2	ASR9K-X84 NCS540 NCS540L NCS5500 NCS5700	asr9k-x64-7.11.2.CSCwk94350 ncs540-7.11.2.CSCwk94350 ncs540l-7.11.2.CSCwk94350 ncs5500-7.11.2.CSCwk94350 ncs5700-7.11.2.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 Francesco Caserta and Alessandro Ruggieri of the Italian National Cybersecurity Agency (ACN) for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-priv-esc-CrG5vhCq

Revision History

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

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