CVE-2023-20032: Cisco Security Advisory: ClamAV HFS+ Partition Scanning Buffer Overflow Vulnerability Affecting Cisco Products: February 2023

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Summary

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• On Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed:

  A vulnerability in the HFS+ partition file parser of ClamAV versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier could allow an unauthenticated, remote attacker to execute arbitrary code.

  This vulnerability is due to a missing buffer size check that may result in a heap buffer overflow write. An attacker could exploit this vulnerability by submitting a crafted HFS+ partition file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the ClamAV scanning process, or else crash the process, resulting in a denial of service (DoS) condition.

  For a description of this vulnerability, see the ClamAV blog.

  Notes:

  • The Security Impact Rating (SIR) for this vulnerability is Critical only for Windows-based platforms because those platforms run the ClamAV scanning process in a privileged security context. The platforms that are critically impacted include Cisco Secure Endpoint Connector for Windows.
  • The SIR for this vulnerability is Medium on other platforms, including Linux and Mac platforms, because those platforms run the ClamAV scanning process in a lower-privileged security context. The affected platforms include Cisco Secure Web Appliance and Secure Endpoint Connector for Linux and Mac.
  • Cisco Secure Endpoint Private Cloud itself is not impacted by this vulnerability. However, the Secure Endpoint Connector software that is distributed from the device is impacted.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-q8DThCy

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Affected Products

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• Cisco investigated its product line to determine which products may be affected by this vulnerability.

  The Vulnerable Products section includes Cisco bug IDs for each affected product. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.

  Any product not listed in the Vulnerable Products section of this advisory is to be considered not vulnerable.

  The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. If a future release date is indicated for software, the date provided represents an estimate based on all information known to Cisco as of the Last Updated date at the top of the advisory. Availability dates are subject to change based on a number of factors, including satisfactory testing results and delivery of other priority features and fixes.

  Cisco Product

  Cisco Bug ID

  Fixed Release Availability

  Secure Endpoint, formerly Advanced Malware Protection (AMP) for Endpoints, for Linux

  CSCwd74133

  1.20.21

  Secure Endpoint, formerly Advanced Malware Protection (AMP) for Endpoints, for MacOS

  CSCwd74134

  1.21.11

  Secure Endpoint, formerly Advanced Malware Protection (AMP) for Endpoints, for Windows

  CSCwd74135

  7.5.9 1
  8.1.5

  Secure Endpoint Private Cloud

  CSCwe18204

  3.6.0 or later with updated connectors2

  Secure Web Appliance, formerly Web Security Appliance

  CSCwd74132

  12.5.6 (May 2023)
  14.0.4-005
  14.5.1-013 (Mar 2023)
  15.0.0-254 (April 2023)

  1. Updated releases of Cisco Secure Endpoint are available through the Cisco Secure Endpoint portal. Depending on the configured policy, Cisco Secure Endpoint will automatically update.
  2. Affected releases of Cisco Secure Endpoint clients for Cisco Secure Endpoint Private Cloud have been updated in the connectors repository. Customers will get these connector updates through normal content update processes.

  Attention: Simplifying the Cisco portfolio includes the renaming of security products under one brand: Cisco Secure. For more information, see Meet Cisco Secure.

  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:

  • Secure Email Gateway, formerly Email Security Appliance
  • Secure Email and Web Manager, formerly Security Management Appliance

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Workarounds

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• There are no workarounds that address this vulnerability.

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Fixed Software

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• For information about fixed software releases, consult the Cisco bugs identified in the Vulnerable Products section of this advisory.

  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.

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Exploitation and Public Announcements

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• The Cisco Product Security Incident Response Team (PSIRT) is aware that a proof-of-concept is available that demonstrates that this vulnerability can be used to cause a buffer overflow and subsequent process termination.

  Additional technical information is also available that describes this vulnerability in detail.

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

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Source

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• Cisco would like to thank Simon Scannell for reporting this vulnerability.

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Cisco Security Vulnerability Policy

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• 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.

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Related to This Advisory

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URL

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Revision History

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• Version

  Description

  Section

  Status

  Date

  1.4

  Updated proof-of-concept information.

  Exploitation and Public Announcements

  Final

  2023-FEB-22

  1.3

  Clarified the vulnerability impacts based on platform. Updated the link to the ClamAV blog.

  Summary

  Final

  2023-FEB-21

  1.2

  Added two more fixed releases and availability dates for Secure Web Appliance.

  Vulnerable Products

  Final

  2023-FEB-17

  1.1

  Changed date of ClamAV disclosure to February 15.

  Summary

  Final

  2023-FEB-15

  1.0

  Initial public release.

  -

  Final

  2023-FEB-15

  Show Less

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