Summary

• A vulnerability in the OLE2 file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  This vulnerability is due to an incorrect check for end-of-string values during scanning, which may result in a heap buffer over-read. An attacker could exploit this vulnerability by submitting a crafted file containing OLE2 content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software and consuming available system resources.

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

  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-clamav-hDffu6t

Affected Products

• The Vulnerable Products section of this advisory 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.

  Vulnerable Products

  The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. Customers should refer to the associated Cisco bug IDs for further details.

  Affected Cisco Software Platform	CVSS Base Score	Security Impact Rating	Cisco Bug ID	First Fixed Release
  Secure Endpoint Connector for Windows	7.5	High	CSCwh88483	7.5.17 (Feb 2024) 8.2.3.30119
  Secure Endpoint Private Cloud	7.5	High	CSCwh88484	3.8.0 with updated connectors

  Cisco products may be impacted differently depending on implementation and usage of ClamAV. For information on the effects of this vulnerability on specific Cisco products, see the Details 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 Threat Defense (FTD) Software
  • Secure Email Gateway, formerly Email Security Appliance (ESA)
  • Secure Endpoint Connector for Linux
  • Secure Endpoint Connector for Mac
  • Secure Web Appliance

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

Details

• Impacts of ClamAV DoS Vulnerability on Windows Platforms

  This vulnerability, which has a High Security Impact Rating (SIR), affects only Windows-based platforms because those platforms run the ClamAV scanning process as a service that could enter a loop condition, which would consume available CPU resources and delay or prevent further scanning operations. See the Assessing Security Risk section of the Cisco Security Vulnerability Policy for information about vulnerability scoring and SIRs.

  This vulnerability could allow an attacker to cause Cisco Secure Endpoint Connector for Windows to enter a loop and stop responding, resulting in a DoS condition. Cisco Secure Endpoint Connector for Windows, which is distributed from Cisco Secure Endpoint Private Cloud, is affected by this vulnerability.

  Bug ID(s): CSCwh88483
  Security Impact Rating (SIR): High
  CVSS Base Score: 7.5
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• 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.

  Fixed Releases

  Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table:

  Affected Cisco Software Platform	First Fixed Release
  Secure Endpoint Connector for Windows	7.5.17 (Feb 2024)1 8.2.3.301191
  Secure Endpoint Private Cloud	3.8.0 with updated connectors2

  1. Updated releases of Cisco Secure Endpoint Connector are available through the Cisco Secure Endpoint portal. Depending on the configured policy, Cisco Secure Endpoint Connector will automatically update.

  2. Affected releases of Cisco Secure Endpoint Connector 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.

  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 Google OSS-Fuzz for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-hDffu6t

Revision History

• Version	Description	Section	Status	Date
  1.1	Updated fixed software release information.	Vulnerable Products and Fixed Releases	Final	2024-FEB-13
  1.0	Initial public release.	—	Final	2024-FEB-07

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