Cisco Security Advisory
ClamAV HFS+ File Scanning Infinite Loop Denial of Service Vulnerability
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in the filesystem image parser for Hierarchical File System Plus (HFS+) 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 completion when a file is decompressed, which may result in a loop condition that could cause the affected software to stop responding. An attacker could exploit this vulnerability by submitting a crafted HFS+ filesystem image to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to stop responding, 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-rNwNEEee
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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.
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 Linux 5.3 Medium CSCwf39307 1.20.5.955
1.22.0Secure Endpoint Connector for MacOS 5.3 Medium CSCwf39308 1.22.0 Secure Endpoint Connector for Windows 7.5 High CSCwf39309 7.5.13.21586
8.1.7.21585Secure Endpoint Private Cloud 7.5 High CSCwf39310 3.8.0 or later with updated connectors Cisco products may be impacted differently depending on implementation and usage of ClamAV. For information the effects of this vulnerability on specific Cisco products, see the Details section.
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 Software
- Secure Email Appliance, formerly Email Security Appliance
- 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.
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Details about the potential effects of the vulnerability on each platform are as follows:
Impacts of ClamAV DoS Vulnerability on Windows Platforms
The Security Impact Rating (SIR) for this vulnerability is High only for 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.
A vulnerability in the HFS+ filesystem image parser of ClamAV 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): CSCwf39309
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:HImpacts of ClamAV DoS Vulnerability on Linux and MacOS Platforms
The SIR for this vulnerability is Medium on Linux and Mac platforms because those platforms run the ClamAV scanning process in a separate, lower-privileged security context. See the Assessing Security Risk section of the Cisco Security Vulnerability Policy for information about vulnerability scoring and SIRs.
A vulnerability in the HFS+ filesystem image parser of ClamAV could allow an attacker to cause Cisco Secure Endpoint Connector for Linux or MacOS to become unresponsive and recover on its own, with limited impact to application functionality. Cisco Secure Endpoint Connector for Linux and Secure Endpoint Connector for MacOS, which are distributed from Cisco Secure Endpoint Private Cloud, are affected by this vulnerability.
Bug ID(s): CSCwf39307, CSCwf39308
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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There are no workarounds that address this vulnerability.
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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.
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 Linux 1.20.5.9551
1.22.01Secure Endpoint Connector for MacOS 1.22.01 Secure Endpoint Connector for Windows 7.5.13.215861
8.1.7.215851Secure Endpoint Private Cloud 3.8.0 or later 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.
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The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerability that is described in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank Steve Smith for reporting this vulnerability.
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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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Show LessVersion Description Section Status Date 1.1 Updated the fix information for Secure Endpoint for Linux. Vulnerable Products and Fixed Releases Final 2023-AUG-25 1.0 Initial public release. - Final 2023-AUG-16
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