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AUSCERT External Security Bulletin Redistribution
ESB-2022.2038.2
ClamAV CHM File Parsing Denial of Service Vulnerability
Affecting Cisco Products: May 2022
16 December 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Secure Endpoint
Publisher: Cisco Systems
Operating System: Cisco
Windows
macOS
Linux variants
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20770
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-dos-prVGcHLd
Comment: CVSS (Max): 8.6 CVE-2022-20770 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Revision History: December 16 2022: Vendor Update
May 5 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ClamAV CHM File Parsing Denial of Service Vulnerability Affecting Cisco
Products: May 2022
Priority: Medium
Advisory ID: cisco-sa-clamav-dos-prVGcHLd
First Published: 2022 May 4 16:00 GMT
Last Updated: 2022 December 14 18:46 GMT
Version 1.2: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwa95108 CSCwa95109 CSCwa95110
CVE Names: CVE-2022-20770
CWEs: CWE-399
Summary
o On May 4, 2022, the following vulnerability in the ClamAV scanning library
versions 0.103.5 and earlier and 0.104.2 and earlier was disclosed:
A vulnerability in CHM file parser of Clam AntiVirus (ClamAV) versions
0.104.0 through 0.104.2 and LTS version 0.103.5 and prior versions
could allow an unauthenticated, remote attacker to cause a denial of
service condition on an affected device.
For a description of this vulnerability, see the ClamAV blog .
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-dos-prVGcHLd
Affected Products
o 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.
Vulnerable Products
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. If no version or date is listed for an
affected component (indicated by a blank field and/or an advisory
designation of Interim), Cisco is continuing to evaluate the fix and will
update the advisory as additional information becomes available. After the
advisory is marked Final, customers should refer to the associated Cisco
bug(s) for further details.
Cisco Product Cisco Bug Fixed Release
ID Availability
Secure Endpoint, formerly Advanced Malware CSCwa95108 1.17.2
Protection (AMP) for Endpoints, for Linux 1.18.0
Secure Endpoint, formerly AMP for Endpoints, for CSCwa95109 1.16.3
MacOS 1.18.0
Secure Endpoint, formerly AMP for Endpoints, for CSCwa95110 7.5.5
Windows
Attention : Simplifying the Cisco portfolio includes the renaming of
security products under one brand: Cisco Secure. For more information, see
Meet Cisco Secure .
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 the following Cisco products that include a
version of the ClamAV library are not affected by this vulnerability:
Email Security Appliance
Firepower Threat Defense (FTD) Software
Secure Email and Web Manager, formerly Security Management Appliance
Web Security Appliance
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o 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.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Michal Dardas for reporting this vulnerability.
Cisco Security Vulnerability Policy
o 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.
Related to This Advisory
o
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-dos-prVGcHLd
Revision History
o +---------+----------------------------+----------+---------+-------------+
| Version | Description | Section | Status | Date |
+---------+----------------------------+----------+---------+-------------+
| | Removed references to an | Summary, | | |
| 1.2 | ongoing investigation and | Affected | Final | 2022-DEC-14 |
| | updated the advisory | Products | | |
| | status to Final. | | | |
+---------+----------------------------+----------+---------+-------------+
| | Corrected ClamAV release | Title, | | |
| 1.1 | date and included direct | Summary | Interim | 2022-MAY-04 |
| | link to ClamAV release. | | | |
+---------+----------------------------+----------+---------+-------------+
| 1.0 | Initial public release. | - | Interim | 2022-MAY-04 |
+---------+----------------------------+----------+---------+-------------+
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