Clam AntiVirus CHM unpacker denial of service

clamav-chm-dos (29608) The risk level is classified as LowLow Risk

Description:

Clam AntiVirus is vulnerable to a denial of service, caused by an unspecified vulnerability in chmunpack.c, the CHM unpacker. By sending a specially-crafted CHM file through the scanning engine, a remote attacker could cause the affected application to crash when the malicious file is processed.

*CVSS:

Base Score: 3.5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 2.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Clam AntiVirus (0.88.5 or later), available from SourceForge.net. See References.

For Debian GNU/Linux:
Refer to DSA-1196-1 for patch, upgrade, or suggested workaround information. See References.

For SUSE Linux:
Refer to SUSE-SA:2006:060 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • iDefense Labs PUBLIC ADVISORY: 10.15.06: Clam AntiVirus ClamAV CHM Chunk Name Length DoS Vulnerability.
  • SourceForge.net: Files: Clam AntiVirus - File Release Notes and Changelog - Release Name: 0.88.5.
  • BID-20537: Clam Anti-Virus CHM Unpacker Denial Of Service Vulnerability
  • CVE-2006-5295: Unspecified vulnerability in ClamAV before 0.88.5 allows remote attackers to cause a denial of service (scanning service crash) via a crafted Compressed HTML Help (CHM) file that causes ClamAV to read an invalid memory location.
  • DSA-1196: clamav -- several vulnerabilities
  • MDKSA-2006:184: Updated clamav packages fix vulnerabilities
  • SA22370: Clam AntiVirus CHM Unpacker and PE Rebuilding Vulnerabilities
  • SA22488: Kolab Server ClamAV CHM Unpacker and PE Rebuilding Vulnerabilities
  • SA22626: SnapGear Multiple Vulnerabilities
  • SECTRACK ID: 1017068: Clam AntiVirus PE File Heap Overflow Lets Remote Users Execute Arbitrary Code
  • SUSE-SA:2006:060: clamav security problems
  • VUPEN/ADV-2006-4034: Clam AntiVirus PE Rebuilding and CHM Unpacker Code Execution and DoS Issues
  • VUPEN/ADV-2006-4136: Kolab Server ClamAV Integer Overflow and Denial of Service Vulnerabilities
  • VUPEN/ADV-2006-4264: SnapGear Security Update Fixes Multiple OpenSSL and ClamAV Vulnerabilities

Platforms Affected:

  • Clam Anti-Virus ClamAV 0.88.4 and prior
  • Debian Debian Linux 3.1
  • MandrakeSoft Mandrake Linux 2006
  • MandrakeSoft Mandrake Linux 2006 X86_64
  • MandrakeSoft Mandrake Linux 2007 X86_64
  • MandrakeSoft Mandrake Linux 2007
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell Open Enterprise Server
  • SuSE SuSE SLES 10
  • SuSE SuSE SLES 9

Reported:

Oct 15, 2006

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For corrections or additions please email xforce@iss.net

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