The Microsoft CHM file parser in ClamAV 0.96.4 and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different CHM parser implementations.

This update addresses possible evasion cases in some archive formats and stability issues in portions of the bytecode engine.

The following issue has been fixed :

  - Viruses contained in specially crafted tar or CHM files     could have evaded detection by clamav. (CVE-2012-1457 /     CVE-2012-1458 / CVE-2012-1459)

USN-1482-1 fixed vulnerabilities in ClamAV. The updated package could fail to properly scan files in some situations. This update fixes the problem.

We apologize for the inconvenience.

It was discovered that ClamAV incorrectly handled certain malformed TAR archives. A remote attacker could create a specially crafted TAR file containing malware that could escape being detected.
(CVE-2012-1457, CVE-2012-1459)

It was discovered that ClamAV incorrectly handled certain malformed CHM files. A remote attacker could create a specially crafted CHM file containing malware that could escape being detected. (CVE-2012-1458).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

. . .

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its version, the ClamAV clamd antivirus daemon on the remote host is earlier than 0.97.5 and is, therefore, potentially affected by the following vulnerabilities :

  - Errors exist related to the 'TAR' file parser that     can allow malware detection to be bypassed when     handling such files containing a length field having     certain values. (CVE-2012-1457, CVE-2012-1459)

  - An error exists related to the 'CHM' file parser that     can allow malware detection to be bypassed when     handling such files containing a crafted reset interval     in the 'LZXC' header. (CVE-2012-1458)

. .

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

USN-1482-1 fixed vulnerabilities in ClamAV. The updated packages could fail to install in certain situations. This update fixes the problem.

We apologize for the inconvenience.

It was discovered that ClamAV incorrectly handled certain malformed TAR archives. A remote attacker could create a specially crafted TAR file containing malware that could escape being detected.
(CVE-2012-1457, CVE-2012-1459)

It was discovered that ClamAV incorrectly handled certain malformed CHM files. A remote attacker could create a specially crafted CHM file containing malware that could escape being detected. (CVE-2012-1458).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that ClamAV incorrectly handled certain malformed TAR archives. A remote attacker could create a specially crafted TAR file containing malware that could escape being detected.
(CVE-2012-1457, CVE-2012-1459)

It was discovered that ClamAV incorrectly handled certain malformed CHM files. A remote attacker could create a specially crafted CHM file containing malware that could escape being detected. (CVE-2012-1458).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

MITRE Advisories report :

The TAR parser allows remote attackers to bypass malware detection via a POSIX TAR file with an initial [aliases] character sequence.

The TAR parser allows remote attackers to bypass malware detection via a TAR archive entry with a length field that exceeds the total TAR file size.

The Microsoft CHM file parser allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file.

The TAR file parser allows remote attackers to bypass malware detection via a TAR archive entry with a length field corresponding to that entire entry, plus part of the header ofxi the next entry.

ID	Name	Product	Family	Severity
74664	openSUSE Security Update : ClamAV (openSUSE-SU-2012:0833-1)	Nessus	SuSE Local Security Checks	medium
64119	SuSE 11.1 Security Update : clamav (SAT Patch Number 6474)	Nessus	SuSE Local Security Checks	medium
61568	Ubuntu 11.04 / 11.10 / 12.04 LTS : clamav regression (USN-1482-3)	Nessus	Ubuntu Local Security Checks	medium
59948	SuSE 10 Security Update : clamav (ZYPP Patch Number 8200)	Nessus	SuSE Local Security Checks	medium
59942	Fedora 16 : clamav-0.97.5-1600.fc16 (2012-9577)	Nessus	Fedora Local Security Checks	medium
59726	ClamAV < 0.97.5 Multiple Vulnerabilities	Nessus	Misc.	medium
59666	Fedora 17 : clamav-0.97.5-1700.fc17 (2012-9563)	Nessus	Fedora Local Security Checks	medium
59605	Ubuntu 11.04 / 11.10 / 12.04 LTS : clamav regression (USN-1482-2)	Nessus	Ubuntu Local Security Checks	medium
59604	Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : clamav vulnerabilities (USN-1482-1)	Nessus	Ubuntu Local Security Checks	medium
59551	FreeBSD : clamav -- multiple vulnerabilities (eb12ebee-b7af-11e1-b5e0-000c299b62e1)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2012-1458

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium