Sophos Anti-Virus 4.61.0 TAR File Parser access control

Summaryinfo

A vulnerability, which was classified as critical, has been found in Sophos Anti-Virus 4.61.0. This impacts an unknown function of the component TAR File Parser. This manipulation causes access control. This vulnerability is registered as CVE-2012-1424. Furthermore, an exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Sophos Anti-Virus 4.61.0 (Anti-Malware Software). Affected by this vulnerability is an unknown functionality of the component TAR File Parser. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect integrity. The summary by CVE is:

The TAR file parser in Antiy Labs AVL SDK 2.0.3.7, Quick Heal (aka Cat QuickHeal) 11.00, Jiangmin Antivirus 13.0.900, Norman Antivirus 6.06.12, PC Tools AntiVirus 7.0.3.5, and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a POSIX TAR file with a \19\04\00\10 character sequence at a certain location. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different TAR parser implementations.

The weakness was published 03/19/2012 by Suman Jana and Vitaly Shmatikov as confirmed mailinglist post (Bugtraq). It is possible to read the advisory at seclists.org. The vendor was not involved in the public release. This vulnerability is known as CVE-2012-1424 since 02/29/2012. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

A public exploit has been developed by Suman Jana / Vitaly Shmatikov and been published immediately after the advisory. It is possible to download the exploit at seclists.org. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at OSVDB (80390†) and SecurityTracker (ID 1026840†). Similar entries are available at VDB-4914, VDB-4916, VDB-4917 and VDB-4918. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Anti-Malware Software

Vendor

• Sophos

Name

• Anti-Virus

Version

• 4.61.0

License

• commercial

Website

• Vendor: https://www.sophos.com/

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