Sophos Anti-Virus 4.61.0 CAB File Parser access control

Summaryinfo

A vulnerability identified as critical has been detected in Sophos Anti-Virus 4.61.0. This impacts an unknown function of the component CAB File Parser. The manipulation leads to access control. This vulnerability is uniquely identified as CVE-2012-1450. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Sophos Anti-Virus 4.61.0 (Anti-Malware Software) and classified as critical. This issue affects some unknown functionality of the component CAB File Parser. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is integrity. The summary by CVE is:

The CAB file parser in Emsisoft Anti-Malware 5.1.0.1, Sophos Anti-Virus 4.61.0, and Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0 allows remote attackers to bypass malware detection via a CAB file with a modified reserved3 field. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different CAB parser implementations.

The weakness was disclosed 03/19/2012 by Suman Jana and Vitaly Shmatikov as not defined mailinglist post (Bugtraq). The advisory is shared at seclists.org. The public release happened without involvement of Sophos. The identification of this vulnerability is CVE-2012-1450 since 02/29/2012. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

A public exploit has been developed by Suman Jana / Vitaly Shmatikov and been published immediately after the advisory. The exploit is available 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 SecurityFocus (BID 52617†) and OSVDB (80481†). The entries VDB-4914, VDB-4915, VDB-4916 and VDB-4917 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Anti-Malware Software

Vendor

• Sophos

Name

• Anti-Virus

Version

• 4.61.0

License

• commercial

Website

• Vendor: https://www.sophos.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion