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GNU a2ps Command Injection Vulnerability

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Release Date:  2004-08-26    Last Update:  2004-12-10    Views:  9,918

Secunia Advisory SA12375

Where:

Local system

Impact:

Privilege escalation

Solution Status:

Unpatched

Software:

CVE Reference(s):

Description


Rudolf Polzer has discovered a vulnerability in GNU a2ps, which potentially can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to insufficient validation of shell escape characters in filenames and can potentially lead to execution of arbitrary commands.

This can e.g. be exploited when a user is using a wildcard in the filename for a2ps, which matches a filename that a malicious user can control (e.g. in a world-writeable directory).

Another exploit vector is when a2ps is used from within a script or program, which accesses files where the filename can be controlled by a malicious user.

The vulnerability has been confirmed in version 4.13. Other versions may also be affected.


Solution:
Don't use the product on files with untrusted filenames.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Rudolf Polzer

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: GNU a2ps Command Injection Vulnerability

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