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LessTif "DEBUG_FILE" Privilege Escalation Vulnerability
Secunia Advisory: SA21428
Release Date: 2006-08-09
Last Update: 2006-08-18
Popularity: 5,594 views

Critical:
Less critical
Impact: Privilege escalation
Where: Local system
Solution Status: Unpatched

Software:LessTif 0.x

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CVE reference:CVE-2006-4124


Description:
Karol Wiesek has reported a vulnerability in LessTif, which can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to the libXm library allowing users to specify a file for writing debug output to via the "DEBUG_FILE" environment variable. By running a setuid binary linked against a vulnerable libXm library, this can be exploited to create world-writable files with the effective user id of the binary.

Solution:
Restrict permission to execute setuid binaries linked against libXm to trusted users only.

Provided and/or discovered by:
Karol Wiesek

Changelog:
2006-08-18: Added CVE reference.

Original Advisory:
http://karol.wiesek.pl/files/lesstif-advisory.pdf


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