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Flex Generated C Parsers Buffer Overflow Vulnerability
Secunia Advisory: SA19071
Release Date: 2006-03-01
Last Update: 2006-03-08
Popularity: 7,096 views

Critical:
Moderately critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

Software:Fast Lexical Analyzer Generator (Flex) 2.x

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CVE reference:CVE-2006-0459


Description:
A vulnerability has been reported in Flex, which potentially can be exploited by malicious people to compromise a user's system.

The vulnerability is caused to a boundary error in "flex.skl". This can potentially be exploited to cause a buffer overflow in generated C parsers that use REJECT or "trailing context" rules, when processing specially crafted user-supplied input.

The vulnerability has been reported in versions prior to 2.5.33.

Solution:
Update to version 2.5.33.
http://flex.sourceforge.net/

Provided and/or discovered by:
Reported by vendor.

Changelog:
2006-03-08: Updated "Title" and "Description" sections.

Original Advisory:
http://archives.neohapsis.com/archives/apps/freshmeat/2006-02/0022.html


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