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TITLE:
CHM Lib "extract_chmLib" Directory Traversal Vulnerability

SECUNIA ADVISORY ID:
SA20734

VERIFY ADVISORY:
http://secunia.com/advisories/20734/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
CHM Lib (chmlib) 0.x
http://secunia.com/product/5996/

DESCRIPTION:
A vulnerability has been reported in CHM Lib (chmlib), which
potentially can be exploited by malicious people to compromise a
user's system.

The vulnerability is caused due to an input validation error in the
"extract_chmLib" example program when extracting files. This makes it
possible to have files extracted to arbitrary writable locations
outside the specified directory using the ".." directory traversal
sequence.

The vulnerability has been reported in version 0.37. Prior versions
may also be affected.

SOLUTION:
Update to version 0.38.
http://morte.jedrea.com/~jedwin/projects/chmlib/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Sven Tantau.

ORIGINAL ADVISORY:
http://morte.jedrea.com/~jedwin/projects/chmlib/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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