TITLE:
NetPBM "pnmtopng" Stack Corruption Vulnerability

SECUNIA ADVISORY ID:
SA17221

VERIFY ADVISORY:
http://secunia.com/advisories/17221/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
NetPBM 10.x
http://secunia.com/product/1199/

DESCRIPTION:
Bastien Nocera has reported a vulnerability in NetPBM, which
potentially can be exploited by malicious people to cause a DoS
(Denial of Service) or compromise a user's system.

The vulnerability is caused due to the use of uninitialised variables
by "pnmtopng" in the "closestColorInPalette()" function. This may be
exploited to cause stack corruption and may allow arbitrary code
execution when processing a malicious ".pnm" file.

The vulnerability has been reported in version 10.25. Other versions
may also be affected.

SOLUTION:
Only use pnmtopng on trusted files.

PROVIDED AND/OR DISCOVERED BY:
Bastien Nocera

ORIGINAL ADVISORY:
Red Hat:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=168278

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