TITLE:
Pnmtopng "alphas_of_color" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA17544

VERIFY ADVISORY:
http://secunia.com/advisories/17544/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Pnmtopng 2.x
http://secunia.com/product/6111/

DESCRIPTION:
A vulnerability has been reported in pnmtopng, which can be exploited
by malicious people to cause a DoS (Denial of Service) and potentially
to compromise a vulnerable system.

The vulnerability is caused due to a boundary error when writing
RGBA-palette PNG files. This can be exploited to crash pnmtopng and
may allow arbitrary code execution via a specially crafted input file
with exactly 256 colours.

Successful exploitation requires that pnmtopng is used with the
"-alpha" command line, and e.g. pnmtopng is used in a CGI application
that allows remote users to submit image files for processing, or by
tricking a user to use pnmtopng with a malicious ".pnm" file.

The vulnerability has been reported in versions prior to 2.39.

Note: Several potential malloc allocation overflow bugs have also
been fixed.

SOLUTION:
Update to version 2.39.
http://sourceforge.net/project/showfiles.php?group_id=32355&package_id=88579&release_id=370545

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://sourceforge.net/project/shownotes.php?release_id=370545

OTHER REFERENCES:
SA17221:
http://secunia.com/advisories/17221/

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