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TITLE:
libpng "png_push_read_zTXt()" Off-By-One Vulnerability

SECUNIA ADVISORY ID:
SA31781

VERIFY ADVISORY:
http://secunia.com/advisories/31781/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
libpng 1.x
http://secunia.com/product/3439/

DESCRIPTION:
A vulnerability has been reported in libpng, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an off-by-one error within the
"png_push_read_zTXt()" function in pngread.c when processing
malicious PNG images with specially crafted zTXt chunks, which can be
exploited to crash an application using the library.

The vulnerability was reportedly introduced in version 1.2.30beta04
and is reported in version 1.2.31. Other versions may also be
affected.

Note: An off-by-one error in pngtest.c was also fixed.

SOLUTION:
Fixed in version 1.2.32beta01.

PROVIDED AND/OR DISCOVERED BY:
Harald van Dijk

ORIGINAL ADVISORY:
http://sourceforge.net/project/shownotes.php?release_id=624518

http://sourceforge.net/tracker/index.php?func=detail&aid=2095669&group_id=5624&atid=105624

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