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TITLE:
libpng Unknown Chunk Processing Uninitialized Memory Access

SECUNIA ADVISORY ID:
SA29792

VERIFY ADVISORY:
http://secunia.com/advisories/29792/

CRITICAL:
Moderately critical

IMPACT:
Exposure of sensitive information, DoS, System access

WHERE:
>From remote

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

DESCRIPTION:
Tavis Ormandy has reported a vulnerability in libpng, which can be
exploited by malicious people to cause a DoS (Denial of Service),
disclose potentially sensitive information, or potentially compromise
an application using the library.

The vulnerability is caused due to the improper handling of PNG
chunks unknown to the library. This can be exploited to trigger the
use of uninitialized memory in e.g. a "free()" call via unknown PNG
chunks having a length of zero.

Successful exploitation may allow execution of arbitrary code, but
requires that the application calls the
"png_set_read_user_chunk_fn()" function or the
"png_set_keep_unknown_chunks()" function under specific conditions. 

The vulnerability is reported in versions 1.0.6 through 1.0.32 and
1.2.0 through 1.2.26.

SOLUTION:
Fixed in version 1.2.27beta01.

Do not process untrusted PNG data with applications using libpng.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy, oCERT Team.

ORIGINAL ADVISORY:
libpng:
http://libpng.sourceforge.net/Advisory-1.2.26.txt

oCERT:
http://www.ocert.org/advisories/ocert-2008-003.html

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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.

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