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Insecure Library Loading
Moderately critical

libpng Unknown Chunk Processing Uninitialized Memory Access

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Release Date:  2008-04-14    Last Update:  2008-04-29    Views:  13,002

Secunia Advisory SA29792

Where:

From remote

Impact:

Exposure of sensitive information, DoS, System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

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:
Update to version 1.0.33 or 1.2.27.

Further details available to Secunia VIM customers

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: libpng Unknown Chunk Processing Uninitialized Memory Access

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