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GD Graphics Library Truncated PNG Data Denial of Service Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA25362  
Release Date: 2007-05-22

Critical:
Less critical
Impact: DoS
Where: From remote
Solution Status: Vendor Workaround

Software:GD Graphics Library 2.x

CVE reference:CVE-2007-2756 (Secunia mirror)



Description:
Xavier Roche has reported a vulnerability in GD Graphics Library, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the incorrect use of libpng within the function "gdPngReadData()" when processing truncated data. This can be exploited to cause an infinite loop by e.g. tricking an application using the library to process a specially crafted file.

The vulnerability is reported in version 2.0.34. Other versions may also be affected.

Solution:
Apply patch.
http://bugs.libgd.org/?getfile=118

Provided and/or discovered by:
Xavier Roche

Original Advisory:
http://bugs.libgd.org/?do=details&task_id=86



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

5 Related Secunia Security Advisories

1. GD Graphics Library Multiple Vulnerabilities
2. GD Graphics Library "gdImageStringFTEx()" Denial of Service
3. GD Graphics Library GIF File Handling Denial of Service
4. GD Graphics Library Unspecified Buffer Overflow Vulnerabilities
5. GD Graphics Library "gdImageCreateFromPngCtx()" Integer Overflow


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