Rule:

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Sid:
3133

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Summary:
This event is generated when an attempt is made to exploit a buffer overflow
associated with the processing of a Portable Network Graphics (PNG) file by
the GD Graphics Library.

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Impact:
A successful attack may cause a denial of service or a buffer overflow and the
subsequent execution of arbitrary code on a vulnerable server.

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Detailed Information:
A vulnerability exists in the way that software that handles PNG files,
libpng, allocates memory for PNG images. A maliciously formatted PNG
image sent to a vulnerable server may cause a buffer overflow and the
subsequent execution of arbitrary code on a vulnerable server.  A
PNG file with an excessively large image height, width, or depth, or
combination of these can cause a buffer overflow.

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Affected Systems:
	GD Graphics Library 2.0.28 and earlier

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Attack Scenarios:
An attacker can create a malformed PNG file and upload it to a web server,
possibly causing a buffer overflow.

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Ease of Attack:
Simple.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

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Contributors:
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

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