3689.txt

来自「This is the snapshot of Snot Latest Rule」· 文本 代码 · 共 67 行

Rule:

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Sid:
3689

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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
Internet Explorer.

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Impact:
A successful attack may cause a buffer overflow and the subsequent execution
of arbitrary code on a vulnerable client host.

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Detailed Information:
A vulnerability exists in the way Internet Explorer handles the
transparency chunk of a PNG file, enabling a buffer overflow and the
subsequent execution of arbitrary code on a vulnerable client.  A PNG
datastream consists of a PNG marker followed by a sequence of chunks
that have a specific format and function.

WARNING
Setting flow_depth 0 will cause performance problems in some situations.
WARNING

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Affected Systems:
	Internet Explorer 6 SP1 and prior
	Internet Explorer 5.5 SP2 and prior

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Attack Scenarios:
An attacker can create a malformed PNG file on a web server, entice a user
to download it, possibly causing a buffer overflow on a vulnerable client.

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Ease of Attack:
Simple. Exploit code exists.

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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.

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Contributors:
Sourcefire Vulnerability Research Team
Judy Novak <[e-mail]>
Brian Caswell <[e-mail]>

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Additional References


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