3470.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:

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Sid:
3470

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Summary:
This event is generated when an attempt is made to exploit a
buffer overflow associated with RealPlayer.

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Impact:
A successful attack can cause a buffer overflow of the client
host and the subsequent execution of arbitrary code at the
privilege of the current user.

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Detailed Information:
The RealPlayer media player is prone to a buffer overflow vulnerability
when handling oversize lengths in the VIDORV30 Media Properties header
field. A fixed-sized buffer is allocated for the value supplied to this
attribute, however there is no check to ensure that the supplied value
fits in the allocated buffer. A buffer overflow occurs when the length
of the supplied value is greater than the fixed-size buffer.

In order to avoid potential evasion techniques, http_inspect
should be configured with "flow_depth 0" so that all HTTP
server response traffic is inspected.

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

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Affected Systems:
	Multiple versions of RealPlayer prior to and including 10.5 on
	multiple platforms.

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Attack Scenarios:
An attacker can entice a user to download and play a malicious
media file, causing a buffer overflow on a vulnerable client.

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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 most current non-affected version of the product.

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Contributors:
Sourcefire Research Team
Alex Kirk <[e-mail]>
Nigel Houghton <[e-mail]>
Judy Novak <[e-mail]>

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Additional References:

Real Networks advisory:
http://www.service.real.com/help/faq/security/040928_player/EN/

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