119-6.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: 
119-6

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Summary: 
This event is generated when the pre-processor http_inspect
detects network traffic that may constitute an attack.

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Impact: 
Unknown. This may be an attempt to evade an IDS.

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Detailed Information:
This event is generated when the pre-processor http_inspect detects a
web request that is using UTF-8 encoding. This may indicate an attempt
to evade an IDS by obfuscating the request using UTF-8.

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Affected Systems:
	All web servers.

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Attack Scenarios: 
An attacker merely needs to encode the request using UTF-8 encoding.

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Ease of Attack: 
Simple.

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False Positives:
This may be legitimate behavior. Web clients may use this encoding.

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False Negatives:
None Known.

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Corrective Action:
Check the target host for signs of compromise.

Apply any appropriate vendor supplied patches.

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Contributors:
Daniel Roelker <[e-mail]> 
Sourcefire Vulnerability Research Team
Nigel Houghton <[e-mail]>

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Additional References:

HTTP IDS Evasions Revisited - Daniel Roelker
http://docs.idsresearch.org/http_ids_evasions.pdf

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