

Rule:

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Sid:
115-5

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Summary:
This event is generated when the pre-processor asn1 detects network
traffic that may constitute an attack. Specifically an asn.1 datum
length greater than the packet length was detected.

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Impact:
Unknown.

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Detailed Information:
This event is generated when the asn1 pre-processor detects network
traffic that may consititute an attack.

This indicates that the data length is greater than the packet length
and may indicate an attempt to cause a buffer overflow or it may be an
attempt to evade detection by an IDS that may not correctly process
asn1 data.

More information on this event can be found in the individual
pre-processor documentation README.asn1 in the docs directory of the
snort source. Detailed instructions and examples on how to tune and use
the pre-processor can also be found in the same document.

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Affected Systems:
	All.

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Attack Scenarios:

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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:
Check the target host for signs of compromise.

Apply any appropriate vendor supplied patches.

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Contributors:
Sourcefire Vulnerability Research Team
Daniel Roelker <droelker@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

ASN1 Information Site:
http://asn1.elibel.tm.fr/

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