

Rule:

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Sid:
115-3

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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 oversized
item, indicating a possible overflow attempt 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 may indicate an attempt to overflow a fixed length buffer in an
application using the asn1 libraries.

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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