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Rule:
--
Sid:
115-3
--
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.
--
Impact:
Unknown.
--
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.
--
Affected Systems:
All.
--
Attack Scenarios:
--
Ease of Attack:
Simple.
--
False Positives:
None Known.
--
False Negatives:
None Known.
--
Corrective Action:
Check the target host for signs of compromise.
Apply any appropriate vendor supplied patches.
--
Contributors:
Sourcefire Vulnerability Research Team
Daniel Roelker <droelker@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
--
Additional References:
ASN1 Information Site:
http://asn1.elibel.tm.fr/
--
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