Rule:

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Sid:
257

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Summary:
This event is generated when an attempt is made to determine the version of BIND being used on a DNS server.

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Impact:
Information gathering. This activity may indicate reconnaisance before an impending attack.

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Detailed Information: 
A remote machine attempted to determine the version of BIND running on a nameserver.

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Affected Systems:
	All DNS nameservers
 
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Attack Scenarios:
As part of reconnaissance leading upto a potential intrusion attempt, an attacker may attempt to determine the BIND version that is in use so that a vulnerable version can be used as an attack vector.

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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:
Disable the ability for untrusted (remote) machines to determine the named version.

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Contributors:
Original rule writer unknown
Snort documentation contributed by Jon Hart <warchild@spoofed.org>
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

OSVDB:
http://www.osvdb.org/23

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