Rule:

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Sid:
1938

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Summary:
This event is generated when an attempt is made to exploit a buffer
overflow condition in the Post Office Protocol (POP) command XTND.

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Impact:
Possible remote execution of arbitrary code leading to a remote root 
compromise.

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Detailed Information:
A vulnerability exists such that an attacker may overflow a buffer by 
sending a large number of non-line feed characters before a line feed
to a POP server via the XTND command.

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Attack Scenarios:
Simple. An attacker can supply many consecutive non-newline characters to
the XTND function on a POP server to cause the overflow condition. 

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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:
Upgrade to the latest non-affected version of the software.

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

RFC 1082:
http://www.faqs.org/rfcs/rfc1082.html

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