Rule:

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Sid:
2664

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Summary:
This event is generated when a remote attacker attempts to exploit a 
format string vulnerability against an IMAP server.

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Impact:
Serious. A successful format string attack could result in the
execution of arbitrary code with the same privileges as the user running
the IMAP daemon.

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Detailed Information:
Some versions of the Courier IMAP daemon are vulnerable to format string
exploits prior to and during authentication to the IMAP server.  A
successful exploit attempt could result in the remote attacker gaining
unauthorized root access to a vulnerable system.

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Affected Systems:
	Courier IMAP server versions 1.6 though 3.0.2

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Attack Scenarios:
A remote attacker could use a publicly available script to exploit the 
vulnerability an gain control of the target host.

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Ease of Attack:
Simple. Exploit code is available.

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False Positives:
This rule may generate an event if the password for a valid user contains 
the character "%".

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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 Vulnerability Research Team
Matt Watchinski <mwatchinski@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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