Rule:

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Sid:
1903

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Summary:
This event is generated when a remote attacker sends an IMAP RENAME
command with a malformed argument to an internal IMAP server port. This
may indicate an attempt to exploit a buffer overflow vulnerability in
the IMAP RENAME command.

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Impact:
Possible shell access on the IMAP server, leading to arbitrary code
execution. The attacker must have a valid IMAP account on the mail
server to attempt this exploit.

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Detailed Information:
When a RENAME command with a malformed and overly long argument is sent
to a vulnerable IMAP server, a buffer overflow condition may occur. This
can allow an attacker to execute arbitrary code from the command shell.
Note that this exploit can only be attempted by a user with a valid IMAP
account.

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Affected Systems:
	University of Washington imapd versions 10.234 or 12.264.

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Attack Scenarios:
An attacker with an IMAP account on the server can send a sufficiently
long RENAME command to the IMAP server, creating a buffer overflow
condition. This can then allow the attacker to gain shell access on the
compromised server, possibly leading to the execution of arbitrary code.

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Ease of Attack:
Simple. Exploits exist, but the user must have a valid IMAP account on
the server.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Apply the patch for your current version of imapd appropriate to your
operating system.

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Contributors:
Sourcefire Vulnerability Research Team
Brian Caswell <bmc@sourcefire.com>
Sourcefire Technical Publications Team
Jennifer Harvey <jennifer.harvey@sourcefire.com>

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Additional References:

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