2119.txt

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Rule:

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Sid:
2119

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Summary:
This event is generated when a remote user uses the IMAP RENAME command
to send a suspiciously long string to port 143 on an internal server.
This may indicate an attempt to exploit a buffer overflow vulnerability
in the IMAP RENAME command. This may also affect other IMAP implementations.

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 large amount of data is sent to a vulnerable IMAP server in the
RENAME command, a buffer overflow condition may occur. This can allow
the attacker to access the shell, where arbitrary code can be executed.
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:
Upgrade to the latest non-affected version of the software.

Apply the appropriate patches for your operating system.

Check the host for signs of compromise.

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Contributors:
Sourcefire Vulnerability Research Team
Brian Caswell <[e-mail]>
Sourcefire Technical Publications Team
Jen Harvey <[e-mail]>

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Additional References:

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