Rule:--Sid:2119--Summary:This event is generated when a remote user uses the IMAP RENAME commandto send a suspiciously long string to port 143 on an internal server.This may indicate an attempt to exploit a buffer overflow vulnerabilityin the IMAP RENAME command. This may also affect other IMAP implementations.Impact:Possible shell access on the IMAP server, leading to arbitrary codeexecution. The attacker must have a valid IMAP account on the mailserver to attempt this exploit.--Detailed Information:When a large amount of data is sent to a vulnerable IMAP server in theRENAME command, a buffer overflow condition may occur. This can allowthe 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 IMAPaccount.--Affected Systems:	University of Washington imapd versions 10.234 or 12.264. --Attack Scenarios:An attacker with an IMAP account on the server can send a sufficientlylong RENAME command to the IMAP server, creating a buffer overflowcondition. This can then allow the attacker to gain shell access on thecompromised server, possibly leading to the execution of arbitrary code.--Ease of Attack:Simple. Exploits exist, but the user must have a valid IMAP account onthe server.--False Positives:None known.--False Negatives:None known.--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.--Contributors:Sourcefire Vulnerability Research TeamBrian Caswell <bmc@sourcefire.com>Sourcefire Technical Publications TeamJen Harvey <jennifer.harvey@sourcefire.com>--Additional References:--