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Rule:
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Sid:
2107
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Summary:
This event is generated when a remote user uses invalid data within an IMAP CREATE command sent to port 143 on an internal server. This may indicate an attempt to exploit a buffer overflow vulnerability in the IMAP CREATE command in the Alt-N MDaemon IMAP server.
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Impact:
Remote execution of arbitrary code, which could allow an attacker to interfere with or crash mail services. The attacker must have a valid IMAP account and be authenticated by the mail server to attempt this exploit.
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Detailed Information:
Some versions of the Alt-N MDaemon IMAP server contain a vulnerability where, if an authenticated user creates a folder with a sufficiently long name, arbitrary code can be executed with system privileges. Note that this exploit can only be attempted by an authenticated user with a valid IMAP account on the mail server.
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Affected Systems:
Any operating system that runs Alt-N MDaemon 6.7.5 or Alt-N MDaemon 6.7.9 IMAP servers.
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Attack Scenarios:
An authenticated user can create a new folder with a sufficiently long name, creating a buffer overflow condition. The attacker can then execute arbitrary code with system privileges, which may allow the attacker to interfere with or crash mail services.
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Ease of Attack:
Exploits exist, but the user must be authenticated before attempting the exploit.
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False Positives:
None known.
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False Negatives:
None known.
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Corrective Action:
Upgrade to Alt-N MDaemon 6.7.10 or later.
Check the host for signs of compromise.
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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Sourcefire Technical Publications Team
Jen Harvey <jennifer.harvey@sourcefire.com>
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Additional References:
Bugtraq
http://www.securityfocus.com/bid/7446
Nessus
http://cgi.nessus.org/plugins/dump.php3?id=11577
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