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Rule:
--
Sid:
2106
--
Summary:
This event is generated when a remote user sends an IMAP LSUB command
with invalid data to port 143 on an internal server. This may indicate
an attempt to exploit a buffer overflow vulnerability in the IMAP LSUB
command. This vulnerability may 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.
--
Detailed Information:
When a large amount of data is sent to a vulnerable IMAP server in the
LSUB 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.
--
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 sufficiently
long LSUB 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.
--
Ease of Attack:
Simple. Exploits exist, but the user must have a valid IMAP account on
the 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 Vulneratility Research Team
Brian Caswell <bmc@sourcefire.com>
Sourcefire Technical Publications Team
Jen Harvey <jennifer.harvey@sourcefire.com>
--
Additional References:
Bugtraq
http://www.securityfocus.com/bid/1110
CVE
http://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=CVE-2000-0284
Nessus
http://cgi.nessus.org/plugins/dump.php3?id=10374
--
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