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| GEN:SID | 1:2120 |
| Message | IMAP create literal buffer overflow attempt |
| Summary | This event is generated when a remote user uses the IMAP CREATE 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 CREATE command in the Alt-N MDaemon IMAP server. |
| 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 must be authenticated by the mail server to attempt this exploit. |
| Detailed Information | This event may indicate an attempt to exploit a buffer overflow vulnerability in the Alt-N MDaemon IMAP server CREATE command. If an authenticated user creates a folder with a sufficiently long name on the Alt-N MDaemon IMAP server, arbitrary commands can be executed with system privileges. |
| Affected Systems | Any operating system that runs Alt-N MDaemon 6.7.5 or Alt-N MDaemon 6.7.9 IMAP servers. |
| 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. |
| Ease of Attack | Exploits exist, but the user must have an account and be authenticated before attempting the exploit. |
| Corrective Action | Upgrade to Alt-N MDaemon 6.7.10 or later. |
| Additional References | Bugtraq http://www.securityfocus.com/bid/7446 Nessus http://cgi.nessus.org/plugins/dump.php3?id=11577 |
| Rule References | bugtraq: 7446 |
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DID:876131
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