Check Point Advisories

Alt-N MDaemon POP3 Server USER and APOP Commands Buffer Overflow (CVE-2006-4364)

Check Point Reference: CPAI-2006-239
Date Published: 8 Nov 2009
Severity: Critical
Last Updated: Sunday 08 November, 2009
Source:
Industry Reference:CVE-2006-4364
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Alt-N MDaemon is an email server product that supports a rich set of message exchanging protocols. The Post Office Protocol version 3 (POP3) allows for the retrieving of electronic mail over a TCP/IP connection. The MDaemon POP3 server is a server side implementation of the protocol. The default communication port of POP3 is TCP/110. There exists a buffer overflow vulnerability in the Alt-N MDaemon POP3 server product. An unauthenticated attacker may trigger this flaw by sending crafted POP3 messages to the affected product. A successful attack may execute arbitrary code with SYSTEM level privileges on the target host. In a simple attack case aimed at creating a denial of service condition, the affected MDaemon process and all supported services, including IMAP, SMTP and so on, will terminate. If MDaemon is not configured to restart automatically, the services will be unavailable until the process is restarted manually. In a sophisticated attack scenario where the attacker is successful in injecting and executing supplied code, the behaviour of the system is dependent on the nature the injected code. Any code injected into the vulnerable component would execute in the security context of the service process, normally System.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Alt-N MDaemon POP3 Server USER and APOP Commands Buffer Overflow protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  POP3 Protocol Violation.
Attack Information:  Alt-N MDaemon POP3 server USER and APOP commands buffer overflow

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