Cobalt RaQ3 poprelayd allows mail relay using SMTP

cobalt-poprelayd-mail-relay (6806) The risk level is classified as MediumMedium Risk

Description:

Cobalt RaQ3 Server could allow a remote attacker to perform mail relaying on the system, caused by a vulnerability in the poprelayd daemon. The poprelayd daemon fails to properly check the /var/log/maillog file output. This allows a remote attacker to create a specially-crafted string in the log file to perform mail relaying while using the SMTP server.

Platforms Affected:

  • Sun, Cobalt RaQ 3

Remedy:

Update poprelayd to the latest version, or at least apply Poprelayd 2.0-5 Update 4.0.1 (RaQ3-All-Security-4.0.1-10628.pkg) as described on the Sun Cobalt RaQ3 Downloads page. See References.

Sun Cobalt has also made experimental patches available for poprelayd-2.0-4, which can be applied to /usr/local/sbin/poprelayd to correct the relay exploit. See References.

Consequences:

Bypass Security

References:

  • BugTraq Mailing List, Mon Jul 09 2001 - 14:03:06 CDT, Re: poprelayd and sendmail relay authentication problem (Cobalt Raq3) at http://archives.neohapsis.com/archives/bugtraq/2001-07/0150.html.
  • BugTraq Mailing List, Tue Jul 03 2001 - 12:05:10 CDT, poprelayd and sendmail relay authentication problem (Cobalt Raq3) at http://archives.neohapsis.com/archives/bugtraq/2001-07/0064.html.
  • BID-2986: Cobalt Raq3 PopRelayD Arbitrary SMTP Relay Vulnerability
  • CVE-1999-0512: A mail server is explicitly configured to allow SMTP mail relay, which allows abuse by spammers.
  • CVE-2001-1075: poprelayd script before 2.0 in Cobalt RaQ3 servers allows remote attackers to bypass authentication for relaying by causing a POP login by user string that includes the attacker's IP address to be injected into the maillog log file.

Reported:

Jul 03, 2001

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