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TITLE:
Courier Mail Server Username Encoding Denial of Service

SECUNIA ADVISORY ID:
SA20519

VERIFY ADVISORY:
http://secunia.com/advisories/20519/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Courier Mail Server 0.x
http://secunia.com/product/2557/

DESCRIPTION:
A vulnerability has been reported in Courier Mail Server, which
potentially can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error within the encoding of
usernames that contain the "=" character. This can potentially be
exploited to cause a DoS by consuming large amount of CPU resources.

The vulnerability has been reported in versions prior to 0.53.2.

SOLUTION:
Update to version 0.53.2 or apply patch.
http://www.courier-mta.org/?download.php

Patch:
http://www.courier-mta.org/beta/patches/verp-fix/verp.patch.txt

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://www.courier-mta.org/beta/patches/verp-fix/README.txt
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=368834

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