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TITLE:
Mercury Mail Transport System SMTP AUTH CRAM-MD5 Buffer Overflow

SECUNIA ADVISORY ID:
SA26519

VERIFY ADVISORY:
http://secunia.com/advisories/26519/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Mercury Mail Transport System 4.x
http://secunia.com/product/4348/

DESCRIPTION:
eliteb0y has discovered a vulnerability in Mercury Mail Transport
System, which can be exploited by malicious people to compromise a
vulnerable system.

The vulnerability is caused due to a boundary error within Mercury/32
SMTP Server Module (mercurys.dll) when processing arguments to the
AUTH CRAM-MD5 command. This can be exploited to cause a stack-based
buffer overflow via an overly long, specially-crafted argument passed
to the affected command.

Successful exploitation allows execution of arbitrary code.

The vulnerability is confirmed in version 4.51. Other versions may
also be affected.

SOLUTION:
Restrict access to the SMTP service.

PROVIDED AND/OR DISCOVERED BY:
eliteb0y

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065357.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
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