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Mercury Mail Transport System SMTP AUTH CRAM-MD5 Buffer Overflow Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA26519  
Release Date: 2007-08-20
Last Update: 2007-08-28

Critical:
Highly critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

Software:Mercury Mail Transport System 4.x

CVE reference:CVE-2007-4440 (Secunia mirror)

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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:
Update to version 4.52.
http://www.pmail.com/downloads.htm

Provided and/or discovered by:
eliteb0y

Changelog:
2007-08-22: Added CVE reference.
2007-08-28: Updated "Solution" section. Added vendor link.

Original Advisory:
Mercury:
http://www.pmail.com/m32_451.htm

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



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

5 Related Secunia Security Advisories

1. Mercury Mail Transport System IMAPD SEARCH Buffer Overflow
2. Mercury Mail Transport System IMAP Data Handling Buffer Overflow
3. Mercury Mail Transport System Unspecified Buffer Overflow
4. Mercury Mail Transport System Buffer Overflow
5. Mercury Mail Transport System Command Handling Buffer Overflows


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