TITLE:
Mercur Messaging IMAP Service Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA19267

VERIFY ADVISORY:
http://secunia.com/advisories/19267/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Mercur Messaging 2005
http://secunia.com/product/5035/

DESCRIPTION:
Tim Taylor has discovered a vulnerability in Mercur Messaging 2005,
which can be exploited by malicious people and by malicious users to
cause a DoS (Denial of Service) or to compromise a vulnerable
system.

The vulnerability is caused due to boundary errors within the
handling of IMAP commands. This can be exploited to cause a
stack-based buffer overflow via overly long arguments passed to the
LOGIN and SELECT commands. Other commands may also be affected.

Successful exploitation allows arbitrary code execution.

The vulnerability has been confirmed in version 5.0 SP3. Other
versions may also be affected.

SOLUTION:
Filter potentially malicious IMAP requests using a firewall.

PROVIDED AND/OR DISCOVERED BY:
Tim Taylor

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/043972.html

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