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TITLE:
CMailServer POP3 Class ActiveX Control Buffer Overflow

SECUNIA ADVISORY ID:
SA30940

VERIFY ADVISORY:
http://secunia.com/advisories/30940/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
CMailServer 5.x
http://secunia.com/product/4322/

DESCRIPTION:
Nine:Situations:Group::bruiser has discovered a vulnerability in
CMailServer, which can be exploited by malicious users to compromise
a vulnerable system.

The vulnerability is caused due to a boundary error in the POP3 Class
ActiveX control (CMailCOM.dll) when handling arguments passed to the
"MoveToFolder()" method. This can be exploited to cause a stack-based
buffer overflow by sending a specially crafted POST request to
mvmail.asp with an overly long "indexOfMail" parameter.

Successful exploitation allows execution of arbitrary code.

NOTE: Other methods have also been mentioned as vulnerable and may be
exploitable similarly.

The vulnerability is confirmed in version 5.4.6. Other versions may
also be affected.

SOLUTION:
Grant only trusted users access to the application.

PROVIDED AND/OR DISCOVERED BY:
Nine:Situations:Group::bruiser

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/6012

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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.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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