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TITLE:
Hexamail Server "USER" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA26666

VERIFY ADVISORY:
http://secunia.com/advisories/26666/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

SOFTWARE:
Hexamail Server 3.x
http://secunia.com/product/15561/

DESCRIPTION:
rgod has reported a vulnerability in Hexamail Server, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within pop3server
when processing POP3 "USER" commands. This can be exploited to cause a
heap-based buffer overflow by sending a "USER" command with an overly
long parameter to the affected server.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is reported in version 3.0.0.001. Prior versions
may also be affected.

SOLUTION:
Update to 3.0.1.004.

PROVIDED AND/OR DISCOVERED BY:
rgod

ORIGINAL ADVISORY:
http://retrogod.altervista.org/hexamail_bof.html

OTHER REFERENCES:
http://milw0rm.com/exploits/4344

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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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Definitions: (Criticality, Where etc.)
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Please Note:
Secunia recommends that you verify all advisories you receive by
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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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