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TITLE:
Free SMTP Server Open Mail Relay Vulnerability

SECUNIA ADVISORY ID:
SA16698

VERIFY ADVISORY:
http://secunia.com/advisories/16698/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
Free SMTP Server 2.x
http://secunia.com/product/5660/

DESCRIPTION:
basher13 has discovered a vulnerability in Free SMTP Server, which
can be exploited by malicious people to use it as an open mail
relay.

The vulnerability is caused due to the server accepting
unauthenticated connections on any network interfaces, instead of
restricting connections to localhost only according to the product
description.

The vulnerability has been confirmed in version 2.2. Other versions
may also be affected.

SOLUTION:
Filtering incoming traffic to the SMTP service.

PROVIDED AND/OR DISCOVERED BY:
basher13

ORIGINAL ADVISORY:
http://k.domaindlx.com/shellcore/advisories.asp?bug_report=display&infamous_group=87

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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:
http://secunia.com/secunia_security_advisories/

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
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