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TITLE:
SqWebMail Conditional Comments Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA16704

VERIFY ADVISORY:
http://secunia.com/advisories/16704/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
SqWebMail 3.x
http://secunia.com/product/2553/
SqWebMail 4.x
http://secunia.com/product/3601/
SqWebMail 5.x
http://secunia.com/product/4989/

DESCRIPTION:
Secunia Research has discovered a vulnerability in SqWebMail, which
can be exploited by malicious people to conduct script insertion
attacks.

The vulnerability is caused due to SqWebMail allowing usage of e.g.
the "<script>" tag within an HTML comment. This, combined with
"Conditional Comments" in Internet Explorer, can be exploited to
execute arbitrary script code in a user's browser session in context
of a vulnerable site when a malicious email is viewed.

Successful exploitation requires that the user is using Internet
Explorer.

Example in an HTML email:
<!--[if IE]>
<script>alert("Vulnerable!");</script>
<![endif]-->

The vulnerability has been confirmed in version 5.0.4. Prior version
may also be affected.

SOLUTION:
The vendor has issued an updated version of SqWebMail, which fixes
this vulnerability.
http://www.courier-mta.org/?download.php

PROVIDED AND/OR DISCOVERED BY:
Jakob Balle, Secunia Research.

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2005-44/advisory/

OTHER REFERENCES:
Information about "Conditional Comments":
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/overview/ccomment_ovw.asp

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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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http://secunia.com/about_secunia_advisories/


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