Secunia Research: SqWebMail Conditional Comments Script Insertion Vulnerability

[Secunia Research <vuln () secunia com>]

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                     Secunia Research 06/09/2005

  - SqWebMail Conditional Comments Script Insertion Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9

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1) Affected Software 

SqWebMail 5.0.4

Prior versions may also be affected.

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2) Severity 

Rating: Moderately Critical
Impact: Script Insertion
Where:  From Remote

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3) Description of Vulnerability

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]-->

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4) Solution 

The vendor has issued an updated version of SqWebMail, which fixes
this vulnerability.

http://www.courier-mta.org/?download.php

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5) Time Table 

05/09/2005 - Initial vendor notification.
05/09/2005 - Vendor confirms vulnerability and releases a fix.
06/09/2005 - Public disclosure.

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6) Credits 

Discovered by Jakob Balle, Secunia Research.

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7) References

No references available.

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8) About Secunia 

Secunia collects, validates, assesses, and writes advisories regarding 
all the latest software vulnerabilities disclosed to the public. These 
advisories are gathered in a publicly available database at the 
Secunia website: 

http://secunia.com/

Secunia offers services to our customers enabling them to receive all 
relevant vulnerability information to their specific system 
configuration. 

Secunia offers a FREE mailing list called Secunia Security Advisories: 

http://secunia.com/secunia_security_advisories/

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9) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2005-44/advisory/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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