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TITLE:
SqWebMail Attached File Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA16539

VERIFY ADVISORY:
http://secunia.com/advisories/16539/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

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

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 attached files
to be viewed in context of the SqWebMail server. This can be
exploited to execute arbitrary script code in a user's browser
session in context of the SqWebMail server when a user clicks
"Display" on an attached file.

Example Attack Scenario:
1) The user receives an email with an attachment called e.g.
"image.jpg".
2) The user uses the SqWebMail "Display" feature to view the attached
file.
3) This causes SqWebMail to output the contents of the attachment in
context of the SqWebMail server.

However, when SqWebMail outputs the file, the user-controlled
"Content-Type" from the email is used, which causes the browser to
e.g. treat the content as "text/html" thereby executing any included
script code in context of the SqWebMail server.

Successful exploitation allows a malicious person to perform the same
actions as the user of the web mail account (e.g. sending or viewing
emails).

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

SOLUTION:
Don't "Display" or "Download" attached files.

NOTE: The vendor does not acknowledge this as a vulnerability.
However, the vendor has changed some functionality for all upcoming
versions based on this report.

SqWebMail version 5.0.4, snapshot builds from 23/08/2005 and later
will include the user-controlled "Content-Type" field when showing
attached files in emails. However, this does not prevent exploitation
of the vulnerability.

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

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2005-35/advisory/

OTHER REFERENCES:
Vendor Response:
http://marc.theaimsgroup.com/?l=courier-users&m=112488135424849&w=2

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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
use those supplied by the vendor.

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