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Secunia Research: IMP Mail Deletion Security Bypass Vulnerability

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                     Secunia Research 10/01/2008

         - IMP Mail Deletion Security Bypass Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software

* IMP Webmail Client 4.1.5
* Horde Application Framework 3.1.5
* Horde Groupware Webmail Edition 1.0.3

NOTE: Other versions may also be affected.

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2) Severity

Rating: Moderately Critical
Impact: Manipulation of data
        Security bypass
Where:  From remote

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3) Vendor's Description of Software

"IMP is the Internet Messaging Program. It is written in PHP and
provides webmail access to IMAP and POP3 accounts."

Product Link:
http://www.horde.org/imp/

"Horde Groupware Webmail Edition is a free, enterprise ready, browser
based communication suite. Users can read, send and organize email
messages and manage and share calendars, contacts, tasks and notes
with the standards compliant components from the Horde Project."

Product Link:
http://www.horde.org/webmail/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in IMP Webmail Client
and Horde Groupware Webmail Edition, which can be exploited by
malicious people to bypass certain security restrictions and
manipulate data.

The HTML filter does not filter out <frame> and <frameset> HTML
elements. Additionally, the application allows users to perform
certain actions via HTTP requests without performing any validity
checks to verify the request. This can be exploited to (a) delete an
arbitrary number of e-mail messages by referencing their numeric IDs
and (b) purge deleted mails, when the victim opens a malicious HTML
mail.

Successful exploitation requires that the victim opens the HTML part
of a malicious message.

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5) Solution

Update to Horde 3.1.6 or Horde Groupware Webmail Edition 1.0.4.

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6) Time Table

12/12/2007: Mailed the vendor and the vendor-sec list.
19/12/2007: Mailed the vendor again.
21/12/2007: Vendor response.
28/12/2007: Vendor commits patch to CVS.
09/01/2008: Vendor releases fixed versions.
10/01/2008: Public disclosure.

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7) Credits

Discovered by Ulf Harnhammar, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-6018 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-102/

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

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