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Cross-Site Scripting (XSS) in Phorum

Advisory ID:HTB23109
Vendor:Phorum Team
Vulnerable Versions:5.2.18 and probably prior
Tested Version:5.2.18
Advisory Publication:August 8, 2012 [without technical details]
Vendor Notification:August 8, 2012
Vendor Fix:August 24, 2012
Public Disclosure:August 29, 2012
Latest Update:August 24, 2012
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2012-4234
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in Phorum, which can be exploited to perform Cross-Site Scripting (XSS) attacks.
1) Cross-Site Scripting (XSS) in Phorum: CVE-2012-4234
Input passed via the "group" GET parameter to /control.php is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in user's browser session in context of an affected website.
The following PoC demonstrates the vulnerability:
http://[host]/control.php?0,panel=groupmod,group=%22%3E%3Cscript%3Ealert%28docum ent.cookie%29;%3C/script%3E

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Upgrade to Phorum 5.2.19

More Information:

[1] High-Tech Bridge Advisory HTB23109 - https://www.htbridge.com/advisory/HTB23109 - Cross-Site Scripting (XSS) in Phorum.
[2] Phorum - http://www.phorum.org - Started in 1998, Phorum was the original PHP and MySQL based Open Source forum software.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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