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Category:   Application (Forum/Board/Portal)  >   ACS Blog Vendors:   ASPPress.com
ACS Blog Input Validation Errors in 'Comments' Tags Let Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1013584
SecurityTracker URL:  http://securitytracker.com/id/1013584
CVE Reference:   CVE-2005-0945   (Links to External Site)
Updated:  Jul 7 2008
Original Entry Date:  Mar 28 2005
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.1.1
Description:   An input validation vulnerability was reported in ACS Blog. A remote user can conduct cross-site scripting attacks.

The Comments section does not properly validate user-supplied input in the [link], [mail], and [img] tags. A remote user can insert a specially crafted tag that, when viewed by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the ACS Blog software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Some demonstration exploit tags are provided:

[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]

Dan Crowley reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the ACS Blog software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry. The vendor is working on a fix.

As a temporary workaround, the vendor advises customers to remove the 'admin_comments.asp' file from their sites until a fix is available.

Vendor URL:  www.asppress.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Multiple XSS vulnerabilities in ACS Blog




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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