TUCoPS :: HP Unsorted S :: bx1565.htm

PR07-38: XSS on sIFR
PR07-38: XSS on sIFR

PR07-38: XSS on sIFR

Vulnerability Found: 12 November 2007

Vendor contacted: 19 November 2007

Vulnerability fixed: The issue remains unfixed. The developer of sIFR 
was contacted several times but did not respond.

Severity: Medium

Successfully tested on: sIFR 2.0.2


Sites using sIFR to render fonts/text are vulnerable to a vanilla XSS 
within the "txt" parameter processed by the actionscript in the 
'.swf' flash file.

Note: the victim user does NOT need to be authenticated for this 
vulnerability to be exploitable.

HTML injection PoC:

Provided the victim is tricked to load the following URL, he/she would 
be redirected to a third-party site.

https://target.tld/.swf?txt=click">href="http://www.procheckup.com">click me! 




An attacker may be able to cause execution of malicious scripting code 
in the browser of a user who clicks on a link to the target website, or 
visits a malicious website that requests such link.

This type of attack can result in non-persistent defacement of the 
target site, or the redirection of confidential information (i.e.: 
session IDs) to unauthorised third parties.




Credits: Jan Fry of ProCheckUp Ltd (www.procheckup.com) 


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