PR07-38: XSS on sIFR Jan 22 2008 10:31AM
ProCheckUp Research (research procheckup com)
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
'<fontname>.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.

href="">click me!</a>




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 (


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