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Harry Waldron - IT Security

Security Developments, Software Updates and Best Practices

New PDF based Cross-Scripting vulnerability

This new PDF XSS vulnerability should be carefully watched for further developments:

New PDF based Cross-Scripting vulnerability
http://www.incidents.org/diary.php?storyid=1999
http://events.ccc.de/congress/2006/Fahrplan/events/1602.en.html



QUOTE: A new cross-site scripting attack was announced at the 23rd CCC by Stefano Di Paola & Giorgio Fedon. The gist of the attack is that you are able to get javascript executed by simple having it appended to the PDF's URL.  This doesn't require the ability to write the PDF, just the ability to generate a URL that is based on a PDF hosted on some site.

Mitigation: Turning off javascript seems effective at mitigating this. Militant use of the NoScript extension for Firefox would be my recommendation. Of course you have to turn off javascript for everything (specifically the target domains, not the website setting up the attack. in the Disenchant examples you would have to disable scripting for Google, MySpace, Microsoft, Ebay and BofA) but ...

Comments

Harry Waldron - Microsoft MVP Blog said:

Abode users should move to version 8 to avoid the PDF Cross Scripting vulnerability . Version 8 offers

# January 3, 2007 3:55 PM