As promised some details on the security vulnerability I recently found. It 
concerned the Blackboard Content System where users could upload files with 
scripting and then lure other users to those pages and hijack their blackboard 
sessions and potentially steal their passwords using a specially crafted 
XMLHTTP request:
https://listserv.surfnet.nl/scripts/wa.exe?A2=ind05&L=cert-bulletins&F=&S=&P=1115

The thing is, this is absolutely not new. I didn't invent it myself, it comes 
straight from a whitepaper dated 2003-01-20: 
http://www.cgisecurity.com/whitehat-mirror/WhitePaper_screen.pdf


Blackboard has begun issuing a series of patches, but apart from disabling 
TRACE it looks like they want to focus on filtering javascript. It will be 
interesting to see if they can find javascript better then I can hide it :)

Jochem

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