Unspecified vulnerability in Microsoft Internet Explorer 8 on Windows 7 allows remote attackers to bypass Protected Mode and create arbitrary files by leveraging access to a Low integrity process, as demonstrated by Stephen Fewer as the third of three chained vulnerabilities during a Pwn2Own competition at CanSecWest 2011.
https://threatpost.com/en_us/blogs/pwn2own-winner-stephen-fewer-031011
https://exchange.xforce.ibmcloud.com/vulnerabilities/66064
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-057
http://www.securityfocus.com/bid/46821
http://www.computerworld.com/s/article/9214002/Safari_IE_hacked_first_at_Pwn2Own
http://twitter.com/msftsecresponse/statuses/45646985998516224