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Date: Thu, 29 Oct 2015 23:39:39 +0800
From: Alan Hikerell <hikerell@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Xen VM Escape

Xen XSA-148(http://xenbits.xen.org/xsa/advisory-148.html) is the real VM
Escape Vulnerability

XSA-148 is public just now and it's a memory management logic vulnerability
obviously.
The bulletin means that a micious PV DomU could enable PS/RW flag of its
PDE to read/write the 2M page.
So, if a attacker prepare a page table at the 2M page, he could use the
vulnerability to modify the PT.
Finally, this vulnerability changes to a arbitrary machine memory
read/write vulnerability.

-- 
hikerell

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