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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen QEMU Block Unplug Protocol Use-After-Free Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1033175
SecurityTracker URL:  http://securitytracker.com/id/1033175
CVE Reference:   CVE-2015-5166   (Links to External Site)
Date:  Aug 3 2015
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

The system does not properly unplug an emulated block device. A local user on a HVM guest system can attempt to unplug an emulated IDE device for a second time to trigger a use-after-free in the QEMU process and gain privileges on the host system.

x86 HVM guests running "qemu-xen" are affected.

Donghai Zhu of Alibaba reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa139-qemuu-unstable.patch, xsa139-qemuu-4.5.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-139.html

Vendor URL:  xenbits.xen.org/xsa/advisory-139.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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