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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen libxl Read-Only Access Control Bypass Lets Local Users on a Guest System Write to the Target Disk
SecurityTracker Alert ID:  1033633
SecurityTracker URL:  http://securitytracker.com/id/1033633
CVE Reference:   CVE-2015-7311   (Links to External Site)
Date:  Sep 22 2015
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on a guest system can write to certain read-only disk devices on the target system.

libxl allows a disk device to be specified as read-only to the guest, but qemu does not support read-only restrictions. A local user on a guest system can write to a disk that is ostensibly read-only.

Only devices emulated by the device model are affected. Parallel PV devices for supporting PVHVM are not affected.

Systems using qemu-xen (rather than qemu-xen-traditional) as the device model version are affected.

Systems using libxl or libxl-based toolstacks, including xl and also libvirt with the libxl driver) are affected.

Michael Young of Durham University reported this vulnerability.

Impact:   A local user on a guest system can write to certain read-only disk devices on the target system.
Solution:   The vendor has issued a fix (xsa142-4.5.patch, xsa142-4.6.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-142.html

Vendor URL:  xenbits.xen.org/xsa/advisory-142.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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