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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen libxl Error Conditions Let Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034389
SecurityTracker URL:  http://securitytracker.com/id/1034389
CVE Reference:   CVE-2015-8341   (Links to External Site)
Date:  Dec 11 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system.

In certain cases when a guest is constructed that is configured to use a PV bootloader that runs as a userspace process in the toolstack domain and the domain fails to build successfully, a leak of virtual address space may occur. As a result, temporary disk files containing the kernel and initial ramdisk may be unrecoverable. In addition, the toolstack process may run out of memory and excessive files may be created on the toolstack domain filesystem.

ARM and x86 systems that use a libxl based toolstack are affected.

Only libxl-based toolstacks that manage multiple domains in the same process (e.g., 'libvirt') are affected.

Toolstacks that do not use libxl are not affected.

Only domains configured to use a PV bootloader in the toolstack domain (e.g., pygrub) are affected.

x86 HVM domains are not affected.

George Dunlap of Citrix reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   The vendor has issued a fix (xsa160-4.4.patch, xsa160-4.6.patch, and xsa160.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-160.html

Vendor URL:  xenbits.xen.org/xsa/advisory-160.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


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