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Vigil@nce - Linux kernel: access to protected memory area under KVM

March 2017 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker process, inside a guest system, can set its stack
segment register to 0, in order to get the kernel privileges on
the host system.

 Impacted products: Debian, Fedora, Linux, openSUSE Leap, SUSE
Linux Enterprise Desktop, SLES, Ubuntu.
 Severity: 2/4.
 Creation date: 19/01/2017.

DESCRIPTION OF THE VULNERABILITY

The Linux kernel product offers a heavyweight virtualization layer
Kernel Virtual Machine.

The machine instruction that set the stack segment register must
be emulated by KVM in order to provide separate segment tables to
each guest system. However, the case of the segment number 0 is
special for the processor and the emulator mishandle it. On a host
having an AMD processor, the effect is to give the privilege level
of the host kernel to the code of the guest process.

An attacker process, inside a guest system, can therefore set its
stack segment register to 0, in order to get the kernel privileges
on the host system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Linux-kernel-access-to-protected-memory-area-under-KVM-21637


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