oss-security - CVE-2017-2583 Kernel: Kvm: vmx/svm potential privilege escalation inside guest

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Date: Thu, 19 Jan 2017 16:42:09 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Xiaohan Zhang <zhangxiaohan1@...wei.com>
Subject: CVE-2017-2583 Kernel: Kvm: vmx/svm potential privilege escalation
 inside guest

   Hello,

Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) support 
is vulnerable an incorrect segment selector(SS) value error. It could occur 
loading values into SS register in long mode.

A user/process inside guest could use this flaw to crash the guest resulting 
in DoS or potentially escalate their privileges inside guest.

Upstream patch:
---------------
   -> https://git.kernel.org/linus/33ab91103b3415e12457e3104f0e4517ce12d0f3

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1414735

Note: On Intel CPUs it'd corrupt the guest state resulting in DoS; Whereas on
       AMD CPUs it could potentially escalate privileges inside guest.

This issue was discovered by Xiaohan Zhang of Huawei Inc.

'CVE-2017-2583' was assigned to this issue by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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