FreeBSD : xen-kernel -- x86 task switch to VM86 mode mis-handled (523bb0b7-ba4d-11e6-ae1b-002590263bf5)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The Xen Project reports :

LDTR, just like TR, is purely a protected mode facility. Hence even
when switching to a VM86 mode task, LDTR loading needs to follow
protected mode semantics. This was violated by the code.

On SVM (AMD hardware): a malicious unprivileged guest process can
escalate its privilege to that of the guest operating system.

On both SVM and VMX (Intel hardware): a malicious unprivileged guest
process can crash the guest.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214936
https://xenbits.xen.org/xsa/advisory-192.html
http://www.nessus.org/u?922adaae

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95506 ()

Bugtraq ID:

CVE ID: CVE-2016-9382

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