FreeBSD : xen-kernel -- VMX: intercept issue with INVLPG on non-canonical address (80adc394-ddaf-11e5-b2bd-002590263bf5)

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


Synopsis :

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

Description :

The Xen Project reports :

While INVLPG does not cause a General Protection Fault when used on a
non-canonical address, INVVPID in its 'individual address' variant,
which is used to back the intercepted INVLPG in certain cases, fails
in such cases. Failure of INVVPID results in a hypervisor bug check.

A malicious guest can crash the host, leading to a Denial of Service.

See also :

http://xenbits.xen.org/xsa/advisory-168.html
http://www.nessus.org/u?27198d35

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 4.7
(CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 89012 ()

Bugtraq ID:

CVE ID: CVE-2016-1571

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