FreeBSD : xen-kernel -- x86 segment base write emulation lacking canonical address checks (53dbd096-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 :

Both writes to the FS and GS register base MSRs as well as the
WRFSBASE and WRGSBASE instructions require their input values to be
canonical, or a #GP fault will be raised. When the use of those
instructions by the hypervisor was enabled, the previous guard against
#GP faults (having recovery code attached) was accidentally removed.

A malicious guest administrator can crash the host, leading to a DoS.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214936
https://xenbits.xen.org/xsa/advisory-193.html
http://www.nessus.org/u?24820f0d

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 4.9
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95507 ()

Bugtraq ID:

CVE ID: CVE-2016-9385

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now