FreeBSD : xen-kernel -- x86 64-bit bit test instruction emulation broken (56f0f11e-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 :

The x86 instructions BT, BTC, BTR, and BTS, when used with a
destination memory operand and a source register rather than an
immediate operand, access a memory location offset from that specified
by the memory operand as specified by the high bits of the register
source.

A malicious guest can modify arbitrary memory, allowing for arbitrary
code execution (and therefore privilege escalation affecting the whole
host), a crash of the host (leading to a DoS), or information leaks.
The vulnerability is sometimes exploitable by unprivileged guest user
processes.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214936
https://xenbits.xen.org/xsa/advisory-195.html
http://www.nessus.org/u?114555de

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95509 ()

Bugtraq ID:

CVE ID: CVE-2016-9383

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