FreeBSD : xen-kernel -- x86: Missing SMAP whitelisting in 32-bit exception / event delivery (04cf89e3-5854-11e6-b334-002590263bf5)

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 :

Supervisor Mode Access Prevention is a hardware feature designed to
make an Operating System more robust, by raising a pagefault rather
than accidentally following a pointer into userspace. However,
legitimate accesses into userspace require whitelisting, and the
exception delivery mechanism for 32bit PV guests wasn't whitelisted.

A malicious 32-bit PV guest kernel can trigger a safety check,
crashing the hypervisor and causing a denial of service to other VMs
on the host.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211482
http://xenbits.xen.org/xsa/advisory-183.html
http://www.nessus.org/u?c13e1826

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: 92675 ()

Bugtraq ID:

CVE ID: CVE-2016-6259

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