FreeBSD : xen-kernel -- Certain domctl operations may be abused to lock up the host (103a47d5-27e7-11e5-a4a5-002590263bf5)

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

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

Description :

The Xen Project reports :

XSA-77 put the majority of the domctl operations on a list excepting
them from having security advisories issued for them if any effects
their use might have could hamper security. Subsequently some of them
got declared disaggregation safe, but for a small subset this was not
really correct: Their (mis-)use may result in host lockups.

As a result, the potential security benefits of toolstack
disaggregation are not always fully realised.

Domains deliberately given partial management control may be able to
deny service to the entire host.

As a result, in a system designed to enhance security by radically
disaggregating the management, the security may be reduced. But, the
security will be no worse than a non-disaggregated design.

See also :

http://xenbits.xen.org/xsa/advisory-127.html
http://www.nessus.org/u?5d689c69

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.1
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 84694 ()

Bugtraq ID:

CVE ID: CVE-2015-2751

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