FreeBSD : X.org libraries -- multiple vulnerabilities (1cf65085-a760-41d2-9251-943e1af62eb8)

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


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

Matthieu Herrb reports :

Tobias Stoeckmann from the OpenBSD project has discovered a number of
issues in the way various X client libraries handle the responses they
receive from servers, and has worked with X.Org's security team to
analyze, confirm, and fix these issues. These issue come in addition
to the ones discovered by Ilja van Sprundel in 2013.

Most of these issues stem from the client libraries trusting the
server to send correct protocol data, and not verifying that the
values will not overflow or cause other damage. Most of the time X
clients and servers are run by the same user, with the server more
privileged than the clients, so this is not a problem, but there are
scenarios in which a privileged client can be connected to an
unprivileged server, for instance, connecting a setuid X client (such
as a screen lock program) to a virtual X server (such as Xvfb or
Xephyr) which the user has modified to return invalid data,
potentially allowing the user to escalate their privileges.

See also :

https://lists.x.org/archives/xorg-announce/2016-October/002720.html
http://www.nessus.org/u?c7a7dbd7

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 93933 ()

Bugtraq ID:

CVE ID: CVE-2016-5407

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