Subject: [ASA-201701-3] gst-plugins-bad: multiple issues

Arch Linux Security Advisory ASA-201701-3
=========================================

Severity: High
Date    : 2017-01-02
CVE-ID  : CVE-2016-9445 CVE-2016-9446
Package : gst-plugins-bad
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-76

Summary
=======

The package gst-plugins-bad before version 1.10.2-2 is vulnerable to
multiple issues including arbitrary code execution and information
disclosure.

Resolution
==========

Upgrade to 1.10.2-2.

# pacman -Syu "gst-plugins-bad>=1.10.2-2"

The problems have been fixed upstream in version 1.10.2.

Workaround
==========

None

Description
===========

- CVE-2016-9445 (arbitrary code execution)

The vmnc decoder in gst-plugins-bad of the gstreamer code base contains
a width * height * depth integer overflow in the allocation of the
render buffer inside gst/vmnc/vmncdec.c.

- CVE-2016-9446 (information disclosure)

An information disclosure vulnerability has been discovered in the
render canvas functionality of gst-plugins-bad due to the lack of
initializing the returned heap area of g_malloc(). An example for the
information leak would be thumbnailing a simple 1 frame vmnc movie that
does not draw to the allocated render canvas at all.
This could be a problem for anyone using gstreamer in a server
environment to provide a thumbnailing services.

Impact
======

An attacker is able to provide a crafted VMNC file that would allow for
either arbitrary code execution or disclose information of the memory
of the running host.

References
==========

http://www.openwall.com/lists/oss-security/2016/11/18/13
https://scarybeastsecurity.blogspot.de/2016/11/0day-poc-risky-design-decisions-in.html
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/gst/vmnc/vmncdec.c?id=4cb1bcf1422bbcd79c0f683edb7ee85e3f7a31fe
https://bugzilla.gnome.org/show_bug.cgi?id=774533
https://security.archlinux.org/CVE-2016-9445
https://security.archlinux.org/CVE-2016-9446