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Date: Fri, 18 Nov 2016 17:59:40 -0500
From: <cve-assign@...re.org>
To: <meissner@...e.de>
CC: <cve-assign@...re.org>, <oss-security@...ts.openwall.com>
Subject: Re: CVE Request: gstreamer plugins

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> Bufferoverflow in VMNC decoder in gstreamer plugins
> 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

>> The vmnc decoder in the gstreamer code base contains a fairly obvious
>> and simple width * height * depth integer overflow in the allocation
>> of the render buffer. From gst-plugins-bad1.0/gst/vmnc/vmncdec.c
>> 
>> vmnc_handle_wmvi_rectangle

Use CVE-2016-9445 for the integer overflow.


>> The render canvas, as allocated in the code snippet quoted way above,
>> is not black filled or otherwise initialized. The call to g_malloc()
>> is just a thin wrapper around malloc(), which does not initialize any
>> returned heap area. Therefore, there's an easy information leak in
>> 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 thumbnailing
>> services.

Use CVE-2016-9446 for the lack of initialization.


> Missing bounds check in NSF decoder in gstreamer plugins
> http://scarybeastsecurity.blogspot.de/2016/11/0day-exploit-compromising-linux-desktop.html

>> The vulnerability is in libgstnsf.so, an audio decoder present in the gstreamer-0.10 distribution.

>> 1: Lack of checking ROM size when mapping into 6502 memory and bank switching

>> an out of bounds read

>> [or] read and write control over the host emulator heap [when combined with]
>> 2: Ability to load or bank switch ROM to writable memory locations

Use CVE-2016-9447 for the entire libgstnsf.so report. The "2" issue is
not independently relevant.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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