Critical Vulnerabilities in VLC Media Player Spotted and Patched

by Hilbert Hagedoorn on: 06/27/2019 07:18 AM | source: securityweek | 10 comment(s)

VideoLAN has addressed a critical double-free vulnerability in the VLC media player that could allow an attacker to execute arbitrary code on target systems. This security loophole can be used to plant malware in the computer where the media player is being used.

The security flaws on versions 3.0.6 and earlier of the software can enable hackers to load types of video files that can execute arbitrary code. Tracked as CVE-2019-12874, the security flaw features a CVSS v3 score of 9.8. The bug resides in the zlib_decompress_extra function of the VLC media player and could be triggered during the parsing of a malformed MKV file type within the Matroska demuxer.

Discovered by Symeon Paraschoudis from Pen Test Partners, the issue allows a remote attacker to create a specially crafted file to trigger a double free in zlib_decompress_extra() (demux/mkv/utils.cpp). The vulnerability has been addressed with the release of VLC 3.0.7, which also fixes a high-severity heap buffer overflow, along with various other vulnerabilities. Tracked as CVE-2019-5439 and residing in the ReadFrame (demux/avi/avi.c) function, the buffer overflow could be exploited through a specially crafted .avi file. The bug was reported through HackerOne, as part of a bug bounty program run by the European Union. The issue is that the ReadFrame function uses a variable obtained directly from the file. Because no strict check is performed before the memory operation (memmove, memcpy), a buffer overflow could be triggered.

“If successful, a malicious third party could trigger either a crash of VLC or an arbitrary code execution with the privileges of the target user,” VideoLAN explains in an advisory detailing both security bugs.

To successfully exploit the vulnerabilities, an attacker would have to trick the user into explicitly opening a specially crafted file or stream. While ASLR and DEP help reduce exposure, they may be bypassed, the advisory reads.

“The user should refrain from opening files from untrusted third parties or accessing untrusted remote sites (or disable the VLC browser plugins), until the patch is applied,” VideoLAN recommends.

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sverek

Posts: 5450
Joined: 2011-01-02

#5684852 Posted on: 06/27/2019 07:43 AM

Shout out to VLC for being free and awesome.

SniperX
Member

Posts: 86
Joined: 2018-05-04

#5684867 Posted on: 06/27/2019 08:49 AM

Changes between 3.0.7 and 3.0.7.1:
----------------------------------

Access:
* Update libbluray to 1.1.2

macOS:
* Fix bluray java menu playback regression in 3.0.7

Video Output:
* Fix hardware acceleration with some AMD drivers
* Improve direct3d11 HDR support

Changes between 3.0.6 and 3.0.7:
--------------------------------

Access:
* Improve Blu-ray support
* Fix sftp module build with libssh >= 1.8.1

Audio output:
* Fix pass-through on Android-23
* Fix DirectSound drain

Demux:
* Improve MP4 support

Video Output:
* Fix 12 bits sources playback with Direct3D11
* Fix crash on iOS
* Fix midstream aspect-ratio changes when Windows hardware decoding is on
* Fix HLG display with Direct3D11

Stream Output:
* Improve Chromecast support with new ChromeCast apps

macOS:
* Fix UPNP service discovery, services are discovered on the highest priority
active network interface now
* Fix video distortion on macOS Mojave

Misc:
* Update Youtube, Dailymotion, Vimeo, Soundcloud scripts
* Work around busy looping when playing an invalid item with loop enabled

Translations:
* Update of most translations

Security:
* Fix multiple buffer overflows in the ps demuxer
* Fix a buffer overflow when copying a biplanar YUV image
* Fix multiple buffer overflows in the faad decoder
* Fix buffer overflow in the svcdsub decoder
* Fix buffer overflows in the ogg muxer & demuxer
* Fix buffer overflows in libavformat demuxer
* Fix multiple buffer overflows in the MKV demuxer
* Fix a buffer overflow in the MP4 demuxer
* Fix a buffer overflow in the textst decoder
* Fix a buffer overflow in the webvtt decoder
* Fix a buffer overflow in the ASF demux
* Fix a buffer overflow in the UPNP SD
* Fix use after free in the ogg demuxer
* Fix multiple use after free in the MKV demuxer
* Fix multiple use after free in the DMO decoder
* Fix integer underflow in the MKV demuxer
* Fix an updater NULL pointer dereference on invalid signing keys
* Fix NULL pointer dereference in the MKV demuxer
* Fix an integer overflow in the spudec decoder
* Fix an integer overflow in the nsc demuxer
* Fix an integer overflow in the avi demuxer
* Fix reads of uninitialized pointers in the MKV demuxer
* Fix a floating point exception in the MKV demuxer
* Fix an infinite loop in the flac packetizer

Jagman
Senior Member

Posts: 2222
Joined: 2005-03-26

#5684912 Posted on: 06/27/2019 11:57 AM

Updated and +1 for VLC being awesome

Rich_Guy
Senior Member

Posts: 12318
Joined: 2003-05-11

#5684915 Posted on: 06/27/2019 12:03 PM

Just updated, thanks Hilbert

rl66
Senior Member

Posts: 2213
Joined: 2007-05-31

#5684960 Posted on: 06/27/2019 02:02 PM

patched before reading... I like reactive company.

Thunk_It
Senior Member

Posts: 164
Joined: 2010-07-20

#5685384 Posted on: 06/29/2019 12:00 AM

Many thanks Hilbert for posting this article. As a result I definitely updated my VLC player!

azraei97
Junior Member

Posts: 6
Joined: 2018-10-31

#5685489 Posted on: 06/29/2019 12:19 PM

Well, I'm not really care. VLC simply not good enough to play what I want properly long ago. Not sure now. I try to use VLC for android recently, it has same problem with some media same like the desktop version but I like a bit for android version because compare to other android m player, VLC no ads with it Free To Use. Now I use SMPlayer (MPV), K-Lite (MPC) for my PC meanwhile my phone/android base hardware use MX Player (MPV).

rl66
Senior Member

Posts: 2213
Joined: 2007-05-31

#5686927 Posted on: 07/03/2019 10:43 PM

MX Player is the best on Android device and read nearly everything ...
On PC VLC still rock because with some few search on the net it can play BR and BR iso and also record streaming (but shhh it's both not allowed) but it is still crappy with real DVD reading.

The Goose
Senior Member

Posts: 2272
Joined: 2008-02-25

#5686939 Posted on: 07/03/2019 11:09 PM

Not used Vlc since i switched to MPC-HC x64 several years ago.....it has an auto shut down function which is handy for me as i have Tinnitus and have a film running in the background when im trying to get to sleep, i find windows sleep function does not always work unlike mpc which will shutdown my pc when the film is finished....8 times out of 10 ive fallen to sleep within the first 10 minutes, some times it takes 2 films.

sverek
Senior Member

Posts: 5450
Joined: 2011-01-02

#5686967 Posted on: 07/04/2019 02:48 AM

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