VLC Media Player Update

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.

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1. VULNERABILITIES

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CVE-2019-13615 Detail MODIFIED This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided. Current Description VideoLAN VLC media player 3.0.7.1 has a heap-based buffer over-read in mkv::demux_sys_t::FreeUnused() in modules/demux/mkv/demux.cpp when called from mkv::Open in modules/demux/mkv/mkv.cpp. Source: MITRE View Analysis Description Impact CVSS v3.0 Severity and Metrics: Base Score: 9.8 CRITICAL Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (V3 legend) Impact Score: 5.9 Exploitability Score: 3.9 Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None Scope (S): Unchanged Confidentiality (C): High Integrity (I): High Availability (A): High CVSS v2.0 Severity and Metrics: Base Score: 7.5 HIGH Vector: (AV:N/AC:L/Au:N/C/I/A) (V2 legend) Impact Subscore: 6.4 Exploitability Subscore: 10.0 Access Vector (AV): Network Access Complexity (AC): Low Authentication (AU): None Confidentiality (C): Partial Integrity (I): Partial Availability (A): Partial Additional Information: Allows unauthorized disclosure of information Allows unauthorized modification Allows disruption of service

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VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.

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Version 3.0.18 • Windows • 38 MB

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Changes between 3.0.20 and 3.0.21:
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Decoders:
* Improve Opus ambisonic support
* Fix some ASS subtitle rendering issues
* Fix Opus in MP4 behaviour
* Fix VAAPI hw decoding with some drivers

Input:
* Add support for HTTP content range handling according to RFC 9110
* Fix some HLS Adaptive Streaming not working in audio-only mode

Video Output:
* Super Resolution scaling with AMD GPUs
* The D3D11 HDR option can also turn on/off HDR for all sources regardless of
the display
* Improve subtitles rendering on Apple platforms of notably Asian languages
by correcting font fallback lookups

Video Filter:
* New AMD VQ Enhancer filter
* Add D3D11 option to use NVIDIA TrueHDR to generate HDR from SDR sources

Audio Output:
* Fix regression on macOS causing crashes when using audio devices
with more than 9 channels

Services Discovery:
* Fix exposed UPnP directory URL schemes to be compliant with RFC 3986

Contrib:
* Update FFmpeg to 4.4.4
* Update dav1d to 1.4.2
* Update libvpx to 1.14.1

libVLC:
* the HWND passed to libvlc_media_player_set_hwnd must have the WS_CLIPCHILDREN
style set.
* Fix crashes when using caopengllayer

Misc:
* Fix various warnings, leaks and potential crashes
* Fix security integer overflow in MMS module

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