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                             CERT-Renater

                 Note d'Information No. 2020/VULN256
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DATE                : 07/05/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running VLC media player versions 3 prior
                                        to 3.0.9.

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https://www.videolan.org/security/sb-vlc309.html
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Security Bulletin VLC 3.0.9

Summary           : Multiple vulnerabilities fixed in VLC media player
Date              : April 2020
Affected versions : VLC media player 3.0.0 to 3.0.8 for most issues
ID                : VideoLAN-SB-VLC-309
CVE references    : CVE-2019-19721 CVE-2020-6071 CVE-2020-6072
CVE-2020-6073 CVE-2020-6077 CVE-2020-6078 CVE-2020-6079


Details

A remote user could:

- Create a specifically crafted image file that could trigger an out of
bounds read

- Send a specifically crafter request to the microdns service discovery,
potentially triggering various memory management issues


Impact

If successful, a malicious third party could trigger either a crash of
VLC or an arbitratry code execution with the privileges of the target
user.

While these issues in themselves are most likely to just crash the
player, we can't exclude that they could be combined to leak user
informations or remotely execute code. ASLR and DEP help reduce the
likelyness of code execution, but may be bypassed.

We have not seen exploits performing code execution through these
vulnerabilities

CVE-2019-19721 affects VLC 3.0.8 and earlier, and only reads 1 byte out
of bound Threat mitigation

Exploitation of those issues requires the user to explicitly open a
specially crafted file or stream.


Workarounds

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.

Until VLC gets updated to the 3.0.9 version, it is advised not to use
the network discovery, including for chromecast


Solution

VLC media player 3.0.9 addresses the issues.


Credits

CVE-2019-19721 was reported by Antonio Morales from the Semmle Security
Team

CVE-2020-6071 CVE-2020-6072 CVE-2020-6073 CVE-2020-6077 CVE-2020-6078
CVE-2020-6079 were discovered & reported by Claudio Bozzato from Cisco Talos


Special thanks

VideoLAN would like to thank Antonio Morales and Claudio Bozzato for
their time and cooperation with the VideoLAN security team


References

The VideoLAN project
    http://www.videolan.org/
VLC official GIT repository
    http://git.videolan.org/?p=vlc.git



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