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Vulnerability of FFmpeg: out-of-bounds memory reading via block_cmp

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via block_cmp() of FFmpeg, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable software: Ubuntu.
Severity of this announce: 2/4.
Creation date: 23/07/2020.
Références of this computer vulnerability: CVE-2019-13312, USN-4431-1, VIGILANCE-VUL-32905.

Description of the vulnerability 

An attacker can force a read at an invalid address via block_cmp() of FFmpeg, in order to trigger a denial of service, or to obtain sensitive information.
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This cybersecurity bulletin impacts software or systems such as Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer vulnerability bulletin.

Solutions for this threat 

Ubuntu: new ffmpeg packages (23/07/2020).
New packages are available:
  Ubuntu 20.04 LTS: ffmpeg 7:4.2.4-1ubuntu0.1
  Ubuntu 18.04 LTS: ffmpeg 7:3.4.8-0ubuntu0.2
  Ubuntu 16.04 LTS: ffmpeg 7:2.8.17-0ubuntu0.1
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