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Vulnerability of LibreOffice: information disclosure by encryption disabling

Synthesis of the vulnerability 

An attacker can corrupt an encrypted MS-Office document to be edited with LibreOffice, in order to disable the encryption on next save and so get sensitive data.
Impacted products: LibreOffice, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this bulletin: 1/4.
Creation date: 18/05/2020.
Références of this threat: CERTFR-2020-AVI-298, CVE-2020-12801, openSUSE-SU-2020:0786-1, SUSE-SU-2020:1731-1, VIGILANCE-VUL-32289.

Description of the vulnerability 

An attacker can corrupt an encrypted MS-Office document to be edited with LibreOffice, in order to disable the encryption on next save and so to get sensitive data.
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This cybersecurity bulletin impacts software or systems such as LibreOffice, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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

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 

LibreOffice: version 6.3.6.
The version 6.3.6 is fixed:
  https://www.libreoffice.org/download/download/

LibreOffice: version 6.4.3.
The version 6.4.3 is fixed:
  https://www.libreoffice.org/download/download/

SUSE LE 12 SP4-5: new libreoffice packages.
New packages are available:
  SUSE LE 12 SP4: libreoffice 6.4.4.2-43.65.5
  SUSE LE 12 SP5: libreoffice 6.4.4.2-43.65.5

SUSE LE 15 SP1: new libreoffice packages.
New packages are available:
  openSUSE Leap 15.1: libreoffice 6.4.4.2-lp151.3.15.1
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