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Vulnerability of MediaWiki: information disclosure via Cache-Control Vary headers

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Cache-Control Vary headers of MediaWiki, in order to obtain sensitive information.
Impacted products: Debian, Fedora.
Severity of this bulletin: 2/4.
Creation date: 06/07/2020.
Références of this threat: CVE-2020-15005, DLA-2504-1, DSA-4767-1, FEDORA-2020-9c97633708, VIGILANCE-VUL-32709.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Cache-Control Vary headers of MediaWiki, in order to obtain sensitive information.
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This vulnerability note impacts software or systems such as Debian, Fedora.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability 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 threat note.

Solutions for this threat 

Debian 10: new mediawiki packages.
New packages are available:
  Debian 10: mediawiki 1:1.31.10-1~deb10u1

Debian 9: new mediawiki packages.
New packages are available:
  Debian 9: mediawiki 1:1.27.7-1~deb9u7

Fedora 32: new mediawiki packages.
New packages are available:
  Fedora 32: mediawiki 1.33.4-1.fc32
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