CVE-2020-35480 Information

Description

An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don’t exist) and hidden users (accounts that have been explicitly hidden due to being abusive or similar) that the viewer cannot see are handled differently exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html https://phabricator.wikimedia.org/T120883 https://www.debian.org/security/2020/dsa-4816 https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html https://lists.fedoraproject.org/archives/list/[email protected]/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3