Bug 1909240 (CVE-2020-35480) - CVE-2020-35480 mediawiki: divergent behavior for contributions and user pages of hidden users and missing users
Summary: CVE-2020-35480 mediawiki: divergent behavior for contributions and user pages...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-35480
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1909241 1910209
Blocks: 1909242
TreeView+ depends on / blocked
 
Reported: 2020-12-18 17:16 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-10-28 02:59 UTC (History)
11 users (show)

Fixed In Version: mediawiki 1.31.11, mediawiki 1.35.1
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2021-10-28 02:59:20 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-12-18 17:16:14 UTC 
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.

References:
https://phabricator.wikimedia.org/T120883
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
Comment 1 Guilherme de Almeida Suckevicz 2020-12-18 17:16:29 UTC 
Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 1909241]
Comment 3 Sam Fowler 2020-12-23 06:25:44 UTC 
External References:

https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
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