CVE-2020-35480

NameCVE-2020-35480
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2504-1, DSA-4816-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mediawiki (PTS)buster1:1.31.16-1+deb10u2fixed
buster (security)1:1.31.16-1+deb10u7fixed
bullseye (security), bullseye1:1.35.13-1~deb11u1fixed
bookworm, bookworm (security)1:1.39.5-1~deb12u1fixed
sid, trixie1:1.39.6-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mediawikisourcestretch1:1.27.7-1~deb9u7DLA-2504-1
mediawikisourcebuster1:1.31.12-1~deb10u1DSA-4816-1
mediawikisource(unstable)1:1.35.1-1

Notes

https://phabricator.wikimedia.org/T120883
https://lists.wikimedia.org/pipermail/wikitech-l/2020-December/094126.html

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