CVE-2021-31553

An issue was discovered in the CheckUser extension for MediaWiki through 1.35.2. MediaWiki usernames with trailing whitespace could be stored in the cu_log database table such that denial of service occurred for certain CheckUser extension pages and functionality. For example, the attacker could turn off Special:CheckUserLog and thus interfere with usage tracking.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 70%
VendorProductVersion
mediawikimediawiki
𝑥
≤ 1.35.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027
https://phabricator.wikimedia.org/T275669
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027
https://phabricator.wikimedia.org/T275669