CVE-2021-31553
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
6.3 Medium
AI Score
Confidence
High
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:P/A:P
0.003 Low
EPSS
Percentile
68.8%
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.
| CPE | Name | Operator | Version |
|---|---|---|---|
| mediawiki:mediawiki | mediawiki | le | 1.35.2 |
References
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025
gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027
phabricator.wikimedia.org/T275669
Related
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
6.3 Medium
AI Score
Confidence
High
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:P/A:P
0.003 Low
EPSS
Percentile
68.8%