CVE-2021-31553

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se detectó un problema en la extensión CheckUser para MediaWiki versiones hasta 1.35.2. Unos nombres de usuario de MediaWiki con espacios en blanco al final podrían ser almacenados en la tabla de la base de datos cu_log de manera que se produjera una denegación de servicio para determinadas páginas de extensión y funcionalidad CheckUser. Por ejemplo, el atacante podría desactivar Special: CheckUserLog y así interferir con el seguimiento del uso

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-22 CVE Reserved
2021-04-22 CVE Published
2024-01-05 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-428: Unquoted Search Path or Element

CAPEC

References (7)

URL	Tag	Source
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963	Issue Tracking
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964	Issue Tracking
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023	Issue Tracking
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024	Issue Tracking
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025	Issue Tracking
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027	Issue Tracking
https://phabricator.wikimedia.org/T275669	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mediawiki Search vendor "Mediawiki"		Mediawiki Search vendor "Mediawiki" for product "Mediawiki"				<= 1.35.2 Search vendor "Mediawiki" for product "Mediawiki" and version " <= 1.35.2"		-		Affected