CVE-2021-31553
MediaWiki CheckUser Trailing Whitespace Denial of Service
Description
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.
INFO
Published Date :
April 22, 2021, 3:15 a.m.
Last Modified :
April 22, 2021, 8:14 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-31553.
| URL | Resource |
|---|---|
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963 | Issue Tracking Third Party Advisory |
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964 | Issue Tracking Third Party Advisory |
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023 | Issue Tracking Third Party Advisory |
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024 | Issue Tracking Third Party Advisory |
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025 | Issue Tracking Third Party Advisory |
| https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027 | Issue Tracking Third Party Advisory |
| https://phabricator.wikimedia.org/T275669 | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-31553 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-31553 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Apr. 22, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963 Issue Tracking, Third Party Advisory Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964 Issue Tracking, Third Party Advisory Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023 Issue Tracking, Third Party Advisory Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024 Issue Tracking, Third Party Advisory Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025 Issue Tracking, Third Party Advisory Changed Reference Type https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027 No Types Assigned https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027 Issue Tracking, Third Party Advisory Changed Reference Type https://phabricator.wikimedia.org/T275669 No Types Assigned https://phabricator.wikimedia.org/T275669 Third Party Advisory Added CWE NIST CWE-428 Added CPE Configuration OR *cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* versions up to (including) 1.35.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-31553 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-31553
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.29 }} 0.02%
score
0.65881
percentile