Debian DLA-2779-1 : mediawiki - LTS security update

high Nessus Plugin ID 153966


The remote Debian host is missing one or more security-related updates.


The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2779 advisory.

- In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a sitewide block applied, it is able to still purge pages through the MediaWiki Action API (which a sitewide block should have prevented).

- MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page. (CVE-2021-41798)

- MediaWiki before 1.36.2 allows a denial of service (resource consumption because of lengthy query processing time). ApiQueryBacklinks (action=query&list;=backlinks) can cause a full table scan.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade the mediawiki packages.

For Debian 9 stretch, these problems have been fixed in version 1

See Also

Plugin Details

Severity: High

ID: 153966

File Name: debian_DLA-2779.nasl

Version: 1.4

Type: local

Agent: unix

Published: 10/10/2021

Updated: 11/28/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2021-35197


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:mediawiki, p-cpe:/a:debian:debian_linux:mediawiki-classes, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/9/2021

Vulnerability Publication Date: 7/2/2021

Reference Information

CVE: CVE-2021-35197, CVE-2021-41798, CVE-2021-41799