PT-2020-17338 · Wikimedia+1 · Mediawiki+1

Umherirrender · Published 2020-12-18 · Updated 2024-03-06 · CVE-2020-35478

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions MediaWiki versions 1.33.0 through 1.35.1

Description The issue allows for XSS via BlockLogFormatter.php, where MediaWiki:blanknamespace can potentially be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink().

Recommendations For versions 1.33.0 through 1.35.1, update to version 1.35.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the LogFormatter::makePageLink() function until a patch is available. Avoid using the MediaWiki:blanknamespace variable in the affected API endpoint until the issue is resolved.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

ALT-PU-2020-3554

ALT-PU-2020-3568

BIT-MEDIAWIKI-2020-35478

CVE-2020-35478

Affected Products

Alt Linux

Mediawiki

References · 16

• 🔥 https://phabricator.wikimedia.org/T268938 · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC · Vendor Advisory
• https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-35478 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-35478 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-35478 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-35478 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-35478 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-mediawiki-2020-35478 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-35478 · Security Note
• https://osv.dev/vulnerability/CVE-2020-35478 · Vendor Advisory
• https://lists.wikimedia.org/pipermail/wikitech-l/2020-December/094126.html · Note
• https://t.me/cvenotify/7777 · Telegram Post
• https://t.me/cvenotify/7341 · Telegram Post
• https://t.me/cibsecurity/21052 · Telegram Post