Wikimedia Security Breach

A self-replicating JavaScript worm compromised the Wikimedia Foundation's infrastructure, resulting in unauthorized modifications to user scripts and defacement of meta-wiki content.

The security breach was initially detected by editors through Wikipedia's Village Pump (Technical) platform, where community members observed an unusual surge of automated modifications introducing concealed scripts and malicious alterations to various pages.

In response to the threat, Wikimedia's technical team imposed temporary editing restrictions across all projects to contain the attack and initiate the process of reversing unauthorized modifications.

Investigation records from Wikimedia's Phabricator tracking system suggest the compromise originated when a harmful script located on the Russian Wikipedia platform was activated, subsequently corrupting a global JavaScript component with malicious programming.

The problematic code resided at User:Ololoshka562/test.js, initially uploaded during March 2024, with apparent connections to scripts implicated in earlier wiki platform attacks.

Analysis of modification records by BleepingComputer indicates the script's first execution occurred through a Wikimedia staff member's account during user-script functionality testing. The circumstances remain unclear whether this represented deliberate action, inadvertent loading during routine testing procedures, or resulted from account compromise.

Examination of the archived test.js file reveals its propagation mechanism involved inserting malicious JavaScript loading code into both individual user common.js files and Wikipedia's universal MediaWiki:common.js, which affects all platform users.

The MediaWiki platform supports both universal and personalized JavaScript files, including MediaWiki:common.js and User:/common.js, which execute within editors' browsers to modify the wiki interface.

Following the initial test.js script execution within an authenticated editor's browser, it attempted dual-level modifications leveraging that editor's credentials and access rights:

* Individual user level: The worm attempted to replace User:/common.js with loading code that would automatically trigger the test.js script during any authenticated browsing session by that user.

* Platform-wide level: When the compromised account possessed sufficient administrative privileges, the malware would also alter the universal MediaWiki:common.js script, ensuring execution for every editor utilizing the global script configuration.

Script Infection Cycle

Once the main script was altered successfully, every user who accessed it would trigger the loader to run. This process would then cascade, causing each affected user to repeat the infection cycle, ultimately compromising their local version of the common.js file.

Worm Attack on Meta-Wiki

The worm's code cleverly concealed a hidden JavaScript loader within seemingly benign page edits.

It first fetched a random article via the 'Special:Random' command to target its modifications.

The edit inserted a massively oversized image and a hidden span containing a script tag.

This injected script was designed to propagate further, automatically compromising user common.js files.

Investigations indicate the incident led to the vandalism of nearly 4,000 pages.

Around 85 user accounts had their personal JavaScript files overwritten by the malicious code.

The full extent of the damage, including any article deletions, remains unclear and unquantified.

Engineers implemented a temporary edit lock across projects to halt the worm's spread and begin remediation.

The cleanup involved rolling back compromised user common.js files across the platform.

These altered pages have been suppressed from public view in revision histories.

Editing functionality has now been fully restored following the removal of the malicious code.

A comprehensive post-mortem analysis detailing the script's activation and propagation scope remains pending from Wikimedia.

Update Information:

The Wikimedia Foundation clarified the incident lasted a brief 23-minute window.

Impact was confined to Meta-Wiki, where altered and deleted content is in the process of restoration.

The event originated from internal security review activities, not an external attack.

No evidence suggests a breach of personal user data occurred during this incident.

The foundation is enhancing security protocols to prevent future occurrences of this nature.

Ongoing updates are being documented in the public incident log.

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