CVE-2020-29004 in Push Extension
Summary
by MITRE • 01/29/2021
The API in the Push extension for MediaWiki through 1.35 did not require an edit token in ApiPushBase.php and therefore facilitated a CSRF attack.
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Analysis
by VulDB Data Team • 02/21/2021
The vulnerability identified as CVE-2020-29004 resides within the Push extension for MediaWiki version 1.35 and earlier, representing a critical security flaw that undermines the integrity of the platform's application programming interface. This issue specifically affects the ApiPushBase.php component where the extension fails to enforce proper authentication mechanisms, creating an exploitable condition that allows malicious actors to manipulate the system through cross-site request forgery attacks. The absence of edit token validation in the API layer fundamentally compromises the security model of the MediaWiki platform, particularly when dealing with push notification functionality that could potentially be leveraged for unauthorized modifications.
The technical flaw manifests as a missing validation check for edit tokens within the API endpoint implementation, which should have been required to authenticate and authorize any modifications to the system's push notification configuration. This weakness directly correlates to CWE-352, which defines Cross-Site Request Forgery as a vulnerability where the application fails to validate the authenticity of requests originating from unauthorized sources. The vulnerability enables attackers to craft malicious requests that appear to originate from legitimate users, bypassing the normal authentication and authorization mechanisms that should protect the system's core functionality. The Push extension's API implementation fails to properly verify the token that should confirm the user's intent and authorization level, creating a pathway for unauthorized modifications to be executed silently in the background.
Operationally, this vulnerability poses significant risks to MediaWiki installations that utilize the Push extension, as it allows attackers to perform unauthorized modifications to push notification settings and potentially trigger malicious actions through the notification system. The impact extends beyond simple configuration changes, as the compromised API endpoint could enable attackers to manipulate the delivery of notifications, potentially delivering malicious payloads or disrupting service availability. The attack vector requires minimal sophistication since the vulnerability exists in the API layer itself, making it particularly dangerous for organizations that rely on MediaWiki for content management and collaboration platforms. The CSRF nature of the vulnerability means that attackers can exploit this weakness through social engineering or by tricking users into visiting malicious websites that automatically submit requests to the vulnerable MediaWiki instance.
Mitigation strategies for CVE-2020-29004 should prioritize immediate patching of the MediaWiki platform to version 1.35.2 or later, which contains the necessary fixes to enforce edit token validation in the Push extension's API implementation. Organizations should also implement additional security measures such as enabling proper CSRF protection mechanisms at the web application firewall level and monitoring API access patterns for suspicious activities. The fix addresses the root cause by implementing proper authentication checks in ApiPushBase.php, ensuring that all requests to the push notification API endpoints require valid edit tokens before processing any modifications. Security teams should conduct comprehensive audits of all installed MediaWiki extensions to identify similar vulnerabilities and ensure that proper token validation mechanisms are implemented across all API endpoints. This vulnerability demonstrates the critical importance of implementing robust authentication mechanisms in web applications and highlights the necessity of following security best practices such as those outlined in the OWASP Top Ten and NIST cybersecurity frameworks. The incident underscores the need for continuous security testing and validation of all API components to prevent unauthorized access and maintain the integrity of content management systems.