MediaWiki is a widely used platform for creating and managing collaborative wiki websites, developed and maintained by the Wikimedia Foundation. It is designed to allow multiple users to contribute to content development and editing. MediaWiki's extension, EasyTimeline, enables users to create timelines within wiki pages using simple markup. Organizations of all sizes use MediaWiki for documentation, knowledge management, and educational resources due to its flexibility and ease of use. The software is popular in both academic and enterprise environments, often powering both public-facing and internal knowledge bases.
The vulnerability in question, Remote Code Execution (RCE), poses a significant security risk as it allows an attacker to execute arbitrary code on a server or application. In the context of MediaWiki EasyTimeline, the vulnerability arises from improper neutralization of newline characters in user-submitted timeline markup. This can lead to unauthorized command execution if an attacker can create or modify timeline content. Such vulnerabilities can severely compromise affected systems, potentially leading to data breaches, system takeovers, or disruption of services.
The RCE vulnerability in the MediaWiki EasyTimeline extension exists in versions prior to 1.46.0, 1.45.4, 1.44.6, and 1.43.9. It occurs due to the ability of malicious timeline markup to inject ploticus directives, exploiting the lack of an isolating "-noshell" flag in ploticus invocation. Vulnerable endpoints include timeline rendering processes, where attackers can submit crafted timeline blocks with harmful directives. This exploitability necessitates sufficient user privileges, typically found on wikis allowing anonymous or readily available user edit access.
If exploited, this vulnerability could lead to the execution of arbitrary operating system commands within the context of the MediaWiki EasyTimeline and ploticus process. The implications of such an exploit include unauthorized access to sensitive data, full host compromise, and potential spread within the network, particularly if the affected timeline is not isolated from other system components.
REFERENCES
- Upgrade to MediaWiki EasyTimeline extension version 1.46.0, 1.45.4, 1.44.6, or 1.43.9, or later.
- Disable the EasyTimeline extension if upgrading is not feasible, particularly when running outside isolated environments.
- Implement access control measures to restrict anonymous or unauthorized editing.
- Regularly audit user permissions and apply the principle of least privilege.
- Monitor and log timeline submissions for any unusual activities indicative of exploitation attempts.
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