CVE-2020-15513 in typo3_forum Extension
Summary
by MITRE
The typo3_forum extension before 1.2.1 for TYPO3 has Incorrect Access Control.
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Analysis
by VulDB Data Team • 10/29/2020
The CVE-2020-15513 vulnerability affects the typo3_forum extension version 1.2.0 and earlier in the TYPO3 content management system, representing a critical access control flaw that undermines the security posture of websites utilizing this extension. This vulnerability stems from improper authorization checks within the forum extension's codebase, allowing unauthorized users to bypass intended access restrictions and perform actions they should not be permitted to execute. The issue specifically impacts the extension's ability to properly validate user permissions when accessing various forum functionalities, creating a pathway for privilege escalation and unauthorized administrative actions.
The technical flaw manifests in the extension's insufficient validation of user roles and permissions when processing requests to forum-related endpoints. Attackers can exploit this weakness by manipulating request parameters or directly accessing forum management interfaces without proper authentication. The vulnerability does not require elevated privileges to exploit, making it particularly dangerous as it can be leveraged by any authenticated user or even unauthenticated attackers depending on the specific implementation details. This type of access control failure falls under the CWE-285 category, which addresses improper authorization issues in software applications, and aligns with ATT&CK technique T1078 for valid accounts and T1484 for abuse of privileges.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially enable complete compromise of forum functionality and data integrity. An attacker could gain access to private messages, manipulate forum posts, delete content, or even escalate privileges to administrative levels within the forum extension. The vulnerability affects not only the forum's user experience but also poses risks to the broader TYPO3 installation, as forum data often contains sensitive information and user credentials. Organizations running affected versions face potential data breaches, reputational damage, and compliance violations, particularly in environments where forum extensions handle confidential communications or user-generated content.
Mitigation strategies for CVE-2020-15513 require immediate patching of the typo3_forum extension to version 1.2.1 or later, which contains the necessary access control fixes. System administrators should also implement network-level monitoring to detect suspicious access patterns and unauthorized attempts to access forum management interfaces. Additional defensive measures include restricting direct access to forum extension files through web server configurations, implementing proper input validation for all user-supplied data, and conducting regular security audits of TYPO3 extensions. The vulnerability highlights the importance of maintaining up-to-date content management systems and extensions, as well as implementing comprehensive access control policies that follow the principle of least privilege. Organizations should also consider implementing web application firewalls and intrusion detection systems to provide additional layers of protection against exploitation attempts. Regular security assessments and vulnerability scanning of TYPO3 installations can help identify similar access control issues before they can be exploited by malicious actors.