CVE-2010-0339 in Vm19 Userlinks
Summary
by MITRE
SQL injection vulnerability in the User Links (vm19_userlinks) extension 0.1.1 and earlier for TYPO3 allows remote attackers to execute arbitrary SQL commands via unspecified vectors.
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Analysis
by VulDB Data Team • 04/11/2025
The CVE-2010-0339 vulnerability represents a critical SQL injection flaw within the User Links extension for TYPO3 content management system. This vulnerability affects versions 0.1.1 and earlier, specifically targeting the vm19_userlinks extension which was designed to manage user-generated links within TYPO3 installations. The flaw resides in how the extension processes user input, creating an exploitable condition that allows remote attackers to inject malicious SQL commands directly into the database layer. The vulnerability is particularly concerning as it operates without requiring authentication, making it accessible to any remote attacker who can interact with the vulnerable TYPO3 instance.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the User Links extension. When users interact with the extension's functionality, particularly when submitting or processing link-related data, the extension fails to properly escape or parameterize user-supplied input before incorporating it into SQL queries. This lack of proper input handling creates a direct pathway for attackers to manipulate the underlying database queries through crafted malicious input. The unspecified vectors mentioned in the description suggest that multiple entry points within the extension could potentially be exploited, including form submissions, URL parameters, or API endpoints that process user link data. This broad attack surface increases the likelihood of successful exploitation across different TYPO3 configurations and deployment scenarios.
The operational impact of CVE-2010-0339 extends far beyond simple data theft, as successful exploitation can lead to complete database compromise and potential system takeover. Attackers can execute arbitrary SQL commands which may result in unauthorized data access, modification, or deletion across the entire TYPO3 database. The vulnerability could enable attackers to extract sensitive information including user credentials, personal data, and administrative access details stored within the CMS. In more severe scenarios, the attacker might gain the ability to modify website content, install malicious software, or establish persistent backdoors within the TYPO3 environment. The remote execution capability means that attackers do not need physical access to the server, making this vulnerability particularly dangerous for publicly accessible web applications. This aligns with CWE-89 which classifies SQL injection as a critical weakness in software applications that fail to properly sanitize user input before executing database queries.
Security professionals should consider this vulnerability in the context of the ATT&CK framework, specifically under the technique of "Querying Databases" and "Data Manipulation" which are commonly used in post-exploitation phases. The vulnerability directly maps to the broader category of injection flaws and demonstrates how legacy extensions can create persistent security risks within CMS environments. Organizations running affected TYPO3 installations should immediately implement mitigations including upgrading to patched versions of the vm19_userlinks extension, implementing web application firewalls to detect and block SQL injection attempts, and conducting comprehensive security assessments of all installed extensions. Database access controls should be reviewed to ensure that application users have minimal required privileges, and input validation should be strengthened across all user-facing interfaces. The vulnerability also highlights the importance of maintaining up-to-date security practices and the need for continuous monitoring of third-party extensions for known security issues. Additionally, organizations should consider implementing database activity monitoring and anomaly detection systems to identify potential exploitation attempts and provide early warning capabilities against similar vulnerabilities in other components of their web infrastructure.