CVE-2009-3636 in TYPO3
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Install Tool subcomponent in TYPO3 4.0.13 and earlier, 4.1.x before 4.1.13, 4.2.x before 4.2.10, and 4.3.x before 4.3beta2 allows remote attackers to inject arbitrary web script or HTML via unspecified parameters.
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Analysis
by VulDB Data Team • 04/26/2025
The CVE-2009-3636 vulnerability represents a critical cross-site scripting flaw within TYPO3's Install Tool subcomponent, affecting multiple version ranges including 4.0.13 and earlier, 4.1.x before 4.1.13, 4.2.x before 4.2.10, and 4.3.x before 4.3beta2. This vulnerability resides in the installation and configuration interface of the TYPO3 content management system, which serves as a critical administrative component for system setup and maintenance operations. The flaw specifically targets the Install Tool's parameter handling mechanisms, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of authenticated user sessions. The vulnerability's presence in the Install Tool is particularly concerning as this component typically operates with elevated privileges and administrative access rights, making it a prime target for attackers seeking to escalate their privileges or compromise the entire system.
The technical exploitation of this XSS vulnerability occurs through unspecified parameters within the Install Tool interface, which fail to properly sanitize or validate user input before rendering it in the web response. This lack of input validation creates a persistent injection vector where attackers can craft malicious payloads that get executed when legitimate users access the affected pages. The vulnerability's classification as a server-side XSS issue means that the malicious scripts can be executed in the context of the victim's browser session, potentially allowing attackers to steal session cookies, perform actions on behalf of users, or redirect them to malicious websites. The impact is amplified by the fact that the Install Tool typically requires administrative authentication, meaning that successful exploitation could lead to full system compromise.
The operational impact of CVE-2009-3636 extends beyond simple script injection, as it provides attackers with a potential foothold for more sophisticated attacks within TYPO3 environments. Attackers could leverage this vulnerability to establish persistent backdoors, modify system configurations, or exfiltrate sensitive data from the CMS. The vulnerability's presence in multiple version streams indicates a fundamental flaw in the parameter handling logic that persisted across several releases, suggesting a systemic issue in the codebase's input validation mechanisms. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws, and represents a classic example of how inadequate input sanitization can create security weaknesses in web applications. The attack surface is particularly dangerous because the Install Tool is often accessible during system initialization or maintenance operations, making it a high-value target for attackers seeking to compromise systems during critical deployment phases.
Organizations affected by this vulnerability should implement immediate mitigations including applying the relevant security patches released by TYPO3 for the affected versions, implementing proper input validation measures, and conducting comprehensive security assessments of their TYPO3 installations. Network-level protections such as web application firewalls and content filtering systems can provide additional layers of defense, though these should not replace proper code-level fixes. The vulnerability demonstrates the critical importance of input validation and output encoding in web applications, as recommended by OWASP best practices and aligned with ATT&CK technique T1059.1001 for command and scripting interpreter. System administrators should also consider implementing principle of least privilege access controls for the Install Tool, restricting access to trusted administrative users only and monitoring for suspicious activities in the installation interfaces. Regular security audits and penetration testing of CMS installations are essential to identify similar vulnerabilities and maintain overall system security posture.