CVE-2009-1939 in Joomla
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the JA_Purity template for Joomla! 1.5.x through 1.5.10 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 08/11/2021
The CVE-2009-1939 vulnerability represents a critical cross-site scripting flaw within the JA_Purity template for Joomla content management system's template rendering mechanism, where user-supplied input is not properly sanitized before being incorporated into web page output. The vulnerability exists in the JA_Purity template, which is a popular frontend template for Joomla! installations, making it particularly dangerous as it affects a widely deployed component of the CMS ecosystem.
The technical flaw manifests when the template fails to adequately validate and escape user input that gets rendered in web pages. Attackers can exploit this weakness by injecting malicious scripts or HTML code through unspecified vectors within the template's processing logic. These vectors typically involve parameters or input fields that are processed by the template engine without proper sanitization measures. The vulnerability allows remote attackers to execute arbitrary web scripts in the context of other users' browsers, potentially leading to session hijacking, credential theft, or defacement of websites. The attack requires no privileged access and can be executed through simple web requests that embed malicious payloads in template parameters or content fields.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable sophisticated attacks within the Joomla installations were potentially vulnerable, creating a significant attack surface for threat actors. This vulnerability particularly affects web applications where user-generated content is displayed without proper input validation, and it highlights the critical importance of sanitizing all user-supplied data in web applications. The attack vector is particularly concerning because it can be leveraged through legitimate user interactions with the CMS interface, making detection and prevention more challenging.
Mitigation strategies for CVE-2009-1939 should include immediate patching of affected Joomla! installations to version 1.5.11 or later, which contains the necessary security fixes. Organizations should also implement proper input validation and output encoding mechanisms to prevent similar vulnerabilities in custom templates and extensions. The implementation of Content Security Policy headers can provide additional defense-in-depth measures against XSS attacks. Security monitoring should include regular vulnerability assessments of template components and third-party extensions. The vulnerability demonstrates the importance of maintaining up-to-date CMS installations and the principle that template components, while seemingly innocuous, can represent significant security risks when not properly secured. This case underscores the ATT&CK framework's relevance in understanding how template-based vulnerabilities can be exploited as initial access vectors in broader attack chains, particularly through the use of web application exploitation techniques that leverage XSS for persistent access to compromised systems.