CVE-2009-1940 in Joomla
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the administrator panel in the com_users core component 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-2009-1940 vulnerability represents a critical cross-site scripting flaw within the Joomla versions 1.5.x through 1.5.10, making it a widespread concern for organizations utilizing these older versions of the platform. The flaw exists within the administrative interface where user management functions are handled, creating a pathway for malicious actors to execute unauthorized code within the context of administrator sessions.
The technical nature of this vulnerability stems from insufficient input validation and output sanitization within the user management component. Attackers can exploit this weakness by crafting malicious payloads that get executed when administrators view user-related information in the admin panel. The unspecified vectors suggest that multiple entry points within the component could be leveraged, potentially including user profile fields, username inputs, or other administrative data handling mechanisms. This lack of specificity in the vector description indicates a fundamental flaw in the component's security architecture rather than a single point of failure.
The operational impact of this vulnerability is severe as it allows remote attackers to hijack administrator sessions and potentially gain full control over the Joomla! installation. When administrators interact with compromised user data, the injected scripts execute in their browser context with elevated privileges, enabling attackers to perform actions such as creating new administrator accounts, modifying content, accessing sensitive data, or even installing malicious extensions. This vulnerability directly violates the principle of least privilege and undermines the security model of the CMS, as it allows attackers to operate with administrative rights without proper authentication.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to protect their Joomla 1.5.x, specifically version 1.5.11 or later, which contains the necessary patches to address this XSS vulnerability. Additionally, implementing proper input validation and output encoding mechanisms within custom extensions that interact with user data can help prevent similar issues. Security headers such as Content Security Policy should be configured to limit script execution and prevent unauthorized code injection. From a defensive perspective, this vulnerability aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation, and represents a technique commonly used in the ATT&CK framework under the Tactic of Execution and Persistence. Network monitoring should be enhanced to detect suspicious script injection patterns, and regular security audits should be conducted to identify other potential XSS vulnerabilities within the application stack.