CVE-2008-5942 in MODX
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in MODx before 0.9.6.3 allow remote attackers to inject arbitrary web script or HTML via vectors related to (1) the preserveUrls function and (2) "username input." NOTE: vector 2 may be related to CVE-2008-5939.
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Analysis
by VulDB Data Team • 04/18/2018
The vulnerability described in CVE-2008-5942 represents a critical security flaw in the MODx content management system prior to version 0.9.6.3, exposing the platform to multiple cross-site scripting attack vectors that could enable remote adversaries to execute malicious code within the context of user browsers. This vulnerability type falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the injection of arbitrary web script or HTML content that can compromise user sessions and data integrity. The flaw manifests through two distinct attack vectors that exploit insufficient input validation and output encoding mechanisms within the MODx application framework.
The first vulnerable vector involves the preserveUrls function, which appears to inadequately sanitize URL parameters that are processed within the application's URL handling mechanisms. This weakness allows attackers to inject malicious scripts through URL parameters that are not properly escaped or validated before being rendered in the browser context. The second vector targets username input fields, where user-provided authentication data fails to undergo proper sanitization before being processed or displayed within the application interface. This particular attack surface is particularly concerning as it could enable attackers to inject malicious content during user registration or login processes, potentially capturing credentials or executing unauthorized actions.
The operational impact of these vulnerabilities extends beyond simple script injection, as they create persistent security risks that can be exploited for session hijacking, credential theft, and unauthorized administrative access. When users interact with compromised pages containing malicious scripts, these scripts can execute in the context of their authenticated sessions, potentially allowing attackers to perform actions with the privileges of legitimate users. The attack surface is particularly dangerous because it can affect both regular users and administrators, potentially leading to complete system compromise if attackers can leverage these vulnerabilities to escalate privileges or gain persistent access to the CMS.
Security professionals should consider these vulnerabilities in the context of the MITRE ATT&CK framework, specifically categorizing them under the T1059.007 technique for Scripting and T1566.001 for Spearphishing Attachment, as they enable attackers to deliver malicious payloads through web-based interfaces. The remediation strategy should focus on implementing comprehensive input validation and output encoding mechanisms, particularly around URL parameter handling and user input fields. Organizations should ensure that all user-supplied data is properly sanitized using context-appropriate escaping techniques, implement Content Security Policy headers to limit script execution, and upgrade to MODx version 0.9.6.3 or later where these vulnerabilities have been addressed through improved input validation and sanitization routines. Additionally, regular security audits of web applications should include thorough testing for XSS vulnerabilities in all user input handling mechanisms to prevent similar issues from emerging in other components of the system.