CVE-2006-3756 in Geeklog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Geeklog 1.4.0sr4 and earlier, and 1.3.11sr6 and earlier, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors when validating comments in (1) lib-comment.php (1.4.0sr4) or (2) comment.php (0.3.11sr6).
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Analysis
by VulDB Data Team • 08/04/2019
This cross-site scripting vulnerability exists in Geeklog content management systems version 1.4.0sr4 and earlier, as well as version 1.3.11sr6 and earlier, representing a critical security flaw that enables remote attackers to execute malicious scripts within the context of users' browsers. The vulnerability specifically manifests during comment validation processes in two distinct files: lib-comment.php in version 1.4.0sr4 and comment.php in version 0.3.11sr6, making it a widespread issue affecting multiple versions of the platform. The flaw allows attackers to inject arbitrary web scripts or HTML content through unspecified vectors, creating a persistent threat that can compromise user sessions and potentially lead to account takeovers.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization within the comment handling mechanisms of the Geeklog system. When users submit comments through the affected versions, the system fails to properly sanitize or escape user-supplied data before rendering it on web pages. This lack of proper data sanitization creates an environment where malicious actors can embed javascript code, html tags, or other malicious payloads that execute in the browsers of other users who view the compromised comments. The vulnerability operates at the application layer and follows the CWE-79 pattern for cross-site scripting, specifically categorized as CWE-79 Cross-site Scripting (XSS) - Generic, which represents a fundamental weakness in web application security.
The operational impact of this vulnerability extends beyond simple script injection, potentially allowing attackers to perform session hijacking, deface websites, steal sensitive user information, or redirect users to malicious sites. Attackers can exploit this flaw to create persistent XSS payloads that remain active until the affected comments are deleted or the system is updated. The vulnerability affects the core functionality of the commenting system, which is a fundamental feature of many Geeklog installations, making it particularly dangerous as it can be exploited by anyone with access to the commenting interface. This vulnerability aligns with ATT&CK technique T1566.001 for Initial Access through Spearphishing Attachment, where attackers can use the XSS vulnerability to deliver malicious payloads to users.
Mitigation strategies should focus on immediate patching of affected Geeklog versions to the latest secure releases, which would address the underlying input validation issues. Organizations should implement comprehensive input sanitization and output encoding measures, particularly for user-generated content in comment systems. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting script execution sources. Regular security audits of web applications should include thorough testing of input validation mechanisms, particularly in areas handling user comments and other dynamic content. The vulnerability also highlights the importance of following secure coding practices and implementing proper data sanitization techniques, which aligns with OWASP Top Ten security controls and the principle of defense in depth. System administrators should monitor for any exploitation attempts and consider implementing web application firewalls to detect and block suspicious comment submissions.