CVE-2002-0962 in GeekLog
Summary
by MITRE
Cross-site scripting vulnerabilities in GeekLog 1.3.5 and earlier allow remote attackers to execute arbitrary script via (1) the url variable in the Link field of a calendar event, (2) the topic parameter in index.php, or (3) the title parameter in comment.php.
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Analysis
by VulDB Data Team • 01/08/2025
The vulnerability identified as CVE-2002-0962 represents a critical cross-site scripting flaw affecting GeekLog versions 1.3.5 and earlier, demonstrating a classic web application security weakness that has persisted across decades of software development. This vulnerability falls under the Common Weakness Enumeration category CWE-79 which specifically addresses improper neutralization of input during web page generation, making it a prime example of how insufficient output encoding can lead to severe security consequences in content management systems. The flaw manifests in three distinct attack vectors within the GeekLog platform, each representing a different entry point where malicious input can be injected into web pages without proper sanitization.
The technical implementation of this vulnerability exploits the lack of proper input validation and output encoding mechanisms within the GeekLog application's handling of user-supplied data. When attackers manipulate the url variable in the Link field of calendar events, they can inject malicious javascript code that executes in the context of other users' browsers when the calendar event is displayed. Similarly, the topic parameter in index.php and the title parameter in comment.php provide additional attack surfaces where script injection can occur, allowing threat actors to leverage these parameters to bypass normal security controls. The vulnerability is particularly dangerous because it affects core functionality elements of the platform including event management, topic selection, and comment submission, making it accessible through common user interactions.
The operational impact of CVE-2002-0962 extends beyond simple script execution to potentially enable more sophisticated attacks including session hijacking, credential theft, and redirection to malicious sites. Attackers could craft malicious calendar events with embedded scripts that steal cookies from authenticated users, effectively compromising their sessions and gaining unauthorized access to the GeekLog application. The vulnerability also enables phishing attacks where users might be redirected to malicious sites that appear legitimate, or social engineering campaigns that leverage the trust users place in the platform's content. From an attacker's perspective, this vulnerability operates at the application layer and can be exploited without requiring special privileges or advanced technical knowledge, making it particularly attractive for automated exploitation campaigns.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms across all user-supplied parameters. The most effective approach involves sanitizing all input data before processing and ensuring that any user-generated content is properly escaped when rendered in web pages. Organizations should implement content security policies that restrict script execution and utilize parameterized queries to prevent injection attacks. The remediation process requires updating to GeekLog versions that address these vulnerabilities, as well as implementing web application firewalls and security monitoring systems to detect and prevent exploitation attempts. Additionally, regular security assessments and code reviews should be conducted to identify similar weaknesses in other applications, with particular attention to the ATT&CK framework's T1059.007 technique for script injection and T1531 for credential access through session manipulation. The vulnerability serves as a historical example of why proper input validation and output encoding remain fundamental security practices in web application development, with modern security frameworks emphasizing the need for defense-in-depth strategies that protect against such persistent attack vectors.