CVE-2002-2231 in Ikonboard
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Ikonboard 3.1.1 allows remote attackers to inject arbitrary web script or HTML via (1) a javascript: URL in a photo URL or (2) an X-Forwarded-For: header.
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Analysis
by VulDB Data Team • 06/11/2018
The CVE-2002-2231 vulnerability represents a critical cross-site scripting flaw discovered in Ikonboard version 3.1.1, a popular web-based bulletin board system that was widely deployed in the early 2000s. This vulnerability exposes the application to remote code execution through malicious script injection, potentially allowing attackers to compromise user sessions and access sensitive data. The flaw specifically manifests in two distinct attack vectors that leverage the application's improper input validation mechanisms, making it particularly dangerous as it can be exploited through multiple entry points without requiring authentication.
The technical implementation of this vulnerability stems from inadequate sanitization of user-supplied input within the application's photo URL handling and HTTP header processing components. When a user submits a photo URL containing a javascript: protocol scheme, the system fails to properly validate or escape the input before rendering it in the web page context. Similarly, the X-Forwarded-For header, which is commonly used to track client IP addresses in proxy environments, becomes a vector for injection attacks when the application does not properly sanitize this header data. Both attack vectors fall under the category of reflected cross-site scripting as defined by CWE-79, where malicious scripts are reflected off the web server to the victim's browser. The vulnerability is particularly concerning because it bypasses traditional security controls and can be exploited through legitimate application functionality.
The operational impact of this vulnerability extends beyond simple script injection, creating potential pathways for session hijacking, credential theft, and data exfiltration. Attackers can craft malicious URLs or manipulate HTTP headers to execute scripts that steal cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users. The reflected nature of the attack means that victims must be tricked into clicking malicious links or visiting compromised web pages, making social engineering a critical component of exploitation. This vulnerability directly aligns with ATT&CK technique T1566.001 for Phishing and T1071.004 for Application Layer Protocol: DNS, as attackers can leverage these vectors to establish persistent access to user sessions and compromise the integrity of the web application. The widespread adoption of Ikonboard at the time meant that numerous websites and forums were potentially vulnerable to this attack, creating a significant risk landscape for organizations relying on this platform.
Mitigation strategies for CVE-2002-2231 require immediate implementation of input validation and output encoding measures across all user-supplied data points. Organizations should implement comprehensive sanitization of all HTTP headers, particularly X-Forwarded-For, and ensure that any URL parameters containing javascript: schemes are properly validated and escaped before rendering. The application should enforce strict content type validation for photo URLs and implement proper HTML encoding for all dynamic content. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of protection against script injection attacks by restricting the sources from which scripts can be loaded. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other components of the application. The vulnerability demonstrates the critical importance of defense-in-depth strategies and proper input validation practices, as outlined in OWASP Top 10 2021 category A03: Injection, which emphasizes the need for robust sanitization of all user inputs to prevent various injection attacks including XSS. Organizations should also consider implementing Web Application Firewalls (WAFs) to provide additional protection against known attack patterns and ensure that all legacy applications are properly patched or migrated to more secure platforms.