CVE-2006-2991 in Ringlink
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Ringlink 3.2 allow remote attackers to inject arbitrary web script or HTML via a JavaScript URI in the SRC attribute of an IMG element, and possibly other manipulations, in the ringid parameter in (1) next.cgi, (2) stats.cgi, or (3) list.cgi.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/29/2018
The vulnerability described in CVE-2006-2991 represents a critical cross-site scripting flaw affecting Ringlink 3.2 web application software. This vulnerability resides within the input validation mechanisms of the application's core components, specifically manifesting in three distinct CGI scripts that process user-supplied data. The security weakness stems from insufficient sanitization of user inputs, particularly when processing the ringid parameter through next.cgi, stats.cgi, and list.cgi endpoints. Attackers can exploit this vulnerability by crafting malicious payloads that leverage the SRC attribute of IMG elements, enabling them to inject JavaScript URIs that execute arbitrary code within the victim's browser context.
The technical exploitation of this vulnerability follows a pattern that aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities in web applications. The flaw operates by permitting unfiltered user input to be directly embedded into web page responses without proper encoding or validation. When the ringid parameter is processed through any of the three affected CGI scripts, the application fails to sanitize the input, allowing attackers to inject malicious JavaScript code that gets executed in the context of legitimate users' browsers. This particular attack vector leverages the IMG element's SRC attribute, which is commonly accepted in HTML forms, making it an effective method for bypassing traditional security filters that might not adequately inspect image source attributes.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with the capability to perform various malicious activities including session hijacking, credential theft, and redirection to malicious sites. The attack surface is particularly concerning because it affects multiple application endpoints, increasing the likelihood of successful exploitation. An attacker could potentially manipulate the application's functionality to redirect users to phishing sites, steal session cookies, or even modify application behavior through injected scripts. The vulnerability's persistence across three different CGI scripts indicates a systemic flaw in the application's input handling architecture, suggesting that similar issues might exist in other parameters or components of the Ringlink 3.2 application.
Mitigation strategies for this vulnerability should focus on comprehensive input validation and output encoding practices that align with established security frameworks. The most effective immediate fix involves implementing strict validation of all user-supplied input, particularly parameters that are directly rendered in web responses. The application should employ proper HTML encoding of all output data to prevent script execution in browser contexts, following the principles outlined in the OWASP Top Ten security guidelines. Additionally, the implementation of Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Organizations should also consider implementing web application firewalls that can detect and block malicious patterns in incoming requests. The remediation process should include thorough code reviews of all CGI scripts to identify and address similar input validation weaknesses, as well as regular security testing to ensure that similar vulnerabilities do not persist in other parts of the application. This vulnerability demonstrates the importance of defense-in-depth strategies and the critical need for comprehensive security testing throughout the software development lifecycle, particularly in applications handling user-generated content. The ATT&CK framework categorizes this type of vulnerability under the 'Command and Control' and 'Execution' phases, highlighting its potential for enabling further malicious activities within compromised systems.