CVE-2008-6888 in Classified Listings
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in signup.asp in Pre Classified Listings 1.0 allows remote attackers to inject arbitrary web script or HTML via the address parameter.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2008-6888 represents a critical cross-site scripting flaw within the Pre Classified Listings 1.0 web application, specifically affecting the signup.asp component. This vulnerability resides in the handling of user input through the address parameter, which fails to properly sanitize or validate incoming data before processing. The flaw enables remote attackers to execute malicious scripts within the context of other users' browsers, creating a significant security risk for the application's user base. The vulnerability classification aligns with CWE-79 which specifically addresses cross-site scripting weaknesses in web applications where untrusted data is improperly incorporated into web pages without adequate validation or escaping mechanisms.
The technical implementation of this vulnerability stems from the application's failure to implement proper input validation and output encoding for the address parameter in the signup process. When users submit their address information through the signup.asp form, the application processes this data without sufficient sanitization measures, allowing malicious payloads to be stored or executed. Attackers can craft specially formatted address inputs containing HTML tags or javascript code that gets executed when other users view the affected data. This type of vulnerability typically occurs when developers assume that user input will be benign and fail to implement proper data sanitization or context-appropriate escaping mechanisms for web content. The vulnerability operates under the principle that user-supplied data should never be trusted and must always be validated and encoded before being rendered in web contexts.
The operational impact of this vulnerability extends beyond simple data corruption, creating potential avenues for session hijacking, credential theft, and further exploitation within the application's user environment. An attacker could inject malicious scripts that steal cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users. The vulnerability affects the entire user base of the classified listings platform, as any user whose address information is stored and subsequently displayed could become a victim of the injected scripts. This creates a persistent threat that remains active until the vulnerability is patched, potentially allowing attackers to establish long-term access to the application's user data and session information. The vulnerability also undermines user trust in the platform and could result in significant reputational damage and potential legal consequences for the organization.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data handling processes. The most effective immediate solution involves implementing proper parameter validation for all user-supplied input, particularly the address field, using allow-list validation techniques that only permit expected character sets and formats. Additionally, the application should employ context-appropriate output encoding before rendering any user data in web pages, ensuring that HTML and javascript characters are properly escaped. The implementation should follow secure coding practices as recommended by the OWASP Top Ten and the CWE guidelines for preventing cross-site scripting vulnerabilities. Organizations should also consider implementing a web application firewall to provide additional protection layers and establish regular security testing procedures to identify similar vulnerabilities in other application components. The remediation process must include thorough code review of all input handling mechanisms and comprehensive testing to ensure that the vulnerability is fully resolved without introducing new security issues.