CVE-2006-3211 in cjGuestbook
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in sign.php in cjGuestbook 1.3 and earlier allows remote attackers to inject Javascript code via a javascript URI in an img bbcode tag in the comments parameter.
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Analysis
by VulDB Data Team • 07/29/2018
The vulnerability described in CVE-2006-3211 represents a classic cross-site scripting flaw affecting cjGuestbook version 1.3 and earlier. This security weakness resides within the sign.php script which processes guestbook comments and fails to properly sanitize user input containing bbcode formatted image tags. The flaw specifically manifests when attackers exploit the comments parameter to inject malicious javascript code through a javascript URI embedded within an img bbcode tag structure.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the guestbook application. When users submit comments containing bbcode tags such as [img]http://malicious-site.com/image.jpg[/img], the application processes these inputs without proper sanitization of the URI content. This allows attackers to craft malicious payloads where the javascript URI becomes part of the img tag's src attribute, bypassing standard security filters. The vulnerability specifically targets the comments parameter processing mechanism, which does not adequately validate or escape javascript protocols within image source attributes.
From an operational perspective, this XSS vulnerability creates significant security implications for websites utilizing cjGuestbook. Attackers can exploit this flaw to execute arbitrary javascript code within the context of other users' browsers, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The remote nature of this attack means that victims need only view the affected guestbook page to be compromised, making it particularly dangerous for public-facing web applications. The vulnerability affects the core functionality of the guestbook system by allowing persistent malicious content injection that can compromise user sessions and data integrity.
The security impact of CVE-2006-3211 aligns with CWE-79 which describes improper neutralization of input during web page generation, specifically focusing on cross-site scripting vulnerabilities. This classification emphasizes the fundamental flaw in how the application handles user-supplied data during HTML generation processes. The attack vector follows patterns consistent with the ATT&CK framework's web application attacks category, particularly the technique of injecting malicious scripts through user input fields. The vulnerability demonstrates poor input validation practices that violate secure coding principles and web application security best practices established by organizations like OWASP.
Mitigation strategies for this vulnerability require immediate implementation of proper input sanitization and output encoding mechanisms. The application should validate all user-supplied content to reject or escape javascript protocols within URI attributes, particularly within image tag sources. Implementing Content Security Policy headers can provide additional defense-in-depth measures to prevent execution of unauthorized scripts. Regular security updates and patch management are essential, as this vulnerability was addressed in later versions of cjGuestbook. Organizations should also implement web application firewalls to detect and block suspicious input patterns, and conduct regular security testing to identify similar input validation weaknesses in other application components.