CVE-2006-3212 in cjGuestbook
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in sign.php in cjGuestbook 1.3 and earlier allows remote attackers to inject web script or HTML via the (1) name, (2) email, (3) add, and (4) wName parameters. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 07/29/2018
The vulnerability described in CVE-2006-3212 represents a classic cross-site scripting flaw affecting cjGuestbook version 1.3 and earlier implementations. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security issues. The vulnerability specifically resides in the sign.php component of the guestbook application, making it accessible through multiple input vectors that collectively expand the attack surface.
The technical implementation of this XSS vulnerability occurs when the application fails to properly sanitize or encode user-supplied input before incorporating it into dynamically generated web pages. Attackers can exploit this weakness by submitting malicious payloads through four distinct parameters: name, email, add, and wName. These parameters are processed by the sign.php script without adequate input validation or output encoding mechanisms, allowing malicious scripts to be executed within the context of other users' browsers. The vulnerability is particularly concerning because it affects multiple input fields, increasing the probability of successful exploitation.
The operational impact of this vulnerability extends beyond simple data theft or defacement. When an attacker successfully injects malicious script code through any of these parameters, they can execute arbitrary JavaScript in the victim's browser session. This capability enables a wide range of malicious activities including session hijacking, credential theft, redirection to malicious sites, and data exfiltration. The vulnerability creates a persistent threat vector where compromised users may unknowingly execute attacker-controlled code whenever they view the guestbook entries, making it a significant risk for any website utilizing this vulnerable software.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1566.001 for initial access through malicious inputs and T1059.007 for command and control through script execution. The attack chain typically involves an attacker identifying the vulnerable parameters, crafting malicious payloads that bypass basic input filtering, and then persuading victims to view the compromised guestbook entries. The low complexity of exploitation makes this vulnerability particularly dangerous in environments where users may trust the guestbook functionality and regularly interact with entries containing malicious code.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding practices. The most effective approach involves sanitizing all user inputs through proper encoding before rendering them in web pages, particularly using context-appropriate encoding such as HTML entity encoding for web page content. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of protection by restricting script execution within the application. The remediation process should also include upgrading to a patched version of cjGuestbook or migrating to a more secure guestbook solution that properly implements security controls against XSS attacks. Regular security testing and input validation reviews should be conducted to prevent similar vulnerabilities from emerging in other application components.
The vulnerability demonstrates the critical importance of input validation in web application security, as highlighted by the OWASP Top Ten Project's emphasis on injection flaws. Organizations should implement a defense-in-depth strategy that includes both server-side input sanitization and client-side security measures to protect against this type of persistent threat. The incident underscores the necessity of maintaining up-to-date software components and implementing proper security testing procedures to identify and remediate vulnerabilities before they can be exploited in real-world scenarios.