CVE-2006-6372 in JAB Guest Book
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in pbguestbook.php in JAB Guest Book 20061205 allow remote attackers to inject arbitrary web script or HTML via the (1) topic or (2) message parameter. 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 • 10/02/2017
The vulnerability described in CVE-2006-6372 represents a critical cross-site scripting flaw affecting the JAB Guest Book application version 20061205. This type of vulnerability falls under the Common Weakness Enumeration category CWE-79 which specifically addresses improper neutralization of input during web page generation, making it a classic example of insecure data handling in web applications. The vulnerability exists within the pbguestbook.php script where user-supplied input is not properly sanitized or validated before being rendered back to web browsers.
The technical implementation of this vulnerability allows attackers to inject malicious scripts through two primary input vectors: the topic parameter and the message parameter. When users submit entries containing malicious code through these fields, the application fails to properly escape or encode the input data before displaying it on the guest book page. This creates an environment where any user visiting the affected page could be exposed to the injected scripts, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability's impact is particularly concerning as it affects the core functionality of the guest book system where users naturally expect to enter content without security concerns.
From an operational standpoint, this vulnerability presents significant risks to web application security and user privacy. The ability to inject arbitrary web script or HTML means attackers could execute various malicious payloads including but not limited to stealing cookies, redirecting users to phishing sites, defacing the guest book content, or even establishing persistent backdoors through more sophisticated attack vectors. The attack requires minimal technical expertise and can be executed remotely, making it particularly dangerous for public-facing web applications. The lack of known provenance information suggests this vulnerability may have been discovered through automated scanning tools or community reporting rather than formal security research channels.
The mitigation strategies for this vulnerability should focus on implementing proper input validation and output encoding techniques. Developers must ensure that all user-supplied data is sanitized before being processed or displayed, utilizing established encoding methods such as HTML entity encoding for output rendering. The principle of least privilege should be applied to input handling, where only expected characters and formats are accepted. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting script execution. Security teams should also consider deploying web application firewalls to monitor and block suspicious input patterns. This vulnerability aligns with ATT&CK technique T1566 which covers social engineering through malicious content injection, demonstrating how such flaws can be exploited to manipulate user behavior and compromise system security. Regular security audits and input validation testing should be implemented to prevent similar vulnerabilities in future iterations of the application.