CVE-2007-5218 in DRBGuestbook
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in Don Barnes DRBGuestbook 1.1.13 allows remote attackers to inject arbitrary web script or HTML via the action parameter.
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Analysis
by VulDB Data Team • 08/09/2025
The CVE-2007-5218 vulnerability represents a classic cross-site scripting flaw within the DRBGuestbook 1.1.13 web application developed by Don Barnes. This vulnerability specifically targets the index.php script where user input is not properly sanitized or validated before being rendered back to web browsers. The flaw exists in the handling of the action parameter which serves as an entry point for malicious input injection. When users interact with the guestbook application and provide input through the action parameter, the application fails to implement adequate input validation mechanisms that would normally prevent malicious scripts from being executed in the context of other users' browsers.
The technical implementation of this vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications. This weakness allows attackers to inject malicious HTML or JavaScript code into web pages viewed by other users, creating a persistent threat vector that can be exploited across multiple sessions and user interactions. The vulnerability operates at the application layer where user-supplied data flows directly into the web response without proper sanitization or encoding. The action parameter serves as the primary attack vector since it likely controls various application functions such as form submissions, navigation, or data processing operations that are then reflected back to users.
The operational impact of this vulnerability extends beyond simple script injection to potentially enable more sophisticated attacks including session hijacking, credential theft, and data exfiltration. An attacker could craft malicious payloads that steal session cookies, redirect users to malicious sites, or manipulate the guestbook interface to display fraudulent content. The vulnerability affects all users of the DRBGuestbook application who are exposed to the reflected XSS payload, making it particularly dangerous in environments where guestbooks are used for public interaction or community engagement. When combined with other techniques such as social engineering, attackers can amplify the impact of this vulnerability to compromise multiple user accounts and gain unauthorized access to the application's functionality.
Mitigation strategies for CVE-2007-5218 should focus on implementing comprehensive input validation and output encoding mechanisms. The most effective approach involves sanitizing all user-supplied input through proper validation routines that reject or escape potentially dangerous characters and script tags. Implementing Content Security Policy headers can provide additional protection by restricting the sources from which scripts can be loaded and executed within the application context. The vulnerability also highlights the importance of regular security audits and code reviews to identify similar input handling issues that may exist in other parts of the application. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to T1059.007 for script injection techniques and T1566 for social engineering approaches that may leverage such vulnerabilities to compromise user sessions and access credentials through the reflected XSS vector.