CVE-2012-5103 in Gelinsguestbook
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in action/add-submit.php in Ggb Guestbook 0.3.1 allow remote attackers to inject arbitrary web script or HTML via the (1) url or (2) message parameter.
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Analysis
by VulDB Data Team • 02/22/2019
The CVE-2012-5103 vulnerability represents a critical cross-site scripting flaw discovered in the Ggb Guestbook 0.3.1 web application, specifically within the action/add-submit.php file. This vulnerability exposes the application to remote code execution risks through user input manipulation, making it a significant concern for web application security. The flaw affects two primary input parameters: url and message, both of which are processed without proper sanitization or validation, creating exploitable entry points for malicious actors. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as one of the top ten web application security risks by the OWASP Top Ten Project. This particular implementation represents a classic reflected XSS vulnerability where malicious scripts are injected into web pages viewed by other users.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing HTML or JavaScript code within either the url or message parameters of the guestbook submission form. When the vulnerable application processes this input and displays it back to other users without proper output encoding or validation, the injected scripts execute in the victims' browsers. This creates a persistent threat where legitimate users who view the guestbook entries containing malicious code become unwitting participants in the attack. The vulnerability demonstrates poor input validation practices and inadequate output sanitization mechanisms, which are fundamental security controls that should be implemented at every layer of web application development. According to ATT&CK framework, this vulnerability maps to T1059.008 (Command and Scripting Interpreter: PowerShell) and T1566.001 (Phishing: Spearphishing Attachment) as attackers can leverage this flaw to deliver malicious payloads through social engineering campaigns.
The operational impact of CVE-2012-5103 extends beyond simple script injection, potentially enabling attackers to perform session hijacking, steal user credentials, redirect victims to malicious sites, or even execute more sophisticated attacks through browser-based exploits. The vulnerability affects the integrity and confidentiality of user data, as malicious actors can capture session cookies, personal information, or other sensitive data submitted through the guestbook interface. Organizations using this vulnerable application face significant risks including data breaches, reputational damage, and potential compliance violations under regulations such as GDPR or HIPAA. The attack vector is particularly concerning because guestbook applications are often publicly accessible and may be used by multiple users, amplifying the potential impact of a successful exploitation. Security professionals should note that this vulnerability represents a common pattern in legacy web applications where security considerations were not adequately addressed during development phases.
Mitigation strategies for CVE-2012-5103 require immediate implementation of proper input validation and output encoding techniques. The recommended approach includes implementing strict parameter validation for all user inputs, particularly those that are displayed back to users in web pages. This involves sanitizing all input data using whitelisting techniques and applying appropriate HTML encoding to prevent script execution in the browser context. Organizations should also consider implementing Content Security Policy (CSP) headers to add an additional layer of protection against XSS attacks. The vulnerability underscores the importance of following secure coding practices as outlined in the OWASP Secure Coding Practices and the principle of defense in depth. Regular security assessments, including automated vulnerability scanning and manual penetration testing, should be conducted to identify similar issues in other applications. Patch management procedures must be established to ensure timely updates of vulnerable components, and developers should receive training on secure coding practices to prevent similar vulnerabilities from being introduced in future development cycles. The remediation process should include thorough code review of all input handling mechanisms and implementation of proper error handling to prevent information disclosure that could aid further exploitation attempts.