CVE-2007-3131 in Light Blog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in add_comment.php in Light Blog 4.1 before 20070606 allows remote attackers to inject arbitrary web script or HTML via the id parameter.
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Analysis
by VulDB Data Team • 10/28/2017
The vulnerability identified as CVE-2007-3131 represents a classic cross-site scripting flaw within the Light Blog 4.1 content management system, specifically in the add_comment.php component. This issue arises from inadequate input validation and output sanitization mechanisms that fail to properly filter malicious user-supplied data before processing. The vulnerability is particularly concerning as it affects the comment submission functionality, which is a core interactive element of the blogging platform. Attackers can exploit this weakness by crafting malicious scripts or HTML code within the id parameter, which then gets executed in the context of other users' browsers when they view the affected comments. The vulnerability was present in versions prior to the 20070606 release, indicating that this was a known issue that required patching within a relatively short timeframe following its discovery.
The technical root cause of this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities in web applications. This weakness occurs when an application incorporates untrusted data into web pages without proper validation or encoding, allowing attackers to inject malicious scripts. The flaw manifests in the add_comment.php script where the id parameter is directly processed without adequate sanitization, creating an environment where attacker-controlled input can be interpreted as executable code by web browsers. This particular implementation allows remote attackers to inject arbitrary web script or HTML content, making it a persistent threat that can be exploited by unauthorized users without requiring authentication or elevated privileges. The vulnerability represents a failure in the application's defense-in-depth strategy, as it lacks proper input filtering and output encoding mechanisms that would normally prevent such injection attacks.
The operational impact of CVE-2007-3131 extends beyond simple script injection, as it creates a vector for more sophisticated attacks that can compromise user sessions, steal sensitive information, or redirect users to malicious websites. When users view comments containing malicious scripts, their browsers execute the injected code in the context of the vulnerable application, potentially leading to session hijacking, credential theft, or data exfiltration. The attack surface is particularly wide given that comment systems are typically accessible to all users, including unauthenticated visitors, making this vulnerability exploitable by anyone who can submit comments. This type of vulnerability also undermines user trust in the platform and can result in reputational damage, as users may be exposed to malicious content without their knowledge. The vulnerability's persistence in the application's codebase for an extended period before patching suggests potential issues with the security review processes and quality assurance practices within the development lifecycle.
Mitigation strategies for CVE-2007-3131 should focus on implementing robust input validation and output encoding practices as recommended by the OWASP Top Ten and the ATT&CK framework's defense strategies. The primary remediation involves sanitizing all user input parameters, particularly those used in dynamic content generation, through proper encoding techniques such as HTML entity encoding before rendering. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded. Organizations should also consider implementing proper input validation routines that reject or filter out potentially malicious content, including special characters and script tags. The patching process should include comprehensive regression testing to ensure that security fixes do not introduce new functionality issues. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components of the application, as this type of vulnerability often indicates broader security weaknesses in the application architecture. The vulnerability also highlights the importance of keeping web applications updated with the latest security patches, as the issue was resolved in the 20070606 release, demonstrating that timely patch management is crucial for maintaining application security.