CVE-2008-6476 in BlogEngine.NET
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in blog/search.aspx in BlogEngine.NET allows remote attackers to inject arbitrary web script or HTML via the q parameter.
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Analysis
by VulDB Data Team • 08/10/2024
The CVE-2008-6476 vulnerability represents a classic cross-site scripting flaw in BlogEngine.NET's search functionality, specifically within the blog/search.aspx page. This vulnerability arises from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it within the web application's response. The affected q parameter serves as the primary attack vector, allowing malicious actors to inject arbitrary HTML or JavaScript code that gets executed in the context of other users' browsers when they access the search results page.
This vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications. The technical implementation defect occurs when the application directly incorporates user input from the query parameter without proper sanitization or encoding before presenting it to end users. The flaw exists in the server-side processing logic where the search functionality fails to escape special characters or validate the input against a whitelist of acceptable characters. This creates an environment where attackers can execute malicious scripts in the victim's browser context, potentially leading to session hijacking, credential theft, or defacement of the blog content.
The operational impact of this vulnerability extends beyond simple data theft, as it enables attackers to manipulate the blog's user experience and potentially compromise the entire application ecosystem. When users browse search results containing malicious payloads, their browsers execute the injected scripts, which could redirect them to phishing sites, steal cookies and session tokens, or even install malware on their systems. The vulnerability is particularly dangerous in blog environments where users may trust the content and interact with search results without considering the security implications. Attackers can leverage this flaw to spread malicious content across multiple users who may not realize they are being targeted.
Mitigation strategies for CVE-2008-6476 should focus on implementing proper input validation and output encoding mechanisms. The most effective approach involves sanitizing all user input through parameterized queries or proper HTML encoding before rendering any content to users. Organizations should implement Content Security Policy headers to limit script execution and use frameworks that automatically escape output. The vulnerability also aligns with ATT&CK technique T1566 which covers social engineering through malicious content delivery, making it a critical target for defensive measures. Regular security audits and input validation testing should be implemented to prevent similar vulnerabilities in future versions of the application. Additionally, upgrading to patched versions of BlogEngine.NET and implementing web application firewalls can provide layered defense against exploitation attempts.