CVE-2009-0335 in BlogIt!
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.asp in Katy Whitton BlogIt! allows remote attackers to inject arbitrary web script or HTML via the view parameter.
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Analysis
by VulDB Data Team • 11/22/2024
The vulnerability identified as CVE-2009-0335 represents a classic cross-site scripting flaw within the Katy Whitton BlogIt! blogging platform, specifically affecting the index.asp component. This issue manifests when the application fails to properly sanitize user input passed through the view parameter, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability resides in the application's handling of dynamic content generation where user-supplied parameters directly influence the output rendered to end users without adequate validation or encoding mechanisms.
From a technical perspective, the flaw operates as a reflected cross-site scripting vulnerability where attacker-controlled data flows through the application's input processing and immediately back into the user interface without proper sanitization. The view parameter serves as the primary attack vector, allowing an attacker to craft malicious payloads that get executed when victims navigate to affected pages. This type of vulnerability typically falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly escape or encode user-supplied data before incorporating it into dynamically generated web content. The vulnerability is particularly dangerous because it enables attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious sites.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can serve as a foundation for more sophisticated attacks within the target environment. An attacker could leverage this vulnerability to establish persistent access through session hijacking, harvest sensitive information from authenticated users, or deploy malware through browser-based exploits. The reflected nature of the vulnerability means that the attack payload is delivered through a specially crafted URL that, when visited by a victim, executes the malicious script in their browser context. This characteristic aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, where the initial compromise occurs through malicious web content delivered via web-based attack vectors rather than traditional email attachments.
Mitigation strategies for CVE-2009-0335 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The most effective immediate fix involves sanitizing all user-supplied input through proper encoding before incorporating it into dynamic web content, particularly when dealing with parameters like the view parameter in this case. Implementing Content Security Policy headers can provide additional defense-in-depth by restricting the sources from which scripts can be loaded and executed. Additionally, developers should adopt secure coding practices including the use of parameterized queries for dynamic content generation, input validation libraries, and regular security code reviews. Organizations should also consider implementing web application firewalls to detect and block malicious payloads attempting to exploit this type of vulnerability, while maintaining up-to-date patch management procedures to ensure all known vulnerabilities are addressed promptly. The vulnerability demonstrates the critical importance of input validation and output encoding as fundamental security controls that should be implemented consistently across all web applications to prevent similar issues from occurring in the future.