CVE-2009-3719 in Battle Blog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in comment.asp in Battle Blog 1.25 and 1.30 build 2 allows remote attackers to inject arbitrary web script or HTML via a comment.
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Analysis
by VulDB Data Team • 12/05/2024
The CVE-2009-3719 vulnerability represents a critical cross-site scripting flaw in Battle Blog version 1.25 and 1.30 build 2, specifically within the comment.asp component. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a fundamental web application security weakness that allows attackers to inject malicious client-side scripts into web pages viewed by other users. The vulnerability exists due to insufficient input validation and output encoding mechanisms within the comment processing functionality, creating an exploitable entry point for malicious actors to execute arbitrary web scripts or HTML code.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize user input submitted through the comment form. When users submit comments containing malicious script code, the web application does not adequately filter or encode these inputs before storing them in the database or rendering them on the web page. This lack of proper input sanitization creates a persistent XSS vector where the malicious content is executed in the context of other users' browsers who view the affected comments. The vulnerability specifically targets the comment.asp script which handles user-generated content processing, making it a prime target for attackers seeking to compromise user sessions or redirect them to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack vectors including session hijacking, credential theft, and redirection to phishing sites. Attackers can craft malicious comments that contain javascript payloads designed to steal cookies, redirect users to malicious domains, or perform actions on behalf of authenticated users. The vulnerability affects all users who interact with the blog's comment system, potentially compromising the security of the entire user base. This type of vulnerability can also facilitate the spread of malware through social engineering techniques, as users may unknowingly execute malicious code when viewing compromised comments. The persistent nature of stored XSS vulnerabilities means that once exploited, the malicious scripts remain active until manually removed from the application's database.
Organizations should implement comprehensive mitigations including input validation, output encoding, and the implementation of Content Security Policies to prevent such vulnerabilities from being exploited. The application should employ proper HTML escaping mechanisms for all user-generated content before rendering it on web pages. Additionally, implementing a Web Application Firewall can provide an additional layer of protection by detecting and blocking malicious script attempts. Security practitioners should also consider implementing the principle of least privilege and regular security audits to identify similar vulnerabilities in other components of the web application. This vulnerability aligns with ATT&CK technique T1566 which involves phishing attacks through malicious web content, emphasizing the importance of web application security in preventing such attack vectors from compromising user systems and data integrity.