CVE-2011-3383 in Webforum
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in KENT-WEB WEB FORUM 5.1 and earlier allows remote attackers to inject arbitrary web script or HTML via vectors related to "the web page to be output."
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Analysis
by VulDB Data Team • 02/12/2019
The CVE-2011-3383 vulnerability represents a classic cross-site scripting flaw affecting KENT-WEB WEB FORUM versions 5.1 and earlier. This vulnerability resides in the web application's handling of user-provided input during page generation processes, creating a persistent security risk that can be exploited by remote attackers without requiring authentication or specialized privileges. The vulnerability specifically manifests when the application fails to properly sanitize or escape user-controllable data that gets rendered in web page outputs, allowing malicious scripts to be executed within the context of other users' browsers. This type of weakness falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application vulnerabilities identified in the CWE top 25 list. The vulnerability enables attackers to inject arbitrary web scripts or HTML content through input fields or parameters that influence the final web page output, making it particularly dangerous for forum applications where user-generated content is common and trusted.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input that gets processed by the forum application and subsequently rendered in web pages viewed by other users. The flaw exists in the application's output encoding and validation mechanisms, where user-supplied data intended for display is not properly escaped or filtered before being inserted into HTML contexts. When legitimate users browse pages containing the maliciously injected content, their browsers execute the embedded scripts within their browser sessions, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability's impact is amplified in forum environments where multiple users interact and trust the content displayed, as the injected scripts can execute in the context of authenticated sessions, potentially compromising user accounts and sensitive information. This weakness directly violates the principle of input validation and output encoding that is fundamental to secure web application development practices.
The operational impact of CVE-2011-3383 extends beyond simple script execution to encompass significant security risks for forum administrators and users alike. Attackers can leverage this vulnerability to perform session theft by injecting scripts that steal authentication cookies or session tokens, effectively allowing unauthorized access to user accounts. The vulnerability also enables phishing attacks where malicious scripts redirect users to fraudulent sites or harvest login credentials through credential-stealing scripts. Additionally, the vulnerability can be used to deface forum pages, inject malicious advertisements, or create backdoor access points within the compromised environment. The persistent nature of this vulnerability means that once exploited, the malicious content remains active until manually removed from the application's data stores, potentially affecting all users who access the compromised forum pages. This makes the vulnerability particularly dangerous for collaborative platforms where content is frequently shared and viewed by multiple users over extended periods.
Mitigation strategies for CVE-2011-3383 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The primary defense involves proper escaping of user-controllable data before rendering it in web contexts, utilizing context-specific encoding techniques such as HTML entity encoding for HTML content, JavaScript encoding for script contexts, and URL encoding for URL parameters. Organizations should implement comprehensive input sanitization that filters or rejects potentially malicious content before it is processed or stored in the application's database. The implementation of Content Security Policy (CSP) headers can provide additional protection by restricting the sources from which scripts can be loaded and executed within the browser context. Regular security auditing and code reviews should be conducted to identify similar vulnerabilities in other parts of the application, while also ensuring that the forum software is updated to versions that address this specific vulnerability. The vulnerability's remediation aligns with ATT&CK technique T1566 which covers social engineering tactics, as the attack vector involves manipulating user interactions through malicious content injection that can be classified as a form of phishing or social engineering attack. Organizations should also implement proper security training for developers to prevent similar issues in future development cycles and establish secure coding practices that align with OWASP Top Ten security guidelines.