CVE-2012-2909 in Viscacha
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Viscacha 0.8.1.1 allow remote attackers to inject arbitrary web script or HTML via the (1) text field in the Private Messages System, (2) Bad Word field in Zensur, or (3) Portal or (4) Topic field in Kommentar.
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Analysis
by VulDB Data Team • 05/27/2025
The vulnerability CVE-2012-2909 represents a critical cross-site scripting flaw affecting Viscacha version 0.8.1.1, a popular bulletin board system. This vulnerability resides in the application's input validation mechanisms and allows remote attackers to execute malicious scripts within the context of other users' browsers. The flaw specifically impacts four distinct input fields within the application's core functionality, creating multiple attack vectors that could compromise user sessions and data integrity. The vulnerability's classification as CWE-79 indicates a failure in input sanitization, where user-supplied data is not properly validated or escaped before being rendered in web pages. This weakness directly enables attackers to inject malicious code that executes in the victim's browser context, potentially leading to session hijacking, credential theft, or data exfiltration.
The technical implementation of this vulnerability stems from insufficient sanitization of user inputs across multiple application modules. When users submit content through the Private Messages System's text field, the Zensur Bad Word field, or the Portal and Topic fields in the Kommentar module, the application fails to properly escape or validate the input before storing or displaying it. This creates opportunities for attackers to embed malicious javascript code or html elements that will execute when other users view the affected content. The attack requires no special privileges and can be executed through simple web requests, making it particularly dangerous as it can affect any user who views the malicious content. The vulnerability's persistence across multiple modules indicates a systemic issue in the application's security architecture rather than isolated code flaws.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with potential access to user sessions and sensitive data. When exploited, the XSS vulnerability could enable attackers to steal session cookies, redirect users to malicious sites, or modify content displayed to other users. The vulnerability affects the core communication and content management features of Viscacha, potentially compromising the entire user base that interacts through these modules. Attackers could leverage this vulnerability to impersonate users, access private messages, or manipulate forum content, leading to reputation damage and potential data breaches. The widespread nature of the vulnerability across multiple application functions increases the attack surface and makes comprehensive remediation challenging.
Mitigation strategies for CVE-2012-2909 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user inputs using proper escaping techniques before processing or storing data, with specific attention to the identified vulnerable fields. Implementing Content Security Policy headers can provide additional protection against script execution, while regular security audits should verify that all input fields are properly validated. The application should employ proper output encoding for all dynamic content, ensuring that any user-supplied data rendered in web pages cannot be interpreted as executable code. System administrators should also consider implementing web application firewalls to detect and block suspicious input patterns, while regular updates and patches should be applied to address similar vulnerabilities in the application's dependencies. This vulnerability aligns with ATT&CK technique T1566, which describes the use of malicious content to compromise systems through web-based attacks.