CVE-2012-2331 in serendipity
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in serendipity/serendipity_admin_image_selector.php in Serendipity before 1.6.1 allows remote attackers to inject arbitrary web script or HTML via the serendipity[textarea] parameter. NOTE: this issue might be resultant from cross-site request forgery (CSRF).
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Analysis
by VulDB Data Team • 04/08/2025
The CVE-2012-2331 vulnerability represents a critical cross-site scripting flaw discovered in the Serendipity blogging platform's administrative image selector component. This vulnerability exists in versions prior to 1.6.1 and specifically targets the serendipity_admin_image_selector.php file, making it a significant concern for web application security. The flaw allows remote attackers to execute malicious scripts within the context of other users' browsers, potentially leading to unauthorized actions and data theft. The vulnerability manifests through the serendipity[textarea] parameter, which serves as an injection point for malicious payloads that can be executed when the affected page is rendered.
The technical implementation of this XSS vulnerability stems from insufficient input validation and output sanitization within the administrative interface. When user-supplied data is directly incorporated into dynamic web page content without proper encoding or escaping, it creates an opening for attackers to inject malicious scripts. The serendipity[textarea] parameter likely receives user input that should be treated as untrusted data, but the application fails to properly sanitize this input before rendering it in the HTML context. This vulnerability falls under CWE-79 which specifically addresses Cross-site Scripting flaws in software applications, where the weakness allows attackers to inject malicious code into web pages viewed by other users. The flaw demonstrates poor security practices in input handling and output encoding that are fundamental to preventing XSS attacks.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling attackers to perform a wide range of malicious activities within the compromised system. An attacker could leverage this vulnerability to steal session cookies, perform unauthorized administrative actions, modify content, or redirect users to malicious websites. The fact that this vulnerability occurs in the administrative image selector component amplifies its danger, as it provides access to privileged functions within the blogging platform. When combined with the noted potential for cross-site request forgery, the attack surface expands significantly, allowing for more sophisticated exploitation techniques that could bypass certain security mechanisms. This vulnerability directly aligns with ATT&CK technique T1531 which involves using credentials obtained through various means to gain unauthorized access to systems.
The security implications of CVE-2012-2331 highlight the importance of implementing comprehensive input validation and output encoding mechanisms throughout web applications. Organizations using Serendipity versions prior to 1.6.1 should immediately implement the available security patches to address this vulnerability. The remediation process involves proper sanitization of user inputs, particularly those destined for dynamic HTML contexts, and implementing Content Security Policy headers to mitigate the impact of potential XSS attacks. Additionally, developers should adopt secure coding practices that prevent the direct inclusion of user-supplied data in web page output without appropriate encoding. The vulnerability serves as a reminder that even administrative components of web applications require rigorous security testing and validation, as these interfaces often provide the most privileged access paths within a system. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of the application stack.