CVE-2023-29441 in WebLibrarian Plugin
Summary
by MITRE • 09/06/2023
Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Robert Heller WebLibrarian plugin <= 3.5.8.1 versions.
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Analysis
by VulDB Data Team • 10/02/2023
The CVE-2023-29441 vulnerability represents a critical unauthenticated reflected cross-site scripting flaw discovered in the Robert Heller WebLibrarian plugin version 3.5.8.1 and earlier. This vulnerability exists within the plugin's handling of user input parameters that are reflected back to users without proper sanitization or encoding mechanisms. The flaw allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to unauthorized actions performed on behalf of victims. The vulnerability specifically affects the plugin's web interface where user-supplied data is processed and returned to the browser without adequate validation or output encoding.
The technical implementation of this XSS vulnerability stems from improper input validation within the WebLibrarian plugin's backend processing logic. When users interact with the plugin's web forms or URL parameters, the application fails to properly sanitize or encode user-provided input before rendering it back to the browser. This creates an environment where malicious payloads can be executed in the context of a victim's browser session, particularly when the application reflects the user input directly into HTML responses. The vulnerability is classified as reflected XSS because the malicious script is reflected off the web server in response to a user's request, rather than being stored on the server.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform a wide range of malicious activities including session hijacking, credential theft, and redirection to malicious sites. An attacker could craft a malicious URL containing XSS payloads that, when clicked by an authenticated user, would execute scripts in the victim's browser context. This could result in unauthorized access to library management features, data exfiltration, or modification of library records. The vulnerability affects all users of the plugin regardless of their authentication status, making it particularly dangerous in environments where the plugin is publicly accessible or where users may encounter malicious links in emails or other communication channels.
Mitigation strategies for CVE-2023-29441 should prioritize immediate plugin updates to versions 3.5.8.2 or later where the vulnerability has been patched. Organizations should also implement input validation and output encoding mechanisms at multiple layers including web application firewalls, content security policies, and application-level sanitization. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and it maps to ATT&CK technique T1566.001 for credential access through social engineering. Additional protective measures include implementing strict content security policies to prevent script execution, regular security scanning of web applications, and user education regarding suspicious links and unexpected script behavior. Network segmentation and monitoring for unusual traffic patterns may also help detect exploitation attempts. The vulnerability demonstrates the critical importance of input validation and output encoding in preventing XSS attacks, particularly in web applications that process user-supplied data and present it back to users.