CVE-2018-12622 in Eventum
Summary
by MITRE
An issue was discovered in Eventum 3.5.0. htdocs/ajax/update.php has XSS via the field_name parameter.
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Analysis
by VulDB Data Team • 10/24/2023
The vulnerability identified as CVE-2018-12622 represents a cross-site scripting flaw within Eventum version 3.5.0, specifically affecting the ajax/update.php script. This issue arises from inadequate input validation and output sanitization mechanisms that fail to properly handle user-supplied data. The vulnerability is particularly concerning as it exists within a core administrative function that processes field updates through ajax requests, making it accessible to authenticated users who can manipulate form field names. The field_name parameter serves as the primary attack vector, where malicious input can be injected and subsequently executed within the browser context of unsuspecting users. This flaw demonstrates a classic lack of proper data sanitization practices that are fundamental to preventing XSS attacks.
The technical exploitation of this vulnerability follows established patterns for reflected XSS attacks where malicious JavaScript code is injected into the field_name parameter and then rendered in the application's response. When the vulnerable script processes this parameter without appropriate encoding or sanitization, the injected code becomes executable within the victim's browser session. The impact extends beyond simple script execution as it can potentially allow attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious domains. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws and represents a failure in input validation and output encoding controls. The attack surface is particularly significant given that the affected endpoint is part of the ajax functionality, meaning that the malicious payload can be delivered through asynchronous requests without requiring full page reloads.
The operational impact of CVE-2018-12622 extends beyond immediate code execution capabilities to encompass broader security implications for Eventum deployments. An attacker with access to the application can leverage this vulnerability to escalate privileges, access sensitive data, or manipulate the application's behavior through authenticated sessions. The vulnerability's presence in the update.php endpoint suggests that it could be used to modify critical application data or configuration parameters. Given that this affects version 3.5.0, it indicates a regression or oversight in the security hardening of the application's ajax handling components. The vulnerability also reflects poor adherence to security best practices such as those outlined in the OWASP Top Ten, particularly the category of injection flaws. Organizations using Eventum may face significant risks including data breaches, unauthorized access to issue tracking systems, and potential compromise of the entire application environment.
Mitigation strategies for this vulnerability should prioritize immediate patching of the Eventum application to version 3.5.1 or later, which contains the necessary fixes for the XSS vulnerability. In addition to patch management, implementing proper input validation and output encoding mechanisms is essential for preventing similar issues in the future. The fix should include sanitizing all user-supplied input parameters, particularly those used in dynamic content generation or ajax responses. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts, as well as monitoring for suspicious activities in the application logs. The vulnerability highlights the importance of regular security assessments and code reviews focusing on input handling and output encoding practices. Security teams should also implement automated scanning tools to identify similar vulnerabilities across their application portfolio and ensure that all ajax endpoints properly validate and sanitize user input. This incident underscores the critical need for comprehensive security testing throughout the software development lifecycle, particularly in components that handle dynamic data processing and user interactions.