CVE-2018-12626 in Eventum
Summary
by MITRE
An issue was discovered in Eventum 3.5.0. /htdocs/popup.php has XSS via the cat parameter.
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Analysis
by VulDB Data Team • 10/24/2023
The vulnerability identified as CVE-2018-12626 represents a cross-site scripting flaw within Eventum version 3.5.0, specifically affecting the popup.php script. This issue arises from inadequate input validation and sanitization mechanisms that fail to properly handle user-supplied data. The vulnerability is accessible through the cat parameter, which when manipulated by an attacker can inject malicious scripts into the application's response. The affected component popup.php serves as a popup interface within the Eventum issue tracking system, making it a critical entry point for potential exploitation. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications. The security implications extend beyond simple script injection as this vulnerability can be leveraged to execute arbitrary code within the context of a victim's browser session.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing script code and passes it through the cat parameter in the popup.php endpoint. The application fails to sanitize or escape the input before rendering it in the browser context, allowing the malicious script to execute when the page loads. This flaw demonstrates poor security practices in input handling and output encoding, which are fundamental requirements for preventing XSS attacks according to industry standards. The vulnerability is particularly concerning because Eventum is typically used in environments where users may have varying privilege levels, potentially allowing attackers to escalate their access or perform unauthorized actions. The attack vector operates through standard web browser mechanisms, requiring no specialized tools beyond basic web request construction capabilities.
The operational impact of this vulnerability extends beyond immediate script execution to encompass potential session hijacking, credential theft, and privilege escalation within the Eventum application. An attacker could craft payloads that steal authentication cookies, redirect users to malicious sites, or inject additional malicious scripts that persist within the application environment. The vulnerability affects all users interacting with the popup.php functionality, potentially compromising the integrity of the entire issue tracking system. Organizations using Eventum may face significant security risks including unauthorized access to sensitive issue data, modification of existing records, and potential data exfiltration. This vulnerability aligns with ATT&CK technique T1059.007 which covers scripting through web shells, and represents a common attack pattern that exploits the trust relationship between web applications and their users.
Mitigation strategies for CVE-2018-12626 should prioritize immediate patching of the Eventum application to the latest secure version that addresses this vulnerability. Organizations should implement proper input validation and output encoding mechanisms across all user-supplied parameters, particularly those used in dynamic content generation. The implementation of Content Security Policy headers can provide additional defense-in-depth measures to prevent script execution even if input validation fails. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the Eventum system. Security teams should also consider implementing web application firewalls to monitor and block suspicious requests targeting the vulnerable popup.php endpoint. The fix should include proper HTML entity encoding of all user-supplied input before rendering in the browser context, ensuring that any potentially malicious scripts are neutralized through proper escaping mechanisms as recommended by OWASP guidelines for XSS prevention.