CVE-2018-18733 in Catfish
Summary
by MITRE
An XSS issue was discovered in Catfish CMS 4.8.30, related to "write source code," a similar issue to CVE-2018-13999.
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Analysis
by VulDB Data Team • 04/07/2020
The vulnerability identified as CVE-2018-18733 represents a cross-site scripting flaw within Catfish CMS version 4.8.30 that specifically impacts the "write source code" functionality. This issue demonstrates a critical weakness in the content management system's input validation and output encoding mechanisms, creating an avenue for malicious actors to inject arbitrary JavaScript code into the application's interface. The vulnerability is particularly concerning as it operates within a core administrative function that allows users to edit and manage source code content, making it a prime target for exploitation in privilege escalation attacks. The flaw enables attackers to manipulate the CMS's code editing interface in ways that can persist across user sessions and potentially compromise the entire application environment.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a reflected XSS variant that occurs when user-supplied data is improperly sanitized before being rendered in the web application's response. The technical implementation of this flaw suggests that Catfish CMS fails to properly escape or filter special characters within the source code editor, allowing attackers to inject malicious payloads that execute in the context of other users' browsers. The similarity to CVE-2018-13999 indicates a systemic issue within the CMS's code handling mechanisms, where source code input is not adequately protected against injection attacks. This pattern of vulnerability points to inadequate security controls in the application's data sanitization pipeline, particularly concerning the handling of user-generated content within administrative interfaces.
The operational impact of CVE-2018-18733 extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal administrative credentials, and potentially gain full control over the CMS installation. When exploited, this vulnerability allows adversaries to execute malicious scripts in the context of authenticated users, potentially leading to privilege escalation attacks that can result in complete system compromise. The attack surface is particularly broad since the vulnerability affects the core source code editing functionality, which is typically accessed by administrators and trusted users who have elevated privileges. This creates a significant risk for organizations relying on Catfish CMS, as successful exploitation could lead to data breaches, unauthorized content modification, and the potential for lateral movement within network environments where the CMS is deployed.
Organizations should implement immediate mitigations including input validation and output encoding controls that sanitize all user-supplied data before it is processed or displayed within the CMS interface. The recommended approach involves implementing strict content security policies that prevent script execution in the context of the application, along with comprehensive input filtering that removes or escapes potentially dangerous characters. Additionally, the application should enforce proper access controls and implement multi-factor authentication for administrative accounts to limit the potential impact of successful exploitation. Security patches should be applied immediately upon availability, as the vulnerability affects a core functionality that is critical to the CMS's operation. The implementation of web application firewalls and regular security scanning should also be considered as part of a comprehensive defense-in-depth strategy, with particular attention to monitoring for unusual administrative activities that might indicate exploitation attempts. This vulnerability demonstrates the critical importance of maintaining up-to-date security controls and proper input validation mechanisms within content management systems, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications and T1078 for legitimate account exploitation.