CVE-2018-14517 in SeaCMS
Summary
by MITRE
SeaCMS 6.61 has two XSS issues in the admin_config.php file via certain form fields.
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Analysis
by VulDB Data Team • 03/09/2020
The vulnerability CVE-2018-14517 affects SeaCMS version 6.61 and represents a cross-site scripting vulnerability within the administrative configuration interface. This issue manifests in the admin_config.php file where specific form fields fail to properly sanitize user input, creating opportunities for malicious actors to inject arbitrary JavaScript code. The vulnerability stems from inadequate input validation and output encoding mechanisms that allow attacker-controlled data to be executed within the browser context of authenticated administrators. Such flaws typically arise when web applications fail to properly escape or filter data before rendering it in HTML responses, particularly in administrative panels where users have elevated privileges. The presence of XSS vulnerabilities in administrative interfaces poses significant risks as they can be exploited to hijack administrator sessions, modify system configurations, or gain unauthorized access to sensitive data.
The technical implementation of this vulnerability involves the exploitation of form fields within the admin_config.php file where user-supplied parameters are directly incorporated into web page output without proper sanitization. When administrators interact with these forms, malicious payloads can be stored and subsequently executed in their browser sessions, creating a persistent threat vector. The vulnerability classifies under CWE-79 which specifically addresses Cross-Site Scripting flaws, and aligns with ATT&CK technique T1059.007 for Scripting, as it enables adversaries to execute malicious scripts within the victim context. The attack typically requires an authenticated administrator to submit malicious input through the vulnerable form fields, making the exploitation dependent on the attacker's ability to obtain valid administrative credentials or compromise an existing administrative session. The impact is amplified when considering that administrative interfaces often contain sensitive configuration options that can be manipulated to compromise entire systems.
The operational consequences of this vulnerability extend beyond simple script execution, as it can enable attackers to perform a range of malicious activities within the compromised administrative environment. An attacker could potentially modify system settings, create backdoor accounts, extract sensitive configuration data, or manipulate content management features to redirect traffic or serve malicious content. The vulnerability's persistence is particularly concerning as stored XSS payloads remain active until manually removed from the affected form fields, allowing for extended periods of unauthorized access. Security professionals should note that this vulnerability demonstrates the critical importance of input validation in administrative interfaces, where the consequences of insufficient sanitization can be catastrophic given the elevated privileges of administrative users. Organizations with SeaCMS installations should prioritize immediate patching to address this vulnerability, as it represents a significant exposure in the web application's security posture.
The remediation approach for CVE-2018-14517 requires implementing comprehensive input validation and output encoding mechanisms throughout the affected admin_config.php file. Security measures should include sanitizing all user inputs through proper escaping functions before rendering them in HTML contexts, implementing Content Security Policy headers to limit script execution, and conducting thorough code reviews to identify similar vulnerabilities in other administrative components. Additionally, organizations should consider implementing web application firewalls to detect and block suspicious input patterns, while establishing regular security testing procedures to identify potential XSS vulnerabilities before they can be exploited. The vulnerability serves as a reminder of the critical need for maintaining up-to-date software versions and implementing robust security controls in content management systems, particularly those with administrative interfaces that handle sensitive data and configuration options.