CVE-2020-20645 in EyouCMS
Summary
by MITRE • 08/20/2021
Cross Site Scripting (XSS) vulnerability exists in EyouCMS1.3.6 in the basic_information area.
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Analysis
by VulDB Data Team • 08/25/2021
The Cross Site Scripting vulnerability identified as CVE-2020-20645 affects EyouCMS version 1.3.6 within its basic_information functionality area. This vulnerability represents a critical security flaw that allows attackers to inject malicious scripts into web applications, potentially compromising user sessions and data integrity. The vulnerability specifically manifests in the basic_information section of the content management system, making it a prime target for exploitation by threat actors seeking to leverage user trust and system access. The presence of this XSS flaw in a core administrative area significantly amplifies the potential impact of the vulnerability.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the EyouCMS basic_information module. When users interact with the administrative interface to manage basic information parameters, the application fails to properly sanitize user-supplied data before rendering it back to the browser. This insufficient sanitization creates an opening for malicious actors to inject crafted script payloads that execute within the context of other users' browsers. The vulnerability follows the common XSS pattern where untrusted data flows directly from user input to output without proper context-aware encoding, making it susceptible to script injection attacks. According to CWE standards, this represents a classic CWE-79: Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness that has been documented extensively in the security community.
The operational impact of CVE-2020-20645 extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive user credentials, manipulate data within the CMS, and potentially escalate privileges within the system. An attacker could exploit this vulnerability to inject malicious scripts that capture user login information, redirect users to malicious sites, or modify content displayed to other administrators. The basic_information area typically contains critical system configuration data, making successful exploitation particularly dangerous as it could allow unauthorized modification of core system parameters. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, demonstrating how attackers can leverage web-based scripting to compromise system integrity and user trust.
Mitigation strategies for this vulnerability should include immediate implementation of proper input validation and output encoding mechanisms throughout the basic_information module. Organizations should ensure that all user-supplied data is properly sanitized using context-appropriate encoding methods before being rendered in web pages. The recommended approach involves implementing Content Security Policy (CSP) headers to limit script execution sources and employing proper HTML encoding for all dynamic content. Additionally, the CMS should be updated to a patched version that addresses the specific XSS vulnerability in the basic_information area, as the vendor has likely released security patches to resolve this flaw. Regular security assessments and input validation reviews should be conducted to prevent similar vulnerabilities from emerging in other parts of the application, aligning with industry best practices outlined in OWASP Top Ten and NIST cybersecurity guidelines for web application security.