CVE-2020-5559 in WL-Enq
Summary
by MITRE
Cross-site scripting vulnerability in WL-Enq 1.11 and 1.12 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 05/11/2024
The CVE-2020-5559 vulnerability represents a critical cross-site scripting flaw affecting WL-Enq versions 1.11 and 1.12, demonstrating a fundamental weakness in web application input validation and output encoding mechanisms. This vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting attacks where malicious scripts can be injected into web applications. The flaw enables remote attackers to execute arbitrary web scripts or HTML code within the context of a victim's browser, potentially leading to session hijacking, data theft, or further exploitation of the affected system. The unspecified vectors suggest that the vulnerability may manifest through multiple entry points within the application's user input handling processes, making it particularly challenging to fully assess and mitigate.
The technical implementation of this vulnerability stems from inadequate sanitization of user-supplied data within the WL-Enq application framework. When users interact with the system through various input fields or parameters, the application fails to properly validate or encode the received data before rendering it in web pages. This allows attackers to craft malicious payloads that bypass security controls and execute within the victim's browser context. The vulnerability's remote nature means that attackers do not require physical access to the system or local network privileges to exploit it, significantly expanding the attack surface and potential impact. According to ATT&CK framework, this vulnerability maps to T1203 - Exploitation for Client Execution, where adversaries leverage web application flaws to execute malicious code in user browsers.
The operational impact of CVE-2020-5559 extends beyond simple script execution, potentially enabling sophisticated attack chains that could compromise entire user sessions and sensitive data. Attackers could leverage this vulnerability to steal session cookies, redirect users to malicious sites, or inject malicious content that appears legitimate to end users. The affected versions 1.11 and 1.12 suggest this is likely a long-standing issue within the application's codebase, potentially affecting organizations that have not updated to newer releases. Organizations using these vulnerable versions face significant risk of unauthorized access, data breaches, and potential regulatory compliance violations. The vulnerability's classification as remote and persistent means that once exploited, it could provide attackers with ongoing access to affected systems and users.
Mitigation strategies for CVE-2020-5559 should focus on immediate remediation through software updates to patched versions of WL-Enq, while also implementing additional defensive measures. Organizations should conduct comprehensive input validation and output encoding across all user-facing application components, ensuring that all user-supplied data is properly sanitized before processing or display. The implementation of Content Security Policy headers and proper HTTP response headers can provide additional layers of protection against XSS attacks. Security teams should also consider deploying web application firewalls and intrusion detection systems to monitor for exploitation attempts. According to industry best practices, organizations should maintain updated vulnerability management processes that include regular security assessments, penetration testing, and continuous monitoring for similar vulnerabilities in their web applications. The remediation process should include thorough testing of patched versions to ensure that the fix does not introduce regressions while maintaining full application functionality.