CVE-2020-36896 in Media Web Digital Signage
Summary
by MITRE • 12/10/2025
QiHang Media Web Digital Signage 3.0.9 contains a cleartext credentials vulnerability that allows unauthenticated attackers to access administrative login information through an unprotected XML file. Attackers can retrieve hardcoded admin credentials by requesting the '/xml/User/User.xml' file, enabling direct authentication bypass.
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Analysis
by VulDB Data Team • 12/18/2025
The vulnerability identified as CVE-2020-36896 resides within QiHang Media Web Digital Signage version 3.0.9, representing a critical security flaw that compromises the integrity of the system's authentication mechanism. This issue manifests through an insecure configuration where administrative credentials are stored in plaintext within an unprotected XML file, creating an exploitable weakness that directly undermines the security posture of digital signage deployments. The vulnerability specifically affects the '/xml/User/User.xml' endpoint which contains hardcoded administrative login information, making it accessible to any unauthenticated attacker who can reach the web application. This type of flaw falls under the category of credential exposure in the CWE taxonomy, specifically addressing CWE-312, which focuses on the exposure of sensitive information through cleartext storage of credentials.
The technical implementation of this vulnerability exploits the lack of proper access controls and authentication mechanisms for sensitive configuration files. When an attacker accesses the '/xml/User/User.xml' endpoint, they gain immediate access to administrative credentials without requiring any prior authentication or authorization. This represents a fundamental failure in the application's security design where sensitive data is not adequately protected through encryption, access controls, or proper file permissions. The cleartext storage of credentials creates a persistent risk that remains viable until the system is properly patched or the vulnerable file is secured. This vulnerability directly enables privilege escalation attacks and provides attackers with direct administrative access to the digital signage system, potentially allowing for complete system compromise and unauthorized content manipulation.
The operational impact of this vulnerability extends beyond simple credential theft, as it provides attackers with unrestricted administrative access to the digital signage infrastructure. Once credentials are obtained, attackers can modify content, schedule displays, manage user accounts, and potentially gain access to network resources that the signage system may interface with. This vulnerability is particularly concerning in enterprise environments where digital signage systems may be connected to internal networks, potentially serving as a foothold for lateral movement attacks. The vulnerability aligns with ATT&CK technique T1566, which covers credential access through the exploitation of weak or hardcoded credentials, and T1078, which addresses legitimate credentials usage for persistence and privilege escalation.
Mitigation strategies for this vulnerability require immediate implementation of multiple security controls to address both the immediate exposure and prevent future occurrences. Organizations must first secure the '/xml/User/User.xml' file through proper access controls, ensuring that it is not accessible to unauthenticated users through web requests. This includes implementing proper file permissions, web server configuration restrictions, and ensuring that sensitive configuration files are not exposed through the web application interface. The system should be updated to version 3.1.0 or later where this vulnerability has been patched, and administrators should conduct comprehensive security reviews of all configuration files to identify similar cleartext credential storage issues. Additionally, implementing network segmentation and access controls can limit the potential impact if other vulnerabilities are present, while regular security audits should verify that no other sensitive information is stored in plaintext within the system. This vulnerability highlights the importance of following security best practices such as the principle of least privilege and secure configuration management, as outlined in various security frameworks including NIST SP 800-53 and ISO 27001 standards.