CVE-2020-36918: iDS6 DSSPro Digital Signage CSRF Flaw

CVE-2020-36918 Overview

iDS6 DSSPro Digital Signage System 6.2 contains a cross-site request forgery (CSRF) vulnerability that allows attackers to perform administrative actions without proper request validation. This vulnerability enables malicious actors to craft specially designed web pages that trick authenticated administrators into executing unauthorized actions, such as adding new user accounts to the system.

The vulnerability stems from the application's failure to implement proper CSRF token validation on sensitive user management endpoints. When an administrator with an active session visits a malicious webpage, hidden requests can be automatically submitted to the DSSPro system, executing administrative commands without the user's knowledge or consent.

Critical Impact

Attackers can leverage this CSRF vulnerability to create unauthorized administrative accounts, potentially leading to complete system compromise of digital signage infrastructure.

Affected Products

• iDS6 DSSPro Digital Signage System 6.2

Discovery Timeline

• 2026-01-06 - CVE CVE-2020-36918 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2020-36918

Vulnerability Analysis

This Cross-Site Request Forgery (CSRF) vulnerability (CWE-352) exists in the user management functionality of iDS6 DSSPro Digital Signage System version 6.2. The application fails to validate that incoming state-changing requests originate from the application itself through mechanisms such as anti-CSRF tokens.

The attack leverages the network-based attack vector, requiring user interaction where an authenticated administrator must be tricked into visiting a malicious webpage. When successful, the attacker can force the victim's browser to submit forged requests that add unauthorized users to the system, modify existing user permissions, or perform other administrative functions.

The exploitation relies on the trust the application places in authenticated sessions without verifying request origin. Since browsers automatically include session cookies with cross-origin requests, an attacker-controlled webpage can submit form data or trigger AJAX requests to the vulnerable endpoints while the administrator's session is active.

Root Cause

The root cause of this vulnerability is the absence of CSRF protection mechanisms in the DSSPro Digital Signage System's user management interface. The application accepts and processes state-changing requests without validating the presence of anti-CSRF tokens or checking request origin headers. This design flaw allows any webpage to submit requests to the application's administrative endpoints as long as the victim has an active authenticated session.

Attack Vector

The attack follows a network-based vector requiring user interaction. An attacker constructs a malicious HTML page containing hidden forms or JavaScript that automatically submits requests to the vulnerable DSSPro endpoints. The attacker then distributes this malicious page via phishing emails, watering hole attacks, or other social engineering techniques.

When an administrator with an active DSSPro session loads the malicious page, their browser automatically submits the forged request along with their valid session cookies. The application processes the request as if it were legitimately initiated by the administrator, executing the malicious action such as creating a new administrative user account controlled by the attacker.

Technical details and proof-of-concept information can be found in the Zero Science Vulnerability Advisory ZSL-2020-5606 and the Exploit-DB entry #48990.

Detection Methods for CVE-2020-36918

Indicators of Compromise

• Unexpected user accounts appearing in the DSSPro user management interface
• Administrative actions logged without corresponding legitimate user activity
• Web server logs showing POST requests to user management endpoints from external referrer URLs
• Multiple user creation events occurring in rapid succession from the same administrator session

Detection Strategies

• Monitor web server access logs for requests to user management endpoints with suspicious or missing Referer headers
• Implement anomaly detection for administrative actions, particularly user account creation patterns
• Review authentication logs for session usage from unexpected geographic locations or IP addresses
• Deploy web application firewall (WAF) rules to detect potential CSRF attack patterns

Monitoring Recommendations

• Enable detailed logging of all administrative actions within the DSSPro system
• Configure alerts for new user account creation events requiring manual review
• Monitor for unusual patterns in administrator session activity
• Implement regular audits of user accounts and permission changes

How to Mitigate CVE-2020-36918

Immediate Actions Required

• Restrict network access to the DSSPro administrative interface to trusted IP ranges only
• Implement additional authentication factors for sensitive administrative operations
• Educate administrators about phishing risks and safe browsing practices while logged into the system
• Review existing user accounts for any unauthorized additions and remove suspicious entries

Patch Information

No vendor patch information is currently available for this vulnerability. Organizations should contact the vendor directly for security updates. Additional vulnerability details are available through the VulnCheck Advisory, IBM X-Force Vulnerability #191258, and Packet Storm Security File #159916.

Workarounds

• Deploy a reverse proxy or web application firewall that enforces CSRF token validation
• Restrict administrative access to the system through VPN-only connectivity
• Configure the system to require re-authentication for sensitive operations like user management
• Implement network segmentation to isolate digital signage systems from general browsing networks

# Example: Restrict administrative interface access via iptables
# Allow only trusted admin network (replace with your admin subnet)
iptables -A INPUT -p tcp --dport 80 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP