CVE-2016-20035: Wowza Streaming Engine CSRF Vulnerability

CVE-2016-20035 Overview

CVE-2016-20035 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Wowza Streaming Engine 4.5.0. This flaw allows attackers to perform administrative actions by crafting malicious web pages that target logged-in administrators. By tricking an authenticated administrator into visiting a malicious site, attackers can submit unauthorized POST requests to the user edit endpoint, potentially creating new admin accounts with arbitrary credentials.

Critical Impact

Attackers can gain unauthorized administrative access to the Wowza Streaming Engine management interface by exploiting this CSRF vulnerability to create rogue admin accounts.

Affected Products

• Wowza Streaming Engine 4.5.0

Discovery Timeline

• 2026-03-16 - CVE CVE-2016-20035 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2016-20035

Vulnerability Analysis

This Cross-Site Request Forgery (CWE-352) vulnerability exists in the user management functionality of Wowza Streaming Engine 4.5.0. The application fails to implement proper anti-CSRF tokens or other request validation mechanisms on the user edit endpoint. This allows an attacker to craft a malicious HTML page containing a hidden form that automatically submits a POST request to the Wowza management interface when an authenticated administrator visits the attacker-controlled page.

The attack requires no authentication from the attacker's perspective, as the victim's existing session credentials are leveraged to perform the unauthorized action. The vulnerability can be exploited remotely via the network, making it particularly concerning for organizations with publicly accessible management interfaces.

Root Cause

The root cause of this vulnerability is the absence of CSRF protection mechanisms on the user edit endpoint in Wowza Streaming Engine 4.5.0. The application does not validate that requests to modify user accounts originate from legitimate sources within the application itself. Without anti-CSRF tokens, referrer validation, or other state-changing request verification, the server cannot distinguish between legitimate administrative requests and malicious cross-origin requests initiated by an attacker.

Attack Vector

The attack vector for CVE-2016-20035 is network-based and requires user interaction. An attacker must craft a malicious web page containing a hidden form that targets the Wowza Streaming Engine user edit endpoint. When a logged-in administrator visits this malicious page—whether through phishing, a compromised website, or other social engineering techniques—the form automatically submits a POST request using the administrator's active session cookies. This allows the attacker to create new administrative accounts with credentials of their choosing, effectively granting them full control over the streaming server.

The exploitation mechanism involves embedding a hidden form with appropriate field values for creating a new user account, then using JavaScript to automatically submit the form when the victim loads the page. Technical details and proof-of-concept code can be found in the Zero Science Vulnerability Report and Exploit-DB #40134.

Detection Methods for CVE-2016-20035

Indicators of Compromise

• Unexpected or unauthorized administrator accounts appearing in the Wowza Streaming Engine user management console
• Suspicious user creation events in access logs corresponding to administrator sessions from unrecognized source IPs
• Administrator session activity occurring simultaneously from multiple geographic locations or IP addresses
• Unusual referrer headers in web server logs pointing to external domains during administrative actions

Detection Strategies

• Monitor Wowza Streaming Engine access logs for POST requests to user management endpoints that originate from suspicious referrer URLs
• Implement alerting for new user account creation events, particularly those with administrative privileges
• Deploy web application firewalls (WAF) configured to detect cross-site request forgery patterns and missing CSRF tokens
• Review audit logs regularly for unauthorized changes to user accounts or permissions

Monitoring Recommendations

• Enable comprehensive logging for all authentication and user management activities in Wowza Streaming Engine
• Implement session monitoring to detect anomalous administrator behavior patterns
• Configure SIEM solutions to correlate user creation events with administrator session data and source IP addresses
• Establish baseline metrics for administrative actions to identify deviations indicative of compromise

How to Mitigate CVE-2016-20035

Immediate Actions Required

• Restrict access to the Wowza Streaming Engine management interface to trusted IP addresses only using firewall rules or network segmentation
• Audit existing administrator accounts and remove any unrecognized or suspicious entries immediately
• Educate administrators about CSRF attack techniques and the risks of clicking unknown links while logged into the management console
• Consider implementing a web application firewall to provide additional protection against CSRF attacks

Patch Information

Organizations running Wowza Streaming Engine 4.5.0 should consult with Wowza directly or check for updated versions that address this CSRF vulnerability. For detailed information about the vulnerability and potential remediation, refer to the VulnCheck Security Advisory.

Workarounds

• Limit management interface access to localhost or internal networks only, requiring VPN access for remote administration
• Implement strong session management policies including shorter session timeouts for administrative users
• Use a dedicated browser profile exclusively for Wowza administration that is never used for general web browsing
• Deploy a reverse proxy with CSRF protection capabilities in front of the Wowza management interface

# Example: Restrict management interface access using iptables
# Allow management port access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 8088 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8088 -j DROP