CVE-2025-65791: Zoneminder RCE Vulnerability

CVE-2025-65791 Overview

A critical command injection vulnerability has been identified in ZoneMinder v1.36.34, a popular open-source video surveillance solution. The vulnerability exists in the web/views/image.php component, where unsanitized user input is passed directly to the exec() function, allowing remote attackers to execute arbitrary operating system commands on the underlying server.

Critical Impact

This command injection vulnerability allows unauthenticated remote attackers to execute arbitrary system commands with the privileges of the web server process, potentially leading to complete system compromise.

Affected Products

• ZoneMinder version 1.36.34

Discovery Timeline

• 2026-02-18 - CVE-2025-65791 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2025-65791

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The vulnerable component resides in web/views/image.php, which is responsible for handling image-related requests within the ZoneMinder web interface.

The fundamental flaw lies in the application's failure to properly validate and sanitize user-controlled input before incorporating it into system command execution via PHP's exec() function. This allows an attacker to inject shell metacharacters and arbitrary commands that will be executed by the underlying operating system.

Since ZoneMinder typically runs on Linux-based systems with the web server user permissions (often www-data or similar), successful exploitation grants attackers the ability to execute commands with those privileges. This can lead to data exfiltration, installation of backdoors, lateral movement within the network, or complete system takeover if privilege escalation vulnerabilities are chained.

Root Cause

The root cause of this vulnerability is insufficient input validation in the image.php file. User-supplied parameters are concatenated directly into command strings that are subsequently executed via the exec() function without proper sanitization or escaping of shell metacharacters. This violates secure coding principles that mandate treating all user input as untrusted and applying appropriate validation, sanitization, and parameterization before use in sensitive operations.

Attack Vector

The attack vector is network-based, requiring no authentication and no user interaction. An attacker can craft malicious HTTP requests to the vulnerable image.php endpoint, injecting shell commands through manipulated parameters. The injected commands are then executed by the server when the exec() function processes the unsanitized input.

Common injection techniques include using shell metacharacters such as semicolons (;), pipes (|), backticks, or command substitution syntax ($(command)) to append or chain malicious commands to legitimate operations. For detailed technical information and proof-of-concept examples, refer to the GitHub PoC Repository.

Detection Methods for CVE-2025-65791

Indicators of Compromise

• Unusual process spawning from the web server process (Apache/Nginx)
• Unexpected outbound network connections from the ZoneMinder server
• Suspicious entries in web server access logs containing shell metacharacters in requests to image.php
• Creation of unauthorized files or modifications to system configurations
• Unexpected user accounts or SSH keys added to the system

Detection Strategies

• Monitor web server logs for requests to /web/views/image.php containing suspicious characters such as ;, |, &, $(), or backticks
• Implement Web Application Firewall (WAF) rules to detect and block command injection patterns targeting ZoneMinder endpoints
• Deploy endpoint detection solutions capable of identifying anomalous process execution chains originating from web server processes
• Enable PHP logging and audit exec(), shell_exec(), system(), and similar function calls

Monitoring Recommendations

• Configure SIEM alerts for command injection signature patterns in HTTP request parameters
• Monitor for unusual child processes spawned by the web server process
• Track file system changes in ZoneMinder installation directories and system-critical paths
• Establish baseline network behavior and alert on anomalous outbound connections from the surveillance server

How to Mitigate CVE-2025-65791

Immediate Actions Required

• Restrict network access to ZoneMinder web interface to trusted IP addresses only
• Implement a Web Application Firewall with command injection protection rules
• Review and audit access logs for potential exploitation attempts
• Consider temporarily disabling the ZoneMinder web interface if not critical to operations
• Isolate the ZoneMinder server from sensitive network segments

Patch Information

At the time of this publication, no official vendor patch information is available in the CVE data. Organizations should monitor the official ZoneMinder project channels and security advisories for patch releases. Additional technical details are available in the GitHub PoC Repository.

Workarounds

• Implement strict network segmentation to limit access to the ZoneMinder server
• Deploy a reverse proxy with input validation rules to filter malicious requests before they reach the application
• Apply PHP configuration hardening by disabling dangerous functions like exec(), shell_exec(), and system() if not required
• Run ZoneMinder with minimal privileges and consider containerization to limit the blast radius of potential compromise

# Example: Restrict dangerous PHP functions in php.ini (if exec() is not required)
disable_functions = exec,shell_exec,system,passthru,popen,proc_open

# Example: Apache configuration to restrict access to image.php
<Location "/web/views/image.php">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Location>