CVE-2024-22116: Zabbix RCE Vulnerability

CVE-2024-22116 Overview

CVE-2024-22116 is a code injection vulnerability affecting Zabbix, the popular open-source monitoring solution. An administrator with restricted permissions can exploit the script execution functionality within the Monitoring Hosts section. The lack of default escaping for script parameters enables this user to execute arbitrary code via the Ping script, thereby compromising infrastructure.

Critical Impact

Administrators with limited privileges can escalate their access by injecting malicious commands through unescaped script parameters, potentially leading to full infrastructure compromise.

Affected Products

• Zabbix versions prior to patched releases
• Zabbix 7.0.0 alpha1 through alpha9
• Zabbix 7.0.0 beta1 through beta3, rc1, and rc2

Discovery Timeline

• 2024-08-12 - CVE-2024-22116 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2024-22116

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code / Code Injection). The flaw exists in how Zabbix handles script parameters within the Monitoring Hosts section. When an administrator executes built-in scripts like the Ping utility, user-supplied parameters are not properly sanitized or escaped before being passed to the underlying system shell.

This architectural oversight allows an attacker with restricted administrative privileges to inject arbitrary shell commands alongside legitimate script parameters. The vulnerability is particularly concerning because it enables privilege escalation—a user who should only have monitoring capabilities can leverage this flaw to execute code with the privileges of the Zabbix server process.

Root Cause

The root cause of CVE-2024-22116 is the absence of default escaping mechanisms for script parameters in the Zabbix Monitoring Hosts functionality. When scripts are executed, user-controlled input is concatenated directly into shell commands without proper sanitization. This creates a classic command injection scenario where metacharacters and shell operators can break out of the intended parameter context and execute attacker-controlled commands.

Attack Vector

The vulnerability is exploitable over the network by authenticated administrators with restricted permissions. The attack requires:

1. Valid credentials for a restricted administrator account with access to the Monitoring Hosts section
2. Permissions to execute scripts (specifically the Ping script functionality)
3. Knowledge of shell injection techniques to craft malicious parameters

An attacker would navigate to the Monitoring Hosts section and execute the Ping script against a target host. Instead of providing a legitimate hostname or IP address, the attacker injects shell metacharacters followed by arbitrary commands. These commands execute with the privileges of the Zabbix server process, potentially allowing data exfiltration, lateral movement, or further compromise of the monitoring infrastructure.

The vulnerability allows injection through the Ping script's parameter field. When a malicious parameter containing shell metacharacters (such as ;, |, &&, or backticks) is provided, the unescaped input results in arbitrary command execution on the Zabbix server. For detailed technical information, refer to the Zabbix Issue Tracker Entry.

Detection Methods for CVE-2024-22116

Indicators of Compromise

• Unusual script execution patterns in Zabbix audit logs, particularly Ping scripts with abnormal parameter values
• Unexpected processes spawned by the Zabbix server process
• Shell metacharacters (;, |, &&, `, $()) appearing in script execution logs
• Network connections initiated from the Zabbix server to unexpected destinations

Detection Strategies

• Monitor Zabbix audit logs for script executions containing shell metacharacters or suspicious parameter patterns
• Implement anomaly detection for command-line arguments passed to Zabbix script functions
• Deploy endpoint detection and response (EDR) solutions to identify unexpected child processes from the Zabbix server
• Review access logs for restricted administrators accessing the Monitoring Hosts section with unusual frequency

Monitoring Recommendations

• Enable comprehensive audit logging in Zabbix and forward logs to a SIEM for analysis
• Create alerts for script execution events that contain potentially malicious characters or patterns
• Monitor the Zabbix server's process tree for unexpected command execution
• Implement network monitoring to detect anomalous outbound connections from the Zabbix server

How to Mitigate CVE-2024-22116

Immediate Actions Required

• Apply the latest security patches from Zabbix that address CVE-2024-22116
• Review and restrict administrator permissions, limiting script execution access to only essential personnel
• Audit recent script execution logs for signs of exploitation
• Temporarily disable script execution functionality if patching is not immediately possible

Patch Information

Zabbix has addressed this vulnerability in patched releases. Administrators should upgrade to the latest stable version of Zabbix that includes the fix. For detailed patch information and affected version specifics, consult the Zabbix Issue Tracker Entry. Debian users should also review the Debian LTS Announcement for distribution-specific guidance.

Workarounds

• Restrict access to the Monitoring Hosts section to only fully trusted administrators
• Disable or remove unnecessary built-in scripts, including the Ping script, until patches can be applied
• Implement additional input validation at the network level using a web application firewall (WAF)
• Consider running the Zabbix server in a containerized or sandboxed environment to limit the impact of potential exploitation

# Review and restrict user roles with script execution permissions
# In Zabbix Administration > User roles, audit permissions for:
# - Access to Monitoring section
# - Execute scripts capability
# Disable script execution for restricted admin accounts until patched