CVE-2025-27234
📋 TL;DR
The Zabbix Agent 2 smartctl plugin fails to properly sanitize smart.disk.get parameters, allowing attackers to inject malicious arguments into smartctl commands. In Zabbix 5.0, this vulnerability enables remote code execution. Systems running vulnerable versions of Zabbix Agent 2 with the smartctl plugin enabled are affected.
💻 Affected Systems
- Zabbix Agent 2
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via remote code execution, allowing attacker to execute arbitrary commands with the privileges of the Zabbix Agent process.
Likely Case
Remote code execution leading to data exfiltration, lateral movement, or installation of persistent backdoors.
If Mitigated
Limited impact if smartctl plugin is disabled or proper network segmentation prevents access to Zabbix Agent.
🎯 Exploit Status
The vulnerability involves command injection through parameter manipulation, which typically requires minimal technical skill to exploit once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Zabbix security advisory for specific patched version
Vendor Advisory: https://support.zabbix.com/browse/ZBX-26985
Restart Required: Yes
Instructions:
1. Check current Zabbix Agent 2 version. 2. Apply vendor patch/update to latest secure version. 3. Restart Zabbix Agent 2 service. 4. Verify plugin functionality.
🔧 Temporary Workarounds
Disable smartctl plugin
linuxTemporarily disable the vulnerable smartctl plugin to prevent exploitation
Edit Zabbix Agent 2 configuration file and comment out or remove smartctl plugin configuration
Restart Zabbix Agent 2 service
Network segmentation
allRestrict network access to Zabbix Agent ports
Configure firewall rules to limit Zabbix Agent access to trusted monitoring servers only
🧯 If You Can't Patch
- Disable smartctl plugin immediately in all agent configurations
- Implement strict network controls to limit Zabbix Agent access to monitoring infrastructure only
🔍 How to Verify
Check if Vulnerable:
Check Zabbix Agent 2 version and configuration for smartctl plugin usageCheck Version:
zabbix_agent2 --versionVerify Fix Applied:
Verify Zabbix Agent 2 is updated to patched version and smartctl plugin functions without security issues📡 Detection & Monitoring
Log Indicators:
- Unusual smartctl command arguments in Zabbix Agent logs
- Unexpected process execution from Zabbix Agent user
Network Indicators:
- Unusual network connections originating from Zabbix Agent hosts
- Traffic to Zabbix Agent ports from unauthorized sources
SIEM Query:
source="zabbix_agent.log" AND "smart.disk.get" AND (command_injection_indicators OR unusual_arguments)