CVE-2025-62785
📋 TL;DR
A NULL pointer dereference vulnerability in Wazuh's fillData() function allows compromised agents to crash the analysisd service by sending specially crafted messages. This causes denial of service to the Wazuh manager's analysis capabilities. Organizations running Wazuh managers with untrusted or potentially compromised agents are affected.
💻 Affected Systems
- Wazuh
📦 What is this software?
Wazuh by Wazuh
⚠️ Risk & Real-World Impact
Worst Case
Sustained attacks could cause repeated analysisd crashes, effectively disabling threat detection and response capabilities across the monitored environment.
Likely Case
Intermittent analysisd crashes leading to gaps in log analysis and alerting, potentially allowing threats to go undetected during downtime.
If Mitigated
With proper network segmentation and agent trust controls, impact is limited to isolated incidents with quick service recovery.
🎯 Exploit Status
Exploitation requires agent compromise first, but the crash attack itself is simple once an agent is controlled.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.10.2
Vendor Advisory: https://github.com/wazuh/wazuh/security/advisories/GHSA-mqpq-pcxc-8259
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Update Wazuh manager to version 4.10.2 using package manager. 3. Restart Wazuh services: systemctl restart wazuh-manager. 4. Verify services are running: systemctl status wazuh-manager.
🔧 Temporary Workarounds
Network segmentation
allRestrict agent communication to only trusted networks and implement strict firewall rules between agents and manager.
Agent integrity monitoring
allImplement additional monitoring for agent compromise indicators to detect potentially malicious agents before they can exploit this vulnerability.
🧯 If You Can't Patch
- Implement strict network access controls to limit which agents can communicate with the manager
- Monitor analysisd process health and implement automatic restart scripts for crash recovery
🔍 How to Verify
Check if Vulnerable:
Check Wazuh version: cat /etc/ossec-init.conf | grep VERSION. If version is below 4.10.2, system is vulnerable.Check Version:
cat /etc/ossec-init.conf | grep VERSIONVerify Fix Applied:
After update, verify version is 4.10.2 or higher and check analysisd process is stable: ps aux | grep analysisd📡 Detection & Monitoring
Log Indicators:
- analysisd crash logs in /var/ossec/logs/ossec.log
- Repeated analysisd service restarts in system logs
Network Indicators:
- Unusual agent-to-manager message patterns or frequency
SIEM Query:
source="ossec.log" AND "analysisd" AND ("crash" OR "segmentation fault" OR "abnormal termination")