CVE-2025-62786
📋 TL;DR
A heap-based out-of-bounds write vulnerability in Wazuh's decode_win_permissions function allows writing a NULL byte before an allocated buffer. Compromised agents or attackers sending crafted messages to the Wazuh manager can potentially achieve remote code execution. This affects Wazuh managers running vulnerable versions.
💻 Affected Systems
- Wazuh
📦 What is this software?
Wazuh by Wazuh
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on Wazuh manager, leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Denial of service through heap corruption or potential remote code execution if exploit conditions align with heap allocator specifics.
If Mitigated
Limited impact if network segmentation prevents agent compromise and message filtering blocks malicious payloads.
🎯 Exploit Status
Exploitation requires sending crafted messages to the manager, which typically requires agent compromise or network access. Heap allocator specifics affect reliability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.10.2
Vendor Advisory: https://github.com/wazuh/wazuh/security/advisories/GHSA-2c8r-p6r5-xxmr
Restart Required: Yes
Instructions:
1. Backup Wazuh configuration and data. 2. Stop Wazuh services. 3. Update to Wazuh 4.10.2 using package manager or source. 4. Restart Wazuh services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to Wazuh manager to trusted agents only using firewall rules.
iptables -A INPUT -p tcp --dport 1514 -s trusted_agent_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 1514 -j DROP
Agent Message Validation
allImplement additional validation for agent messages before processing by the manager.
🧯 If You Can't Patch
- Isolate Wazuh manager on segmented network with strict access controls
- Monitor for unusual agent messages or heap corruption indicators in logs
🔍 How to Verify
Check if Vulnerable:
Check Wazuh version: if below 4.10.2, system is vulnerable.Check Version:
wazuh-manager -VVerify Fix Applied:
Confirm version is 4.10.2 or higher and monitor for crash reports in /var/ossec/logs/ossec.log.📡 Detection & Monitoring
Log Indicators:
- Heap corruption errors in ossec.log
- Unexpected agent message patterns
- Wazuh manager crashes or restarts
Network Indicators:
- Unusual agent-to-manager traffic patterns
- Crafted messages to port 1514
SIEM Query:
source="ossec.log" AND ("heap" OR "corruption" OR "decode_win_permissions")