CVE-2025-32915
📋 TL;DR
This vulnerability allows local attackers on Linux and Solaris systems to read sensitive data from Checkmk agent update packages due to incorrect file permissions. It affects Checkmk installations with automatic agent updates enabled on vulnerable versions. Attackers must have local access to the system to exploit this.
💻 Affected Systems
- Checkmk
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Local attackers could read sensitive configuration data, credentials, or other information stored in agent update packages, potentially leading to privilege escalation or lateral movement.
Likely Case
Local users or compromised low-privilege accounts reading sensitive agent configuration data that could be used for further attacks.
If Mitigated
With proper access controls and monitoring, impact is limited to information disclosure from agent packages only.
🎯 Exploit Status
Exploitation requires local access to the system. The vulnerability is in file permissions, making exploitation straightforward for local users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.0p1, 2.3.0p32, 2.2.0p42, or later
Vendor Advisory: https://checkmk.com/werk/17099
Restart Required: No
Instructions:
1. Upgrade to patched version: 2.4.0p1, 2.3.0p32, or 2.2.0p42 depending on your current version. 2. For EOL versions (<= 2.1.0p49), upgrade to a supported version. 3. No restart required for the fix.
🔧 Temporary Workarounds
Manual permission correction
linuxManually set correct permissions on agent update packages
chmod 600 /path/to/agent/update/packages/*
chown root:root /path/to/agent/update/packages/*
Disable automatic agent updates
allTemporarily disable automatic agent updates until patched
# Edit Checkmk configuration to disable automatic updates
# Location varies by installation
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to Checkmk directories
- Monitor file access to agent update packages and alert on suspicious reads
🔍 How to Verify
Check if Vulnerable:
Check Checkmk version and verify if automatic agent updates are enabled. Examine permissions on agent update packages in /omd/sites/[site]/var/check_mk/agents/ (or similar location).Check Version:
omd versionVerify Fix Applied:
After patching, verify version is >= patched versions and check that agent update packages have restrictive permissions (600 or similar).📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns to agent update packages
- Multiple failed permission changes
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="checkmk" AND (event="file_access" OR event="permission_change") AND target_path="*/agents/*"