CVE-2024-56512
📋 TL;DR
This vulnerability allows authenticated users with permission to create Process Groups in Apache NiFi to bypass authorization checks for Parameter Contexts, Controller Services, and Parameter Providers. Attackers can access non-sensitive parameter values and use unauthorized components when creating new Process Groups. Only deployments using component-based authorization policies are affected.
💻 Affected Systems
- Apache NiFi
📦 What is this software?
Nifi by Apache
⚠️ Risk & Real-World Impact
Worst Case
Unauthorized users gain access to sensitive configuration parameters or leverage privileged controller services to escalate privileges or access restricted data.
Likely Case
Authenticated users bypass intended access controls to view parameter values or use controller services they shouldn't have access to, potentially leading to information disclosure or unauthorized operations.
If Mitigated
With proper network segmentation and minimal user permissions, impact is limited to authorized users accessing resources slightly beyond their intended scope.
🎯 Exploit Status
Exploitation requires authenticated access and Process Group creation permissions; attack is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apache NiFi 2.1.0
Vendor Advisory: https://lists.apache.org/thread/cjc8fns5kjsho0s7vonlnojokyfx47wn
Restart Required: Yes
Instructions:
1. Backup current NiFi configuration and data. 2. Download Apache NiFi 2.1.0 from official Apache website. 3. Stop NiFi service. 4. Replace installation with new version. 5. Restore configuration if needed. 6. Start NiFi service.
🔧 Temporary Workarounds
Restrict Process Group Creation Permissions
allLimit which users can create Process Groups to only trusted administrators.
nifi.sh set-permissions --user <username> --action read,write --resource /process-groups/*
Use Global Authorization Policies
allSwitch from component-based authorization to global policies if feasible for your deployment.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate NiFi instances from sensitive systems.
- Audit and minimize user permissions, especially Process Group creation rights, and monitor for unusual activity.
🔍 How to Verify
Check if Vulnerable:
Check NiFi version via web UI or configuration files; versions 1.10.0 to 2.0.0 are vulnerable if using component-based authorization.Check Version:
grep 'nifi.version' /path/to/nifi/conf/nifi.propertiesVerify Fix Applied:
Confirm version is 2.1.0 or higher and test that authorization checks now properly validate Parameter Contexts and Controller Services during Process Group creation.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Parameter Contexts or Controller Services via Process Group creation logs
- Multiple Process Group creation events from single user in short time
Network Indicators:
- Unusual API calls to create Process Groups with parameter bindings
SIEM Query:
source="nifi" AND (event="Process Group Created" OR event="Parameter Context Accessed") AND user NOT IN [authorized_users]