CVE-2018-10866
📋 TL;DR
CVE-2018-10866 is an authorization bypass vulnerability in Red Hat Certification 7 that allows unauthenticated attackers to delete system XML files containing host information. This affects Red Hat Certification installations with the vulnerable /configuration view accessible. The vulnerability enables unauthorized file deletion without proper access controls.
💻 Affected Systems
- Red Hat Certification
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete loss of system configuration data, potential service disruption, and unauthorized modification of critical host information files.
Likely Case
Unauthorized deletion of host information XML files, potentially disrupting certification processes and causing data loss.
If Mitigated
No impact if proper authentication and authorization controls are implemented or if the vulnerable endpoint is inaccessible.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it requires no authentication and involves simple HTTP requests to delete files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Red Hat Certification 7 with security updates applied (check specific advisory for version)
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2018-10866
Restart Required: Yes
Instructions:
1. Apply Red Hat security updates via yum update. 2. Restart the Red Hat Certification service. 3. Verify the patch is applied by checking version and testing the vulnerable endpoint.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Red Hat Certification service to trusted networks only
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port protocol="tcp" port="PORT_NUMBER" accept'
firewall-cmd --reload
Authentication Enforcement
linuxEnsure proper authentication is required for all configuration endpoints
# Configure authentication in Red Hat Certification configuration files
# Refer to Red Hat documentation for specific authentication setup
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Red Hat Certification from untrusted networks
- Deploy a web application firewall (WAF) to block unauthorized access to /configuration endpoints
🔍 How to Verify
Check if Vulnerable:
Test if unauthenticated HTTP DELETE requests to /configuration endpoint succeed in deleting system XML filesCheck Version:
rpm -q redhat-certificationVerify Fix Applied:
Verify that authentication is now required for /configuration operations and unauthorized requests are rejected📡 Detection & Monitoring
Log Indicators:
- Unauthenticated DELETE requests to /configuration endpoints
- Failed authentication attempts followed by configuration changes
- Unexpected deletion of system XML files
Network Indicators:
- HTTP DELETE requests to /configuration paths from unauthorized sources
- Unusual traffic patterns to certification service configuration endpoints
SIEM Query:
source="redhat-certification-logs" AND (uri_path="/configuration" AND http_method="DELETE" AND auth_status="unauthenticated")