CVE-2023-0456
📋 TL;DR
This vulnerability in APICast's 3Scale OIDC module allows attackers to access unauthorized information from separate realms when token mismatches aren't properly evaluated. It affects systems using APICast with 3Scale OIDC integration. The flaw could expose sensitive data across different authentication realms.
💻 Affected Systems
- Red Hat 3scale API Management
- APICast
📦 What is this software?
Apicast by Redhat
Apicast by Redhat
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to sensitive data across multiple realms, potentially exposing confidential information, user credentials, or internal system data.
Likely Case
Unauthorized access to information in separate realms, potentially exposing API data, user information, or configuration details that should be isolated.
If Mitigated
Limited or no impact with proper authentication controls, network segmentation, and monitoring in place.
🎯 Exploit Status
Requires understanding of OIDC token validation and access to separate realms
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: APICast 2.11.0 and later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2023-0456
Restart Required: Yes
Instructions:
1. Update APICast to version 2.11.0 or later. 2. Apply the update through your deployment method (container, RPM, etc.). 3. Restart APICast services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable OIDC module
linuxTemporarily disable the 3Scale OIDC module if not required
Modify APICast configuration to remove OIDC module references
Network isolation
allIsolate realms at network level to prevent cross-realm access
Configure firewall rules to restrict communication between realms
🧯 If You Can't Patch
- Implement strict network segmentation between different realms
- Enhance monitoring and alerting for unauthorized cross-realm access attempts
🔍 How to Verify
Check if Vulnerable:
Check APICast version and verify if using 3Scale OIDC module with version below 2.11.0Check Version:
apicast --versionVerify Fix Applied:
Confirm APICast version is 2.11.0 or later and test OIDC token validation across realms📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts between realms
- OIDC token validation failures
- Cross-realm API calls
Network Indicators:
- Unexpected traffic between separate authentication realms
- OIDC token requests from unexpected sources
SIEM Query:
source="apicast" AND ("OIDC" OR "realm") AND ("unauthorized" OR "validation_failed")