CVE-2020-4385
📋 TL;DR
CVE-2020-4385 is a critical vulnerability in IBM Verify Gateway (IVG) versions 1.0.0 and 1.0.1 where hard-coded credentials allow attackers to bypass authentication mechanisms. This affects organizations using these specific IVG versions for identity verification services. Attackers can use these credentials to gain unauthorized access to the gateway and potentially connected systems.
💻 Affected Systems
- IBM Verify Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the IVG system, allowing attackers to intercept or manipulate authentication flows, access sensitive user data, and pivot to connected backend systems.
Likely Case
Unauthorized administrative access to the IVG console, enabling configuration changes, credential harvesting, and potential denial of service.
If Mitigated
Limited impact if the system is isolated behind firewalls with strict network segmentation and access controls, though the hard-coded credentials still pose a risk.
🎯 Exploit Status
The vulnerability details including specific credentials are publicly documented in IBM's advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.2 and later
Vendor Advisory: https://www.ibm.com/support/pages/node/6251291
Restart Required: Yes
Instructions:
1. Download IBM Verify Gateway version 1.0.2 or later from IBM Fix Central. 2. Backup current configuration and data. 3. Stop the IVG service. 4. Install the updated version. 5. Restart the IVG service. 6. Verify functionality.
🔧 Temporary Workarounds
Network Isolation
allRestrict network access to IVG systems using firewalls to only allow connections from authorized sources.
Credential Rotation
allIf possible, manually change any hard-coded credentials, though this may break functionality and is not recommended over patching.
🧯 If You Can't Patch
- Immediately isolate the IVG system from all networks except absolutely necessary connections
- Implement strict network monitoring and alerting for any authentication attempts to the IVG system
🔍 How to Verify
Check if Vulnerable:
Check the IVG version via the admin console or configuration files. If version is 1.0.0 or 1.0.1, the system is vulnerable.Check Version:
Check the IVG installation directory for version files or use the admin interface at https://[ivg-host]:9443/ibm/consoleVerify Fix Applied:
After patching, verify the version shows 1.0.2 or later and test authentication with previously known hard-coded credentials (should fail).📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts using known hard-coded credentials
- Successful logins from unexpected IP addresses
- Configuration changes made by unauthorized users
Network Indicators:
- Authentication requests to IVG endpoints from untrusted networks
- Unusual traffic patterns to IVG administrative interfaces
SIEM Query:
source="ivg_logs" AND (event_type="authentication" AND (username="hardcoded_user" OR status="success" from unexpected_ip))