CVE-2020-4193
📋 TL;DR
CVE-2020-4193 is a critical authentication vulnerability in IBM Security Guardium that allows remote attackers to brute-force account credentials due to inadequate account lockout settings. This affects IBM Security Guardium 11.1 installations, potentially compromising administrative and user accounts.
💻 Affected Systems
- IBM Security Guardium
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through administrative account takeover, leading to data exfiltration, privilege escalation, and lateral movement within the network.
Likely Case
Unauthorized access to user accounts, credential harvesting, and potential data leakage from Guardium-managed databases.
If Mitigated
Limited impact with proper account lockout policies, strong passwords, and network segmentation preventing brute-force attempts.
🎯 Exploit Status
Exploitation requires no authentication but needs valid account names. Simple brute-force tools can automate attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fix from IBM Security Bulletin
Vendor Advisory: https://www.ibm.com/support/pages/node/6220132
Restart Required: Yes
Instructions:
1. Review IBM Security Bulletin. 2. Apply the recommended fix or upgrade. 3. Restart Guardium services. 4. Verify account lockout settings are properly configured.
🔧 Temporary Workarounds
Strengthen Account Lockout Policy
allConfigure aggressive account lockout thresholds (e.g., lock after 5 failed attempts) and implement strong password policies.
Configure via Guardium UI: Administration > Security Settings > Account Lockout Policy
Network Access Controls
allRestrict access to Guardium management interfaces to trusted IP ranges only.
Configure firewall rules to limit access to Guardium ports (e.g., 8443) from authorized networks
🧯 If You Can't Patch
- Implement network segmentation to isolate Guardium from untrusted networks
- Enable multi-factor authentication for all Guardium accounts
🔍 How to Verify
Check if Vulnerable:
Check Guardium version via UI (Help > About) or command line. Verify if account lockout settings allow unlimited failed login attempts.Check Version:
On Guardium appliance: gdversionVerify Fix Applied:
Verify Guardium version is updated per IBM advisory. Test account lockout by attempting failed logins to confirm lockout triggers appropriately.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from single IP
- Account lockout events
- Unusual login patterns outside business hours
Network Indicators:
- High volume of authentication requests to Guardium ports
- Traffic from unexpected geolocations
SIEM Query:
source="guardium" AND (event_type="failed_login" COUNT > 10 WITHIN 5min) OR event_type="account_lockout"