CVE-2023-4501
📋 TL;DR
This critical authentication bypass vulnerability in OpenText COBOL products allows attackers to log in with any username regardless of password validity when LDAP authentication is misconfigured. Affected systems include Visual COBOL, COBOL Server, Enterprise Developer, and Enterprise Server versions 7.0-9.0 with specific patch levels. Organizations using these products with LDAP authentication are at risk.
💻 Affected Systems
- Visual COBOL
- COBOL Server
- Enterprise Developer
- Enterprise Server
- Enterprise Test Server
📦 What is this software?
Cobol Server by Microfocus
Cobol Server by Microfocus
Cobol Server by Microfocus
Cobol Server by Microfocus
Cobol Server by Microfocus
Enterprise Server by Microfocus
Enterprise Server by Microfocus
Enterprise Server by Microfocus
Enterprise Server by Microfocus
Enterprise Server by Microfocus
Visual Cobol by Microfocus
Visual Cobol by Microfocus
Visual Cobol by Microfocus
Visual Cobol by Microfocus
Visual Cobol by Microfocus
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to impersonate any user, access sensitive data, execute unauthorized transactions, and potentially pivot to other systems.
Likely Case
Unauthorized access to business applications and data, privilege escalation, and potential data exfiltration by attackers who discover the vulnerability.
If Mitigated
Limited impact if proper network segmentation, monitoring, and access controls prevent exploitation even if authentication fails.
🎯 Exploit Status
Exploitation requires access to the product interface but authentication bypass is trivial once accessed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Upcoming patch updates for each affected product
Vendor Advisory: https://portal.microfocus.com/s/article/KM000021287
Restart Required: Yes
Instructions:
1. Contact OpenText Support for product overlays and workaround instructions. 2. Apply the upcoming patch updates when available. 3. Restart affected services after patching.
🔧 Temporary Workarounds
Contact OpenText Support for workarounds
allOpenText provides specific workaround instructions through their support portal
🧯 If You Can't Patch
- Isolate affected systems from network access and implement strict firewall rules
- Disable LDAP authentication and use alternative authentication methods if possible
🔍 How to Verify
Check if Vulnerable:
Attempt to sign on to Visual COBOL or Enterprise Server component (e.g., ESCWA) using a valid username with incorrect passwordCheck Version:
Check product version through administration interface or consult product documentationVerify Fix Applied:
Test authentication with valid username and incorrect password after applying patches - should fail📡 Detection & Monitoring
Log Indicators:
- Successful logins with incorrect passwords
- Multiple failed login attempts followed by success
- Unusual user activity patterns
Network Indicators:
- Authentication traffic to LDAP servers from unexpected sources
- Unusual access patterns to COBOL applications
SIEM Query:
source="cobol_auth_logs" AND (event="login_success" AND previous_event="login_failure" within 5 minutes)