CVE-2011-4889
📋 TL;DR
This vulnerability in IBM WebSphere Application Server's Virtual Member Manager allows attackers to bypass authentication by using old passwords that should have been invalidated. It affects WAS versions 6.1, 7.0, and 8.0 when configured with Tivoli Directory Server. Remote attackers could gain unauthorized access to applications.
💻 Affected Systems
- IBM WebSphere Application Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of affected applications, allowing attackers to access sensitive data, execute unauthorized actions, or pivot to other systems.
Likely Case
Unauthorized access to applications using previously known credentials, potentially leading to data exposure or privilege escalation.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and monitoring in place.
🎯 Exploit Status
Exploitation requires knowledge of old passwords, making it dependent on credential reuse or previous compromise.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.1.0.43, 7.0.0.21, 8.0.0.2
Vendor Advisory: https://www-304.ibm.com/support/docview.wss?uid=swg21587015
Restart Required: Yes
Instructions:
1. Download appropriate fix pack from IBM Fix Central. 2. Apply fix pack following IBM installation guide. 3. Restart WebSphere Application Server. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable Tivoli Directory Server Integration
allTemporarily remove Tivoli Directory Server configuration from Virtual Member Manager
Modify WAS configuration files to remove Tivoli Directory Server references
Implement Password Policy Enforcement
allEnforce password expiration and prevent reuse through external mechanisms
Configure password policies in Tivoli Directory Server to expire passwords frequently
🧯 If You Can't Patch
- Implement network segmentation to isolate affected WAS instances
- Enable detailed authentication logging and monitor for suspicious login attempts
🔍 How to Verify
Check if Vulnerable:
Check WebSphere version via Admin Console or versionInfo.sh script, and verify Tivoli Directory Server configuration in Virtual Member Manager settings.Check Version:
./versionInfo.sh (Unix) or versionInfo.bat (Windows) in WAS_HOME/bin directoryVerify Fix Applied:
Confirm installed fix pack version matches or exceeds patched versions, and test password change functionality.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful login with old credentials
- Unusual login patterns from same user accounts
Network Indicators:
- Authentication traffic to WAS servers from unexpected sources
SIEM Query:
source="was_logs" AND (event_type="authentication" AND result="success" AND credential_age>threshold)