CVE-2021-39070
📋 TL;DR
This critical authentication bypass vulnerability in IBM Security Verify Access allows an attacker to authenticate as any user on the system when the advanced access control authentication service is enabled. It affects IBM Security Verify Access versions 10.0.0.0, 10.0.1.0, and 10.0.2.0. Organizations using these versions with the advanced access control feature enabled are at immediate risk.
💻 Affected Systems
- IBM Security Verify Access
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where an attacker gains administrative access to all user accounts, potentially leading to data theft, privilege escalation, and full control over the authentication infrastructure.
Likely Case
Attackers authenticate as legitimate users to access sensitive applications and data, potentially leading to data breaches, unauthorized transactions, and lateral movement within the network.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the authentication system itself, though credential misuse could still occur.
🎯 Exploit Status
The vulnerability allows authentication bypass without credentials, making exploitation straightforward once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.0.2.1 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/6552318
Restart Required: Yes
Instructions:
1. Download the fix from IBM Fix Central. 2. Apply the fix to all affected IBM Security Verify Access instances. 3. Restart the services. 4. Verify the fix is applied correctly.
🔧 Temporary Workarounds
Disable Advanced Access Control
allTemporarily disable the advanced access control authentication service until patching can be completed.
Consult IBM documentation for specific disable commands based on your deployment
🧯 If You Can't Patch
- Implement strict network access controls to limit access to IBM Security Verify Access instances
- Enable detailed authentication logging and monitor for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check if running IBM Security Verify Access version 10.0.0.0, 10.0.1.0, or 10.0.2.0 with advanced access control enabled.Check Version:
Consult IBM Security Verify Access administration console or documentation for version check commands specific to your deployment.Verify Fix Applied:
Verify the version is updated to 10.0.2.1 or later and test authentication functionality.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful authentication from same source
- Authentication logs showing user accounts accessing from unusual locations or times
- Administrative actions performed by non-admin users
Network Indicators:
- Unusual authentication traffic patterns to IBM Security Verify Access endpoints
- Authentication requests bypassing normal credential validation
SIEM Query:
source="ibm_verify_access" AND (event_type="authentication" AND result="success") | stats count by src_ip, user | where count > threshold