CVE-2021-29837
📋 TL;DR
This CSRF vulnerability in IBM Sterling B2B Integrator allows attackers to trick authenticated users into performing unauthorized actions by sending malicious requests from their browsers. It affects IBM Sterling B2B Integrator Standard Edition versions 5.2.0.0 through 6.1.1.0. The vulnerability could lead to data manipulation, configuration changes, or other malicious activities.
💻 Affected Systems
- IBM Sterling B2B Integrator Standard Edition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the B2B integration platform allowing data exfiltration, system configuration changes, or disruption of business-to-business transactions.
Likely Case
Unauthorized data access or modification, configuration changes affecting business processes, or privilege escalation within the application.
If Mitigated
Limited impact with proper CSRF protections and user awareness, potentially no successful exploitation.
🎯 Exploit Status
Exploitation requires tricking an authenticated user into visiting a malicious page while logged into the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fix or upgrade to version 6.1.1.1 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/6495907
Restart Required: Yes
Instructions:
1. Download the appropriate fix from IBM Fix Central. 2. Apply the interim fix following IBM's installation instructions. 3. Restart the IBM Sterling B2B Integrator service. 4. Verify the fix is applied correctly.
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd anti-CSRF tokens to all state-changing requests
SameSite Cookie Attribute
allSet SameSite=Strict or Lax attributes on session cookies
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block CSRF attempts
- Educate users about CSRF risks and safe browsing practices
🔍 How to Verify
Check if Vulnerable:
Check the IBM Sterling B2B Integrator version via the admin console or configuration filesCheck Version:
Check the version in the application's admin interface or configuration filesVerify Fix Applied:
Verify the applied fix version in the admin console or check for CSRF protection headers in requests📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes
- Unauthorized actions from authenticated users
- Multiple failed state-changing requests
Network Indicators:
- Requests without proper referrer headers
- State-changing requests from unexpected sources
SIEM Query:
source="sterling-b2b" AND (action="modify" OR action="delete" OR action="create") AND referrer NOT CONTAINS "expected-domain"