CVE-2020-4476
📋 TL;DR
CVE-2020-4476 is an information disclosure vulnerability in IBM Sterling File Gateway where detailed technical error messages are exposed to remote attackers. This sensitive information could be used to facilitate further attacks against the system. Affected users include organizations running vulnerable versions of IBM Sterling File Gateway.
💻 Affected Systems
- IBM Sterling File Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain detailed system information that enables them to launch targeted follow-up attacks, potentially leading to full system compromise.
Likely Case
Attackers gather technical details about the system configuration that could be used for reconnaissance in preparation for further attacks.
If Mitigated
With proper error handling controls, only generic error messages are displayed, preventing information leakage.
🎯 Exploit Status
Exploitation involves triggering error conditions that cause the system to return detailed technical information instead of generic error messages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply IBM Sterling File Gateway 2.2.6.6 or 6.0.3.3 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/6367971
Restart Required: Yes
Instructions:
1. Download the appropriate fix from IBM Fix Central. 2. Apply the fix according to IBM Sterling File Gateway documentation. 3. Restart the application server. 4. Verify the fix is applied successfully.
🔧 Temporary Workarounds
Configure Error Message Suppression
allConfigure the application to return generic error messages instead of detailed technical information
Refer to IBM Sterling File Gateway documentation for error handling configuration
🧯 If You Can't Patch
- Implement network segmentation to restrict access to IBM Sterling File Gateway
- Deploy a web application firewall (WAF) to filter and sanitize error responses
🔍 How to Verify
Check if Vulnerable:
Check the IBM Sterling File Gateway version against affected ranges: 2.2.0.0-2.2.6.5 or 6.0.0.0-6.0.3.2Check Version:
Check the version in the IBM Sterling File Gateway administration console or configuration filesVerify Fix Applied:
Confirm the version is 2.2.6.6 or later for 2.2.x series, or 6.0.3.3 or later for 6.0.x series📡 Detection & Monitoring
Log Indicators:
- Unusual error patterns or detailed technical error messages in application logs
Network Indicators:
- HTTP responses containing detailed technical error information
SIEM Query:
Search for HTTP error responses containing technical details from IBM Sterling File Gateway systems