CVE-2023-47159
📋 TL;DR
IBM Sterling File Gateway versions 6.0.0.0 through 6.1.2.5 and 6.2.0.0 through 6.2.0.1 contain an information disclosure vulnerability where authenticated users can enumerate valid usernames by observing differences in system responses. This affects organizations using vulnerable versions of IBM's file transfer software.
💻 Affected Systems
- IBM Sterling File Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could map all valid usernames, enabling targeted credential attacks and facilitating lateral movement within the organization.
Likely Case
Malicious insiders or compromised accounts could gather intelligence about user accounts for subsequent attacks.
If Mitigated
With proper authentication monitoring and account lockout policies, impact is limited to information disclosure without direct system compromise.
🎯 Exploit Status
Exploitation requires authenticated access and involves observing response timing or content differences
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fix or upgrade to versions beyond affected ranges
Vendor Advisory: https://www.ibm.com/support/pages/node/7176083
Restart Required: Yes
Instructions:
1. Review IBM advisory 2. Apply recommended interim fix 3. Restart Sterling File Gateway services 4. Verify fix implementation
🔧 Temporary Workarounds
Access Restriction
allLimit authenticated user access to minimum required functionality
Monitoring Enhancement
allImplement enhanced logging for authentication attempts and user enumeration patterns
🧯 If You Can't Patch
- Implement strict access controls and network segmentation
- Deploy web application firewall rules to detect enumeration patterns
🔍 How to Verify
Check if Vulnerable:
Check IBM Sterling File Gateway version against affected ranges in vendor advisoryCheck Version:
Check product documentation for version query command specific to your installationVerify Fix Applied:
Verify version is updated beyond affected ranges and test for response consistency📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts with different usernames
- Patterns of similar requests with varying usernames
Network Indicators:
- Unusual authentication request patterns from single sources
SIEM Query:
source="sterling_gateway" AND (event_type="auth_failure" OR event_type="auth_attempt") | stats count by src_ip, username | where count > threshold