CVE-2025-23193
📋 TL;DR
CVE-2025-23193 is an information disclosure vulnerability in SAP NetWeaver Server ABAP that allows unauthenticated attackers to determine whether specific user accounts exist by observing server response differences. This affects organizations running vulnerable SAP NetWeaver ABAP systems, potentially exposing user enumeration data.
💻 Affected Systems
- SAP NetWeaver Server ABAP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could enumerate valid user accounts, facilitating targeted credential attacks or social engineering campaigns against identified users.
Likely Case
Attackers discover valid usernames, enabling more focused brute-force or phishing attacks against those accounts.
If Mitigated
With proper network segmentation and access controls, impact is limited to enumeration of accounts that may already be known through other means.
🎯 Exploit Status
Exploitation requires sending crafted requests and analyzing response differences; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply SAP Security Note 3561264
Vendor Advisory: https://me.sap.com/notes/3561264
Restart Required: Yes
Instructions:
1. Download SAP Note 3561264 from SAP Support Portal. 2. Apply the correction instructions per SAP standard procedures. 3. Restart affected SAP systems.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to SAP NetWeaver ABAP systems to trusted IP addresses only
Web Application Firewall Rules
allConfigure WAF to block requests that appear to be user enumeration attempts
🧯 If You Can't Patch
- Implement strict network segmentation to limit access to SAP systems
- Monitor for unusual authentication patterns and user enumeration attempts
🔍 How to Verify
Check if Vulnerable:
Test by sending requests with different usernames and observing response differences; consult SAP Note 3561264 for specific testing guidance.Check Version:
Transaction ST03N in SAP system to check applied notes and versionsVerify Fix Applied:
Verify SAP Note 3561264 is applied in system and test that user enumeration no longer works.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts with different usernames
- Unusual pattern of requests to user-related endpoints
Network Indicators:
- Repeated requests to SAP authentication endpoints from single sources
- Pattern of requests with incremental username variations
SIEM Query:
source="sap_netweaver" AND (event_type="authentication" OR uri="*/sap/*/user*") AND count by src_ip > threshold