CVE-2021-21482
📋 TL;DR
CVE-2021-21482 allows unauthorized attackers on the same network subnet as SAP NetWeaver MDM servers to brute-force administrative passwords. Successful exploitation grants administrative privileges and access to sensitive master data. This affects SAP NetWeaver Master Data Management installations where security guidelines for administrative accounts weren't properly followed.
💻 Affected Systems
- SAP NetWeaver Master Data Management
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control over MDM, accesses all sensitive master data, modifies critical business data, and potentially pivots to other systems.
Likely Case
Unauthorized user with network access brute-forces weak administrative passwords, gains MDM administrative privileges, and accesses sensitive master data.
If Mitigated
With proper network segmentation and strong password policies, attackers cannot reach the MDM server or brute-force passwords effectively.
🎯 Exploit Status
Brute-force attacks are well-understood techniques requiring only network access to the MDM server subnet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply SAP Note 3017908
Vendor Advisory: https://launchpad.support.sap.com/#/notes/3017908
Restart Required: Yes
Instructions:
1. Download and apply SAP Note 3017908. 2. Review and implement security guidelines for administrative accounts. 3. Restart affected MDM services.
🔧 Temporary Workarounds
Network Segmentation
allIsolate MDM servers to prevent unauthorized network access
Configure firewall rules to restrict access to MDM servers from trusted subnets only
Strong Password Policy
allImplement complex passwords and account lockout policies
Set password complexity requirements: minimum 12 characters, mixed case, numbers, symbols
Configure account lockout after 5 failed attempts
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MDM servers from untrusted networks
- Enforce strong password policies with complexity requirements and account lockout mechanisms
🔍 How to Verify
Check if Vulnerable:
Check if running SAP NetWeaver MDM versions 710 or 710.750 without SAP Note 3017908 appliedCheck Version:
Check SAP system information via transaction code SM51 or system status reportsVerify Fix Applied:
Verify SAP Note 3017908 is applied and security guidelines for administrative accounts are implemented📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts to MDM administrative accounts
- Successful logins from unusual IP addresses
Network Indicators:
- Brute-force attack patterns targeting MDM server ports
- Unusual traffic from internal subnets to MDM servers
SIEM Query:
source="mdm_server" AND (event_type="authentication_failure" count>10 within 5min OR event_type="authentication_success" from new_ip)