CVE-2020-26823
📋 TL;DR
This vulnerability allows unauthenticated attackers to compromise SAP Solution Manager systems due to missing authorization checks in the Upgrade Diagnostics Agent Connection Service. Attackers can impact system integrity and availability, affecting all organizations running the vulnerable version without proper network controls.
💻 Affected Systems
- SAP Solution Manager (JAVA stack)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, disrupt operations, and potentially pivot to other systems in the SAP landscape.
Likely Case
Service disruption and unauthorized access to sensitive diagnostic data, potentially leading to further exploitation of the SAP environment.
If Mitigated
Limited impact if proper network segmentation and authentication controls prevent unauthenticated access to the vulnerable service.
🎯 Exploit Status
Missing authorization checks make exploitation straightforward for attackers who can reach the vulnerable service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply SAP Security Note 2985866
Vendor Advisory: https://launchpad.support.sap.com/#/notes/2985866
Restart Required: Yes
Instructions:
1. Download SAP Note 2985866 from SAP Support Portal. 2. Apply the security patch following SAP's standard patching procedures. 3. Restart the affected SAP Solution Manager services.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to the Upgrade Diagnostics Agent Connection Service to only trusted hosts.
Use firewall rules to block external access to port 50013 (default Diagnostics Agent port)
Service Disablement
allTemporarily disable the vulnerable Upgrade Diagnostics Agent Connection Service if not required.
Consult SAP documentation for service disablement procedures specific to your installation
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SAP Solution Manager from untrusted networks
- Monitor for unusual connections to the Diagnostics Agent service and implement intrusion detection rules
🔍 How to Verify
Check if Vulnerable:
Check if SAP Solution Manager version is 7.20 and SAP Note 2985866 is not applied. Review system logs for unauthorized access attempts to the Diagnostics Agent service.Check Version:
Use SAP transaction SM51 or check the SAP system information in the SAP GUIVerify Fix Applied:
Verify SAP Note 2985866 is applied successfully and test that unauthenticated access to the Upgrade Diagnostics Agent Connection Service is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated connection attempts to the Upgrade Diagnostics Agent service
- Unusual process execution or service restarts
Network Indicators:
- Unexpected traffic to port 50013 from unauthorized sources
- Anomalous network patterns to/from SAP Solution Manager
SIEM Query:
source_port:50013 AND (NOT user_authenticated:true) OR event_description:"Upgrade Diagnostics Agent" AND result:"failure"