CVE-2021-33581
📋 TL;DR
CVE-2021-33581 is a Server-Side Request Forgery (SSRF) vulnerability in MashZone NextGen that allows attackers to interact with arbitrary TCP services by abusing the PPM connection availability check feature. This affects MashZone NextGen users through version 10.7 GA, potentially enabling attackers to probe internal networks or interact with internal services.
💻 Affected Systems
- Software AG MashZone NextGen
📦 What is this software?
Mashzone Nextgen by Softwareag
⚠️ Risk & Real-World Impact
Worst Case
Attackers could use the SSRF to interact with internal services, potentially leading to data exfiltration, internal network reconnaissance, or chaining with other vulnerabilities to achieve remote code execution.
Likely Case
Attackers would use this to scan internal networks, interact with internal APIs or services, and potentially access sensitive information from internal systems.
If Mitigated
With proper network segmentation and access controls, the impact would be limited to the specific network segments accessible from the MashZone server.
🎯 Exploit Status
Exploitation requires access to the vulnerable web service endpoint, which may require authentication depending on configuration
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 10.7 GA
Vendor Advisory: https://www.softwareag.com/corporate/products/az/mashzone_nextgen/default
Restart Required: Yes
Instructions:
1. Upgrade MashZone NextGen to a version after 10.7 GA. 2. Apply any available security patches from Software AG. 3. Restart the MashZone services.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to the MashZone server to prevent external exploitation
Authentication Enforcement
allEnsure the ZPrestoAdminWebService endpoint requires strong authentication
🧯 If You Can't Patch
- Implement strict network segmentation to limit what the MashZone server can access internally
- Deploy a web application firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check if MashZone NextGen version is 10.7 GA or earlier by examining the application version in the admin interface or configuration filesCheck Version:
Check application logs or admin console for version informationVerify Fix Applied:
Verify the MashZone NextGen version is after 10.7 GA and test the ZPrestoAdminWebService endpoint for SSRF behavior📡 Detection & Monitoring
Log Indicators:
- Unusual outbound connections from MashZone server to internal services
- Multiple failed connection attempts to various internal IPs/ports
Network Indicators:
- Unexpected TCP connections originating from MashZone server to internal network segments
SIEM Query:
source_ip=MASHZONE_SERVER_IP AND (dest_port=22 OR dest_port=80 OR dest_port=443 OR dest_port=3389) AND NOT dest_ip in ALLOWED_DESTINATIONS