CVE-2021-33207
📋 TL;DR
CVE-2021-33207 is a critical deserialization vulnerability in MashZone NextGen's HTTP client that allows remote code execution when processing HTTP responses with status code 570. This affects all organizations running vulnerable versions of MashZone NextGen through network-accessible instances.
💻 Affected Systems
- Software AG MashZone NextGen
📦 What is this software?
Mashzone Nextgen by Softwareag
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to complete data exfiltration, lateral movement within the network, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to execute arbitrary commands, steal sensitive data, and disrupt business operations.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only affecting isolated MashZone instances.
🎯 Exploit Status
Exploitation requires sending crafted HTTP responses with status code 570 to trigger deserialization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 10.7 GA
Vendor Advisory: https://www.softwareag.com/corporate/products/az/mashzone_nextgen/default
Restart Required: Yes
Instructions:
1. Upgrade to MashZone NextGen version after 10.7 GA. 2. Apply all security patches from Software AG. 3. Restart the MashZone NextGen service.
🔧 Temporary Workarounds
Network Filtering
allBlock or filter HTTP responses with status code 570 at network perimeter or WAF
Access Control
allRestrict network access to MashZone NextGen instances to trusted sources only
🧯 If You Can't Patch
- Isolate MashZone NextGen instances in separate network segments with strict firewall rules
- Implement application-level monitoring for unusual HTTP 570 responses and deserialization attempts
🔍 How to Verify
Check if Vulnerable:
Check MashZone NextGen version - if it's 10.7 GA or earlier, it's vulnerable.Check Version:
Check MashZone NextGen administration console or installation documentation for version information.Verify Fix Applied:
Verify version is after 10.7 GA and test with controlled HTTP 570 responses.📡 Detection & Monitoring
Log Indicators:
- HTTP responses with status code 570
- Unusual deserialization errors in application logs
- Unexpected process execution
Network Indicators:
- HTTP traffic containing status code 570 responses
- Unusual outbound connections from MashZone servers
SIEM Query:
source="mashzone_logs" AND (status=570 OR "deserialization" OR "java.io.ObjectInputStream")