CVE-2021-22855
📋 TL;DR
CVE-2021-22855 is a critical deserialization vulnerability in the Soar Cloud System HR Portal that allows remote attackers to execute arbitrary commands by sending malicious serialized objects. This affects organizations using the vulnerable Soar Cloud System software, potentially leading to complete system compromise.
💻 Affected Systems
- Soar Cloud System HR Portal
📦 What is this software?
Hr Portal by Hr Portal Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to data theft, system manipulation, and installation of backdoors or malware.
If Mitigated
Limited impact with proper network segmentation, application firewalls, and monitoring detecting exploitation attempts.
🎯 Exploit Status
The vulnerability allows unauthenticated remote exploitation with publicly available technical details, making weaponization highly probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references - contact vendor for patched version
Vendor Advisory: https://www.chtsecurity.com/news/d334641f-2b28-4eab-a5ed-c6ec6740557e
Restart Required: Yes
Instructions:
1. Contact Soar Cloud System vendor for security patch 2. Apply patch to all affected systems 3. Restart application services 4. Verify fix implementation
🔧 Temporary Workarounds
Network Segmentation
allIsolate HR Portal from internet and restrict access to authorized networks only
WAF Rule Implementation
allDeploy web application firewall rules to block serialized object payloads
🧯 If You Can't Patch
- Implement strict network access controls to limit HR Portal exposure
- Deploy runtime application self-protection (RASP) or intrusion prevention systems
🔍 How to Verify
Check if Vulnerable:
Check if HR Portal accepts serialized objects without validation by testing with controlled payloads in non-production environmentCheck Version:
Contact vendor for version verification methods as specific commands not documentedVerify Fix Applied:
Test that serialized object deserialization is properly validated or disabled after patch application📡 Detection & Monitoring
Log Indicators:
- Unusual serialized object patterns in application logs
- Unexpected process executions from HR Portal service
Network Indicators:
- HTTP requests containing serialized object payloads to HR Portal endpoints
- Outbound connections from HR Portal to unexpected destinations
SIEM Query:
source="hr-portal-logs" AND (message="*serialized*" OR message="*deserializ*" OR process_execution="unusual")