CVE-2022-28995
📋 TL;DR
Rengine v1.0.2 contains a remote code execution vulnerability through its YAML configuration function, allowing attackers to execute arbitrary code on affected systems. This affects all deployments running the vulnerable version of Rengine, particularly those exposed to untrusted YAML input.
💻 Affected Systems
- Rengine
📦 What is this software?
Rengine by Yogeshojha
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary commands with the privileges of the Rengine process, potentially leading to data theft, lateral movement, or ransomware deployment.
Likely Case
Remote code execution leading to web shell installation, cryptocurrency mining, or data exfiltration from the affected server.
If Mitigated
Limited impact if proper network segmentation, least privilege, and input validation are implemented, though RCE would still be possible.
🎯 Exploit Status
Public GitHub issue demonstrates the vulnerability. RCE via YAML deserialization is a well-known attack vector with mature exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.3 or later
Vendor Advisory: https://github.com/zongdeiqianxing/rengine/issues/1
Restart Required: Yes
Instructions:
1. Stop Rengine service. 2. Update to v1.0.3 or later via package manager or manual installation. 3. Restart Rengine service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable YAML configuration
allDisable YAML configuration functionality if not required
Modify Rengine configuration to disable YAML parsing
Network isolation
linuxRestrict network access to Rengine service
iptables -A INPUT -p tcp --dport [RENGINE_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [RENGINE_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted sources only
- Deploy web application firewall (WAF) with YAML deserialization attack detection rules
🔍 How to Verify
Check if Vulnerable:
Check Rengine version: grep -i version /path/to/rengine/config or check package manager. If version is 1.0.2, system is vulnerable.Check Version:
rengine --version or check installed package versionVerify Fix Applied:
Verify version is 1.0.3 or later and test YAML configuration functionality with safe input.📡 Detection & Monitoring
Log Indicators:
- Unusual YAML parsing errors
- Suspicious process execution from Rengine
- Unexpected network connections from Rengine process
Network Indicators:
- Unusual traffic to Rengine YAML endpoints
- Suspicious payloads containing YAML with executable code
SIEM Query:
process_name:"rengine" AND (event_type:"process_execution" OR event_type:"yaml_parse_error")