CVE-2025-31144
📋 TL;DR
Quick Agent V3 and V2 contain an improper restriction of communication channel vulnerability (CWE-923) that allows remote unauthenticated attackers to attempt logins to arbitrary hosts via Windows systems running the agent. This affects organizations using SIOS's Quick Agent software for monitoring and management. Attackers can exploit this to potentially gain unauthorized access to systems.
💻 Affected Systems
- SIOS Quick Agent V3
- SIOS Quick Agent V2
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains administrative access to Windows systems running Quick Agent, leading to complete system compromise, data theft, and lateral movement within the network.
Likely Case
Attackers attempt brute-force or credential stuffing attacks against arbitrary hosts, potentially gaining access to systems with weak credentials or misconfigurations.
If Mitigated
With proper network segmentation, strong authentication controls, and monitoring, impact is limited to failed login attempts that can be detected and blocked.
🎯 Exploit Status
The vulnerability allows unauthenticated remote attackers to initiate login attempts to arbitrary hosts, making exploitation straightforward once the attack vector is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed versions
Vendor Advisory: https://siosapps.sios.jp/agent_info/20250425001.html
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL. 2. Download and install the latest version of Quick Agent from SIOS. 3. Restart the Quick Agent service on all affected systems. 4. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Quick Agent communication ports to only trusted management systems
Firewall Rules
windowsImplement firewall rules to block external access to Quick Agent ports
netsh advfirewall firewall add rule name="Block Quick Agent" dir=in action=block protocol=TCP localport=[QUICK_AGENT_PORT]
🧯 If You Can't Patch
- Implement strict network access controls to limit which systems can communicate with Quick Agent endpoints
- Enable detailed logging and monitoring for authentication attempts to Quick Agent services
🔍 How to Verify
Check if Vulnerable:
Check Quick Agent version against vendor advisory. Systems running affected versions on Windows are vulnerable.Check Version:
Check Quick Agent version through SIOS management console or agent configuration interfaceVerify Fix Applied:
Verify Quick Agent version has been updated to patched version specified in vendor advisory and restart service.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to Quick Agent services
- Failed login attempts from unexpected source IPs
- Multiple rapid authentication attempts
Network Indicators:
- Unexpected connections to Quick Agent ports (typically 2090-2099)
- Traffic patterns suggesting brute-force attacks
SIEM Query:
source="quick_agent" AND (event_type="authentication" AND result="failure") | stats count by src_ip