CVE-2020-9406
📋 TL;DR
CVE-2020-9406 is an unauthenticated eval injection vulnerability in IBL Online Weather's Auxiliary Service queryBCP method. This allows remote attackers to execute arbitrary code on affected systems without authentication. Organizations using IBL Online Weather versions before 4.3.5a are affected.
💻 Affected Systems
- IBL Online Weather
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution leading to data theft, ransomware deployment, or use as a foothold for lateral movement within the network.
Likely Case
Remote code execution allowing attackers to install backdoors, steal sensitive data, or disrupt weather service operations.
If Mitigated
No impact if the service is properly patched or network access is restricted to trusted sources only.
🎯 Exploit Status
Public proof-of-concept code exists, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.5a
Vendor Advisory: https://github.com/dawid-czarnecki/public-vulnerabilities/tree/master/Online_Weather
Restart Required: Yes
Instructions:
1. Download IBL Online Weather version 4.3.5a or later from official vendor sources. 2. Backup current installation and configuration. 3. Stop the Online Weather service. 4. Install the updated version. 5. Restart the service. 6. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to the Auxiliary Service port to only trusted IP addresses or internal networks.
iptables -A INPUT -p tcp --dport [AUX_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [AUX_PORT] -j DROP
Service Disablement
linuxTemporarily disable the Auxiliary Service if not required for operations.
systemctl stop [SERVICE_NAME]
systemctl disable [SERVICE_NAME]
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate the vulnerable system from untrusted networks.
- Deploy web application firewall (WAF) rules to block eval injection patterns targeting the queryBCP method.
🔍 How to Verify
Check if Vulnerable:
Check the installed version of IBL Online Weather. If version is earlier than 4.3.5a, the system is vulnerable.Check Version:
Check the application's admin interface or configuration files for version information.Verify Fix Applied:
Verify the installed version is 4.3.5a or later and test that the queryBCP method no longer accepts arbitrary eval input.📡 Detection & Monitoring
Log Indicators:
- Unusual eval() or system() calls in application logs
- Multiple failed authentication attempts followed by successful queryBCP requests
- Suspicious command execution patterns in service logs
Network Indicators:
- Unusual outbound connections from the weather service system
- Traffic to the Auxiliary Service port from unexpected sources
- Patterns of data exfiltration following queryBCP requests
SIEM Query:
source="online_weather.log" AND ("queryBCP" OR "eval") AND (status="200" OR status="success")🔗 References
- https://github.com/dawid-czarnecki/public-vulnerabilities/tree/master/Online_Weather
- https://zigrin.com/advisories/online-weather-command-injection-in-querybcp-method/
- https://github.com/dawid-czarnecki/public-vulnerabilities/tree/master/Online_Weather
- https://zigrin.com/advisories/online-weather-command-injection-in-querybcp-method/
