CVE-2023-37863
📋 TL;DR
This vulnerability allows remote attackers with SNMPv2 write privileges to gain full administrative access to PHOENIX CONTACT WP 6xxx series web panels by sending a specially crafted SNMP request. It affects users of these industrial control system devices running versions prior to 4.0.10, potentially compromising critical infrastructure operations.
💻 Affected Systems
- PHOENIX CONTACT WP 6xxx series web panels
📦 What is this software?
Wp 6070 Wvps Firmware by Phoenixcontact
Wp 6101 Wxps Firmware by Phoenixcontact
Wp 6121 Wxps Firmware by Phoenixcontact
Wp 6156 Whps Firmware by Phoenixcontact
Wp 6185 Whps Firmware by Phoenixcontact
Wp 6215 Whps Firmware by Phoenixcontact
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full control over the device, enabling them to disrupt industrial processes, steal sensitive data, or use the device as a foothold for further network attacks, leading to operational downtime or safety hazards.
Likely Case
Attackers exploit the vulnerability to gain administrative access, allowing them to modify device configurations, execute arbitrary commands, or disrupt panel functionality in industrial environments.
If Mitigated
With proper controls like network segmentation and SNMP access restrictions, impact is limited to isolated network segments, reducing the risk of widespread compromise.
🎯 Exploit Status
Exploitation requires SNMPv2 write access, but the attack vector is straightforward once privileges are obtained; no public proof-of-concept is known, but weaponization is likely due to the critical nature of the devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.10
Vendor Advisory: https://cert.vde.com/en/advisories/VDE-2023-018/
Restart Required: Yes
Instructions:
1. Download firmware version 4.0.10 from PHOENIX CONTACT's official support portal. 2. Backup device configurations. 3. Apply the firmware update via the device's web interface or management tool. 4. Restart the device to complete the installation. 5. Verify the update by checking the firmware version in the device settings.
🔧 Temporary Workarounds
Disable SNMPv2 Write Access
allRestrict SNMPv2 write privileges to prevent exploitation by limiting SNMP access to read-only or disabling it entirely if not needed.
Configure SNMP settings via device web interface: set SNMPv2 community strings to read-only or disable SNMP service.
Network Segmentation
allIsolate the web panels in a separate network segment with strict firewall rules to limit SNMP traffic to trusted sources only.
Implement firewall rules to block SNMP (UDP port 161) from untrusted networks; allow only from authorized management stations.
🧯 If You Can't Patch
- Implement strict network access controls to limit SNMP traffic to trusted IP addresses only.
- Monitor SNMP logs for unusual activity and disable SNMPv2 write privileges if possible.
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the device's web interface or via SNMP query; if version is below 4.0.10, the device is vulnerable.Check Version:
Use SNMP query: snmpget -v2c -c [community_string] [device_ip] .1.3.6.1.2.1.1.1.0 to check system description for version info, or access the web panel's admin interface.Verify Fix Applied:
After patching, confirm the firmware version is 4.0.10 or higher in the device settings and test SNMP write access to ensure it no longer grants unauthorized control.📡 Detection & Monitoring
Log Indicators:
- Unusual SNMP write requests from unauthorized sources in device logs
- Failed or successful administrative access attempts via SNMP
Network Indicators:
- SNMP traffic (UDP port 161) from unexpected IP addresses
- Anomalous command execution patterns in SNMP packets
SIEM Query:
Example SIEM query: search source_ip=[device_ip] AND protocol=UDP AND port=161 AND (event_type="SNMP write" OR command="set")