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Command Injection Vulnerability in CPCI85 Firmware of SICAM A8000 Devices

Act Now9.8SSA-472454Apr 11, 2023
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

The CPCI85 firmware of SICAM A8000 CP-8031 and CP-8050 modules is affected by an unauthenticated command injection vulnerability (CWE-77) that allows an attacker to execute arbitrary commands remotely. The vulnerability stems from insufficient input validation in the command processing logic. An attacker on the network can exploit this without any credentials or user interaction to achieve remote code execution on the communication processor, potentially disrupting substation automation, protection logic, or supervisory control functions.

What this means
What could happen
An attacker on the network could inject arbitrary commands into the SICAM A8000 communication processor without authentication, allowing remote code execution that could disrupt power grid monitoring, control signaling, or data acquisition operations.
Who's at risk
Electric utilities and generation facilities operating Siemens SICAM A8000 systems for substation automation, protection relaying, or wide-area monitoring. Specifically affects organizations using CP-8031 or CP-8050 communication processor modules in real-time grid control environments.
How it could be exploited
An attacker sends a specially crafted network request to the CP-8031 or CP-8050 module on port 502 (Modbus) or other accessible management interfaces. The module does not validate input before passing it to the command shell, allowing the attacker to execute arbitrary system commands with the privileges of the device process.
Prerequisites
  • Network connectivity to the CP-8031 or CP-8050 module
  • The device is running firmware version earlier than CPCI85 V05
  • No authentication credentials required
Remotely exploitableNo authentication requiredLow complexity attackCritical CVSS score (9.8)High impact on grid operationsAffects control system networking
Exploitability
Moderate exploit probability (EPSS 2.9%)
Affected products (2)
2 with fix
ProductAffected VersionsFix Status
CP-8031 MASTER MODULE (6MF2803-1AA00)< CPCI85 V05CPCI85 V05 or later
CP-8050 MASTER MODULE (6MF2805-0AA00)< CPCI85 V05CPCI85 V05 or later
Remediation & Mitigation
0/3
Do now
0/1
WORKAROUNDRestrict network access to the CP-8031/CP-8050 management interfaces using firewall rules; only allow connections from authorized engineering workstations and SCADA/control network segments
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

CP-8031 MASTER MODULE (6MF2803-1AA00)
HOTFIXUpdate CPCI85 firmware to version V05 or later on all CP-8031 MASTER MODULE (6MF2803-1AA00) and CP-8050 MASTER MODULE (6MF2805-0AA00) devices
Long-term hardening
0/1
HARDENINGIsolate SICAM A8000 communication processors on a dedicated management VLAN with strict ingress/egress controls
View full Siemens ProductCERT advisory
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