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Siemens SICAM A8000

Monitor6.6ICS-CERT ICSA-24-011-08Jan 9, 2024
Attack VectorNetwork
Auth RequiredHigh
ComplexityHigh
User InteractionNone needed
Summary

The CPCI85 firmware in Siemens SICAM A8000 CP-8031 (6MF2803-1AA00) and CP-8050 (6MF2805-0AA00) master modules contains a command injection vulnerability. An authenticated remote attacker could inject commands during the device startup process that execute with root privileges. The vulnerability requires high attack complexity and valid credentials with network configuration modification rights. Siemens has released CPCI85 V05.20 to correct this issue.

What this means
What could happen
An authenticated attacker could inject commands into the device startup process that execute with root privileges, allowing them to take control of the CP-8031 or CP-8050 master module and potentially disrupt communication or monitoring functions in the SICAM A8000 system.
Who's at risk
Water utilities and municipal electric utilities operating Siemens SICAM A8000 substation automation systems should care about this issue. Specifically, this affects organizations using CP-8031 or CP-8050 master modules for communication and control coordination in substations.
How it could be exploited
An attacker with valid credentials for network configuration changes could craft a malicious command injection payload. This payload would be executed during device startup with root-level privileges, potentially allowing the attacker to modify system settings, disable monitoring, or disrupt the master module's ability to manage the substation automation system.
Prerequisites
  • Valid credentials for network configuration modification on the device
  • Network access to the CP-8031 or CP-8050 master module
  • Ability to trigger or wait for device startup/reboot
  • Firmware version below CPCI85 V05.20
Requires valid credentials for exploitationHigh attack complexityRequires device restart to execute injected commandsAffects critical substation automation master modules
Exploitability
Low exploit probability (EPSS 0.3%)
Affected products (2)
2 with fix
ProductAffected VersionsFix Status
CP-8031 MASTER MODULE (6MF2803-1AA00)<CPCI85 V05.20CPCI85 V05.20 or later
CP-8050 MASTER MODULE (6MF2805-0AA00)<CPCI85 V05.20CPCI85 V05.20 or later
Remediation & Mitigation
0/7
Do now
0/2
HARDENINGReview and restrict the list of users allowed to modify network configuration on the device
HARDENINGEnforce strong password requirements for accounts that can modify network configuration
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HOTFIXUpdate CP-8031 MASTER MODULE to CPCI85 V05.20 or later version
HOTFIXUpdate CP-8050 MASTER MODULE to CPCI85 V05.20 or later version
Long-term hardening
0/3
HARDENINGRestrict network access to the CP-8031 and CP-8050 modules behind a firewall; do not expose to the internet
HARDENINGIsolate SICAM A8000 control system network from business networks using appropriate network segmentation
HARDENINGIf remote access is required, use a Virtual Private Network (VPN) with current patches
View full CISA ICS-CERT advisory
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