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Siemens SCALANCE SC-600 Family

Plan Patch7.8ICS-CERT ICSA-22-349-18Dec 13, 2022
Attack VectorLocal
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary

Multiple vulnerabilities in third-party firmware components of the SCALANCE SC-600 family managed switches (CWE-787 out-of-bounds write, CWE-416 use-after-free, CWE-770 allocation with excessive size) could allow local attackers to cause denial of service, corrupt memory, or execute arbitrary code. The SC-600 series is a key network appliance in industrial control system architectures, used to segregate and manage traffic between engineering networks and operational technology networks. All versions before 3.0 are affected.

What this means
What could happen
Memory corruption or code execution on a SCALANCE managed switch could allow an attacker to disrupt network connectivity to critical infrastructure devices (PLCs, RTUs, HMIs), causing loss of process visibility and control.
Who's at risk
This affects water and electric utilities, wastewater treatment plants, and any facility using Siemens SCALANCE SC-600 managed industrial switches for network segregation in control system environments. Organizations should inventory all SC622-2C, SC626-2C, SC632-2C, SC636-2C, SC642-2C, and SC646-2C models.
How it could be exploited
An attacker with local access to the device (via USB, serial console, or already-present network malware) could exploit third-party component vulnerabilities in the firmware to corrupt memory or execute arbitrary code on the switch. This would compromise the device's ability to route and filter network traffic to your control systems.
Prerequisites
  • Physical or logical local access to SCALANCE SC-600 device
  • Device running firmware version below 3.0
  • No administrative credentials required for exploitation
No authentication required for local exploitationLow complexity attackHigh CVSS score (7.8)Affects network infrastructure supporting safety systemsMemory corruption and code execution possible
Exploitability
Moderate exploit probability (EPSS 4.5%)
Affected products (6)
6 with fix
ProductAffected VersionsFix Status
SCALANCE SC622-2C<V3.03.0
SCALANCE SC626-2C<V3.03.0
SCALANCE SC632-2C<V3.03.0
SCALANCE SC636-2C<V3.03.0
SCALANCE SC642-2C<V3.03.0
SCALANCE SC646-2C<V3.03.0
Remediation & Mitigation
0/5
Do now
0/3
HARDENINGRestrict physical access to SCALANCE switches (console ports, USB); use cable locks if available
WORKAROUNDDisable or restrict remote management protocols (SSH, HTTPS) to authorized workstations only via firewall rules
HARDENINGReview and document which control system devices rely on each SCALANCE switch for connectivity; prioritize firmware updates for devices in safety-critical paths
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SCALANCE SC-600 family devices to firmware version 3.0 or later
Long-term hardening
0/1
HARDENINGImplement network segmentation to isolate SCALANCE management interfaces from non-essential networks
View full CISA ICS-CERT advisory
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Siemens SCALANCE SC-600 Family | CVSS 7.8 - OTPulse