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Siemens SCALANCE M-800, RUGGEDCOM RM1224

Plan Patch7.2ICS-CERT ICSA-24-228-01Aug 13, 2024
Attack VectorNetwork
Auth RequiredHigh
ComplexityLow
User InteractionNone needed
Summary

Multiple vulnerabilities in Siemens SCALANCE M-800 family routers and RUGGEDCOM RM1224 LTE cellular gateways (firmware versions prior to V8.1) involve insufficient input validation (CWE-20), improper resource handling (CWE-400, CWE-488), and sensitive information exposure in log files (CWE-532). An authenticated attacker can exploit these flaws through the device management interface to cause command injection, resource exhaustion, or information disclosure. Siemens has released firmware version 8.1 or later for all affected products to remediate these issues.

What this means
What could happen
An attacker with administrative credentials could exploit multiple input validation and resource handling flaws to execute arbitrary commands on affected routers and cellular gateways, potentially disrupting WAN connectivity for critical ICS networks or altering routing and firewall rules.
Who's at risk
Water authorities, electric utilities, and other critical infrastructure operators using Siemens SCALANCE M-800 series routers (ADSL, SHDSL, cellular variants) or RUGGEDCOM RM1224 LTE cellular gateways for WAN connectivity to remote substations, pump stations, treatment facilities, or distributed control systems. These devices are common in industrial networks where they provide redundant WAN and LTE backup links to headquarters or remote monitoring centers.
How it could be exploited
An attacker with valid engineering workstation or administrative credentials can access the device management interface (web UI or SSH) and send malformed input to trigger insufficient input validation or resource exhaustion conditions. This allows command injection or denial of service that could affect network routing, VPN termination, or cellular connectivity for remote industrial sites.
Prerequisites
  • Valid administrative or engineering workstation credentials
  • Network access to device management interface (HTTP/HTTPS port 80/443 or SSH port 22)
  • Device running firmware version prior to V8.1
Requires valid administrative credentialsAffects network routing and WAN connectivity devicesNo patch-independent workaround available other than access controlMultiple vulnerability types (input validation, resource exhaustion, information disclosure)
Exploitability
Moderate exploit probability (EPSS 1.3%)
Affected products (24)
24 with fix
ProductAffected VersionsFix Status
RUGGEDCOM RM1224 LTE(4G) EU<V8.18.1
RUGGEDCOM RM1224 LTE(4G) NAM<V8.18.1
SCALANCE M804PB<V8.18.1
SCALANCE M812-1 ADSL-Router family<V8.18.1
SCALANCE M816-1 ADSL-Router family<V8.18.1
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to device management interfaces using firewall rules; allow only authorized engineering workstations and administrative systems
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate all affected SCALANCE M-800 and RUGGEDCOM devices to firmware version 8.1 or later
Long-term hardening
0/2
HARDENINGImplement network segmentation to isolate WAN routers and cellular gateways from business networks and the internet
HARDENINGRequire VPN with multi-factor authentication for any remote access to device management interfaces
View full CISA ICS-CERT advisory
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