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Schneider Electric Telvent SAGE RTU DNP3 Improper Input Validation Vulnerability

Low RiskICS-CERT ICSA-14-006-01Oct 9, 2014
Summary

Telvent SAGE 3030 remote terminal units contain an improper input validation vulnerability in DNP3 message handling. Affected versions include all SAGE 3030 models prior to December 1, 2013, including firmware variants C3413-500-001D3_P4 and C3413-500-001F0_PB. The vulnerability allows unauthenticated attackers to send malformed DNP3 packets that the RTU does not properly validate, potentially causing the device to crash or malfunction. No patch is available from the vendor.

What this means
What could happen
An attacker could send specially crafted DNP3 messages to cause the SAGE RTU to crash or behave unpredictably, disrupting remote terminal operations and potentially affecting energy grid visibility and control.
Who's at risk
Energy utilities operating Schneider Electric Telvent SAGE 3030 remote terminal units, particularly those used for substation monitoring and control in distribution and transmission systems.
How it could be exploited
An attacker with network access to the DNP3 communication port (typically port 20000 or configured alternative) can send malformed input that the RTU fails to validate properly, triggering a crash or denial of service.
Prerequisites
  • Network access to DNP3 port on the SAGE RTU (default or configured)
  • No authentication required to send DNP3 messages
Remotely exploitableNo authentication requiredNo patch availableAffects critical SCADA/RTU equipment
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (3)
3 EOL
ProductAffected VersionsFix Status
Telvent SAGE 3030: C3413-500-001D3_P4C3413-500-001D3 P4No fix (EOL)
Telvent SAGE 3030: C3413-500-001F0_PBC3413-500-001F0 PBNo fix (EOL)
Telvent SAGE 3030 remote terminal unit (RTU): <December_1_2013<December 1 2013No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/1
Telvent SAGE 3030 remote terminal unit (RTU): <December_1_2013
WORKAROUNDRestrict network access to the SAGE RTU DNP3 port using firewall rules; only allow DNP3 traffic from authorized master stations and SCADA systems
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

Telvent SAGE 3030 remote terminal unit (RTU): <December_1_2013
HARDENINGMonitor RTU logs for abnormal DNP3 messages or unexpected restarts as an indicator of attempted exploitation
Mitigations - no patch available
0/2
The following products have reached End of Life with no planned fix: Telvent SAGE 3030: C3413-500-001D3_P4, Telvent SAGE 3030: C3413-500-001F0_PB, Telvent SAGE 3030 remote terminal unit (RTU): <December_1_2013. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate the RTU on a dedicated control network with access controls between corporate and operational networks
HARDENINGContact Schneider Electric for guidance on end-of-life SAGE 3030 units and consider migration to supported firmware or replacement hardware
View full CISA ICS-CERT advisory
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