Schneider Electric Telvent RTU Improper Ethernet Frame Padding Vulnerability
Monitor5.3ICS-CERT ICSA-16-070-01Dec 12, 2016
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Schneider Electric Telvent RTU devices contain a vulnerability in Ethernet frame padding that allows information disclosure. Frames are not properly padded to the minimum Ethernet frame size, potentially exposing sensitive data in the padding bytes to network-accessible attackers. Affected models include Sage series (1410, 1430, 1450, 2300, 2400, 3030M) and LANDAC II-2 devices running specific firmware versions.
What this means
What could happen
An attacker on the network could extract sensitive information from Telvent RTU devices by reading data that leaks through improperly padded Ethernet frames. This could expose operational parameters, device configuration, or other telemetry data.
Who's at risk
Power utilities and energy operators using Schneider Electric Telvent RTU devices (Sage 1410, 1430, 1450, 2300, 2400, 3030M, and LANDAC II-2 models) for SCADA communications and remote telemetry. This affects critical infrastructure sites where these RTUs relay operational data and control information.
How it could be exploited
An attacker with network access to a Telvent RTU would capture Ethernet frames and examine the padding bytes. Improperly formatted frames may leak information about device memory or previous transmissions in the padding, which the attacker could then extract and analyze.
Prerequisites
- Network access to the Telvent RTU (either direct connection or access via network segment where the RTU operates
- No authentication required to capture and observe network traffic
- Ability to inspect raw Ethernet frames on the network
remotely exploitableno authentication requiredlow complexityno patch availableaffects energy sector critical infrastructure
Exploitability
Low exploit probability (EPSS 0.3%)
Affected products (7)
1 pending6 EOL
ProductAffected VersionsFix Status
Sage1430 firmware: <C3414-500-S02J2<C3414-500-S02J2No fix yet
Sage 3030M firmware: <C3414-500-S02J2<C3414-500-S02J2No fix (EOL)
Sage 1410 firmware: <C3414-500-S02J2<C3414-500-S02J2No fix (EOL)
Sage 1450 firmware: <C3414-500-S02J2<C3414-500-S02J2No fix (EOL)
LANDAC II-2 firmware: <C3414-500-S02J2<C3414-500-S02J2No fix (EOL)
Sage 2300 firmware: <C3413-500-S01<C3413-500-S01No fix (EOL)
Sage 2400 firmware: <C3414-500-S02J2<C3414-500-S02J2No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2WORKAROUNDRestrict network access to RTU devices using firewall rules; allow only authorized master stations and engineering workstations to communicate with RTUs
HARDENINGReview and document all devices and systems that communicate with affected RTU models to understand current network exposure
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGDeploy network monitoring and packet inspection tools on the RTU network segment to detect unusual traffic patterns
Mitigations - no patch available
0/1The following products have reached End of Life with no planned fix: Sage 3030M firmware: <C3414-500-S02J2, Sage 1410 firmware: <C3414-500-S02J2, Sage 1450 firmware: <C3414-500-S02J2, LANDAC II-2 firmware: <C3414-500-S02J2, Sage 2300 firmware: <C3413-500-S01, Sage 2400 firmware: <C3414-500-S02J2. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate Telvent RTU devices on a separate VLAN with restricted access
CVEs (1)
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