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Siemens TIM 1531 IRC

Act Now9.8ICS-CERT ICSA-18-088-02Mar 27, 2018
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

The Siemens TIM 1531 IRC (Teleservice Input Module) is a redundancy and communication module used in industrial automation networks. A CWE-303 improper authentication vulnerability in all versions prior to V1.1 allows an unauthenticated attacker on the network to gain full control of the device without valid credentials. This affects TIM 1531 IRC modules and SIPLUS NET variants.

What this means
What could happen
An unauthenticated attacker on the network could take full control of the TIM 1531 IRC device, which could disrupt communications between automation systems and lead to production stoppages or unsafe states in connected industrial processes.
Who's at risk
Organizations operating Siemens TIM 1531 IRC redundancy and communication modules in industrial automation environments, including SIPLUS NET variants. These are typically found in manufacturing plants, water treatment facilities, and power generation systems where Siemens automation networks require reliable communication between distant control nodes.
How it could be exploited
An attacker sends a crafted network request to the TIM 1531 IRC device (port and protocol determined by the CWE-303 improper authentication flaw). The device fails to properly validate the request, allowing the attacker to execute arbitrary code or commands with no credentials required.
Prerequisites
  • Network access to the TIM 1531 IRC device (reachable from attacker's network or compromised network segment)
  • No authentication credentials needed
Remotely exploitableNo authentication requiredLow complexity attackCritical severity (CVSS 9.8)Affects industrial communication infrastructureHigh potential for process disruption
Exploitability
Moderate exploit probability (EPSS 3.5%)
Affected products (1)
ProductAffected VersionsFix Status
TIM 1531 IRC (incl. SIPLUS NET variants): All<V1.1V1.1
Remediation & Mitigation
0/3
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate TIM 1531 IRC firmware to version V1.1 or later
Long-term hardening
0/2
HARDENINGIsolate TIM 1531 IRC devices on a dedicated industrial network segment with firewall rules restricting access to only authorized engineering workstations and control systems
HARDENINGImplement network segmentation to prevent direct access from corporate or untrusted networks to the TIM 1531 IRC
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