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Siemens SINEC NMS

Plan Patch7.2ICS-CERT ICSA-21-222-04Aug 10, 2021
Attack VectorNetwork
Auth RequiredHigh
ComplexityLow
User InteractionNone needed
Summary

SINEC NMS contains a vulnerability that allows an authenticated remote attacker to execute arbitrary code with system privileges. The vulnerability is due to insufficient input validation in the management interface. Siemens has released version 1.0 SP2 that addresses this issue.

What this means
What could happen
An authenticated attacker could execute arbitrary code with system privileges on SINEC NMS, allowing them to compromise the network management system that monitors and controls Siemens industrial devices across your network.
Who's at risk
Network and systems engineers managing Siemens industrial devices via SINEC NMS in manufacturing plants, water utilities, and electrical substations should prioritize this fix. The vulnerability affects the centralized management platform for SCADA systems and distributed control systems across your facility.
How it could be exploited
An attacker with valid credentials to SINEC NMS could send a specially crafted request to the system to execute arbitrary commands. This allows them to take control of the network management platform, potentially disrupting visibility and control of connected industrial devices.
Prerequisites
  • Valid authentication credentials for SINEC NMS
  • Network access to SINEC NMS service port
  • SINEC NMS version earlier than 1.0 SP2
remotely exploitablerequires valid credentialsaffects network management/visibility systemlow attack complexity
Exploitability
Moderate exploit probability (EPSS 5.1%)
Affected products (1)
ProductAffected VersionsFix Status
SINEC NMS<V1.0 SP21.0 SP2
Remediation & Mitigation
0/4
Do now
0/1
HARDENINGRestrict network access to SINEC NMS using firewall rules; ensure the system is not accessible from the Internet or untrusted networks
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEC NMS to version 1.0 SP2 or later
HARDENINGReview and audit user accounts with SINEC NMS access; enforce strong password policies and consider disabling unnecessary accounts
Long-term hardening
0/1
HARDENINGIsolate SINEC NMS from business network; place on a dedicated management network segment with strict access controls
View full CISA ICS-CERT advisory
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