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Siemens SINEC NMS

Plan Patch8.8ICS-CERT ICSA-21-257-14Sep 14, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary

Multiple vulnerabilities in SINEC NMS versions before 1.0 SP1 could allow an attacker to manipulate the system's configuration through social engineering. The most severe vulnerability enables an attacker to trick an authenticated administrator into clicking a malicious link, which can be used to perform unauthorized configuration changes without additional authorization (cross-site request forgery and path traversal). Affected versions are any SINEC NMS installation earlier than version 1.0 SP1.

What this means
What could happen
An attacker could modify SINEC NMS configuration settings through social engineering if an administrator clicks a malicious link, potentially allowing unauthorized changes to network management policies, monitoring rules, or system access controls.
Who's at risk
Network management operators and administrators in any industrial facility using Siemens SINEC NMS for managing Siemens network devices and monitoring. This includes water utilities, electric utilities, and manufacturing plants that use Siemens control system networking infrastructure.
How it could be exploited
The attacker sends a crafted malicious link to a SINEC NMS administrator via email or other communication channel. When the admin clicks the link while authenticated to SINEC NMS, the attacker can perform actions on behalf of the admin without additional authorization (cross-site request forgery). This allows configuration manipulation such as disabling monitoring, altering network policies, or creating unauthorized admin accounts.
Prerequisites
  • Administrator must be authenticated to SINEC NMS
  • Administrator must click on attacker-supplied malicious link
  • Administrator must be using a web browser to access SINEC NMS
Requires user interaction (admin must click link)Can alter network and system configurationAffects network management visibility and control
Exploitability
Moderate exploit probability (EPSS 2.3%)
Affected products (1)
ProductAffected VersionsFix Status
SINEC NMS<V1.0 SP11.0 SP1
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGTrain administrators not to click links from untrusted sources and implement email security controls to warn about external links
HARDENINGUse VPN or firewall rules to ensure SINEC NMS is not directly accessible from the Internet
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEC NMS to version 1.0 SP1 or later
Long-term hardening
0/1
HARDENINGImplement network segmentation to restrict SINEC NMS access to authorized engineering and operations staff only
View full CISA ICS-CERT advisory
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