Arbitrary Code Execution Vulnerability in the Logback Component of SINEC NMS before V1.0.3
Monitor6.6SSA-371761Nov 8, 2022
Attack VectorNetwork
Auth RequiredHigh
ComplexityHigh
User InteractionNone needed
Summary
SINEC NMS versions before V1.0.3 contain a vulnerability in the logback component (CVE-2021-42550) that allows attackers with write access to the logback configuration file to execute arbitrary code on the system.
What this means
What could happen
An attacker with write access to the logback configuration file could execute arbitrary code on the SINEC NMS system, potentially allowing them to compromise the network management infrastructure that supervises your industrial control systems.
Who's at risk
Network managers and operators of SINEC NMS deployments that supervise industrial control systems, particularly in critical infrastructure sectors (water, electric utilities, oil & gas). The SINEC NMS system itself must be running a vulnerable version.
How it could be exploited
An attacker who has already gained write access to the logback configuration file (via compromised credentials, insecure file permissions, or prior system compromise) can inject malicious code into the logback configuration. When logback processes the configuration, the arbitrary code executes with the privileges of the SINEC NMS service.
Prerequisites
- Write access to the logback configuration file on the SINEC NMS system
- Knowledge of logback configuration syntax to inject malicious payloads
Requires high privilege level (credentials or prior system compromise)High complexity attack requiring knowledge of logback configurationAffects network management infrastructure for industrial systemsNo active exploitation reported
Exploitability
Moderate exploit probability (EPSS 2.7%)
Affected products (1)
ProductAffected VersionsFix Status
SINEC NMS< V1.0.31.0.3
Remediation & Mitigation
0/3
Do now
0/1HARDENINGAudit access logs to identify any unauthorized modifications to logback configuration files
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINEC NMS to version 1.0.3 or later
Long-term hardening
0/1HARDENINGReview and restrict file system permissions on logback configuration files to prevent unauthorized write access
CVEs (1)
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