Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads. The CLI is the primary means through which users and administrators interact with the device in order to view system information, modify device operations, or perform diagnostic and administrative functions. CLIs typically contain various permission levels required for different commands. Scripting interpreters automate tasks and extend functionality beyond the command set included in the network OS. The CLI and scripting interpreter are accessible through a direct console connection, or through remote means, such as telnet or [SSH](https://attack.mitre.org/techniques/T1021/004). Adversaries can use the network CLI to change how network devices behave and operate. The CLI may be used to manipulate traffic flows to intercept or manipulate data, modify startup configuration parameters to load malicious system software, or to disable security features or logging to avoid detection.(Citation: Cisco Synful Knock Evolution)

Linked Issues

Issuelinks
Linktype Issue
is related to Techniques
is blocked by Execution Prevention
is blocked by Behavioral Detection of CLI Abuse on Network Devices
is blocked by Privileged Account Management
is blocked by User Account Management
is blocked by Access Restriction For Change
is blocked by Secure Baseline Configurations
is blocked by Continuous Monitoring
is blocked by Malicious Code Protection (Anti-Malware)
is blocked by Endpoint File Integrity Monitoring (FIM)
is blocked by Separation of Duties (SoD)
is blocked by Identification & Authentication for Organizational Users
is blocked by Identification & Authentication for Non-Organizational Users
is blocked by Account Management
is blocked by Access Enforcement
is blocked by Least Privilege
is blocked by Remote Access
is blocked by Memory Protection
is blocked by Input Data Validation
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