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T1059.008 Network Device CLI

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.

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.2

Item Value
ID T1059.008
Sub-techniques T1059.001, T1059.002, T1059.003, T1059.004, T1059.005, T1059.006, T1059.007, T1059.008, T1059.009
Tactics TA0002
Platforms Network
Version 1.1
Created 20 October 2020
Last Modified 19 April 2022

Mitigations

ID Mitigation Description
M1038 Execution Prevention TACACS+ can keep control over which commands administrators are permitted to use through the configuration of authentication and command authorization. 4
M1026 Privileged Account Management Use of Authentication, Authorization, and Accounting (AAA) systems will limit actions administrators can perform and provide a history of user actions to detect unauthorized use and abuse. TACACS+ can keep control over which commands administrators are permitted to use through the configuration of authentication and command authorization3 4
M1018 User Account Management Use of Authentication, Authorization, and Accounting (AAA) systems will limit actions users can perform and provide a history of user actions to detect unauthorized use and abuse. Ensure least privilege principles are applied to user accounts and groups so that only authorized users can perform configuration changes. 3

Detection

ID Data Source Data Component
DS0017 Command Command Execution

References

  1. Cisco. (n.d.). Cisco IOS Software Integrity Assurance - Command History. Retrieved October 21, 2020. ↩

  2. Graham Holmes. (2015, October 8). Evolution of attacks on Cisco IOS devices. Retrieved October 19, 2020. ↩

  3. Cisco. (n.d.). Cisco IOS Software Integrity Assurance - AAA. Retrieved October 19, 2020. ↩↩

  4. Cisco. (n.d.). Cisco IOS Software Integrity Assurance - TACACS. Retrieved October 19, 2020. ↩↩