+Valid Accounts Mitigation

Valid Accounts Mitigation

Take measures to detect or prevent techniques such as OS Credential Dumping or installation of keyloggers to acquire credentials through Input Capture. Limit credential overlap across systems to prevent access if account credentials are obtained. Ensure that local administrator accounts have complex, unique passwords across all systems on the network. Do not put user or admin domain accounts in the local administrator groups across systems unless they are tightly controlled and use of accounts is segmented, as this is often equivalent to having a local administrator account with the same password on all systems.

Follow best practices for design and administration of an enterprise network to limit privileged account use across administrative tiers.[1]

Audit domain and local accounts as well as their permission levels routinely to look for situations that could allow an adversary to gain wide access by obtaining credentials of a privileged account.[2],[3] These audits should also include if default accounts have been enabled, or if new local accounts are created that have not be authorized.

Applications and appliances that utilize default username and password should be changed immediately after the installation, and before deployment to a production environment.[4] When possible, applications that use SSH keys should be updated periodically and properly secured.

References

  1. Plett, C., Poggemeyer, L. (12, October 26). Securing Privileged Access Reference Material. Retrieved April 25, 2017.
  2. Microsoft. (2016, April 15). Attractive Accounts for Credential Theft. Retrieved June 3, 2016.
  3. Microsoft. (2016, April 16). Implementing Least-Privilege Administrative Models. Retrieved June 3, 2016.
  4. US-CERT. (n.d.). Risks of Default Passwords on the Internet. Retrieved April 12, 2019.

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