Adversaries may attempt to access detailed information about the password policy used within an enterprise network or cloud environment. Password policies are a way to enforce complex passwords that are difficult to guess or crack through Brute Force. This information may help the adversary to create a list of common passwords and launch dictionary and/or brute force attacks which adheres to the policy (e.g. if the minimum password length should be 8, then not trying passwords such as 'pass123'; not checking for more than 3-4 passwords per account if the lockout is set to 6 as to not lock out accounts).

Password policies can be set and discovered on Windows, Linux, and macOS systems via various command shell utilities such as net accounts (/domain), Get-ADDefaultDomainPasswordPolicy, chage -l <username>, cat /etc/pam.d/common-password, and pwpolicy getaccountpolicies^[1],[2]. Adversaries may also leverage a Network Device CLI on network devices to discover password policy information (e.g. show aaa, show aaa common-criteria policy all).^[3]

Password policies can be discovered in cloud environments using available APIs such as GetAccountPasswordPolicy in AWS^[4].

References

1. Matutiae, M. (2014, August 6). How to display password policy information for a user (Ubuntu)?. Retrieved April 5, 2018.
2. Holland, J. (2016, January 25). User password policies on non AD machines. Retrieved April 5, 2018.
3. US-CERT. (2018, April 20). Alert (TA18-106A) Russian State-Sponsored Cyber Actors Targeting Network Infrastructure Devices. Retrieved October 19, 2020.
4. Amazon Web Services. (n.d.). AWS API GetAccountPasswordPolicy. Retrieved June 8, 2021.

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