The Ubuntu operating system must employ a FIPS 140-2 approved cryptographic hashing algorithms for all stored passwords.

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

SV-90141r1_rule The Ubuntu operating system must employ a FIPS 140-2 approved cryptographic hashing algorithms for all stored passwords.

Vulnerability discussion

The system must use a strong hashing algorithm to store the password. The system must use a sufficient number of hashing rounds to ensure the required level of entropy.Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised.Satisfies: SRG-OS-000073-GPOS-00041, SRG-OS-000120-GPOS-00061

Check content

Verify the shadow password suite configuration is set to encrypt interactive user passwords using a strong cryptographic hash with the following command: Confirm that the interactive user account passwords are using a strong password hash with the following command: # sudo cut -d: -f2 /etc/shadow $6$kcOnRq/5$NUEYPuyL.wghQwWssXRcLRFiiru7f5JPV6GaJhNC2aK5F3PZpE/BCCtwrxRc/AInKMNX3CdMw11m9STiql12f/ Password hashes "!" or "*" indicate inactive accounts not available for logon and are not evaluated. If any interactive user password hash does not begin with "$6", this is a finding.

Fix text

Configure the Ubuntu operating system to encrypt all stored passwords with a strong cryptographic hash. Lock all interactive user accounts not using SHA-512 hashing until the passwords can be regenerated.

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