Vulnerability Discussion

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.

Check

Verify the shadow password suite configuration is set to encrypt passwords with a FIPS 140-3 approved cryptographic hashing algorithm with the following command:

$ grep -i ENCRYPT_METHOD /etc/login.defs
ENCRYPT_METHOD SHA512

If "ENCRYPT_METHOD" does not equal SHA512 or greater, this is a finding.

Fix

Configure Ubuntu 24.04 LTS to encrypt all stored passwords.

Edit/modify the following line in the "/etc/login.defs" file and set "ENCRYPT_METHOD" to SHA512:

ENCRYPT_METHOD SHA512