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The Oracle Linux 6 Security Technical Implementation Guide (V2 R7) has 267 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.
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Inspect the "password" section of "/etc/pam.d/system-auth", "/etc/pam.d/system-auth-ac", "/etc/pam.d/password-auth", "/etc/pam.d/password-auth-ac", and other files in "/etc/pam.d" to identify the number of occurrences where the "pam_unix.so" module is used in the "password" section.
$ grep -E -c 'password.*pam_unix.so' /etc/pam.d/*
/etc/pam.d/atd:0
/etc/pam.d/config-util:0
/etc/pam.d/crond:0
/etc/pam.d/login:0
/etc/pam.d/other:0
/etc/pam.d/passwd:0
/etc/pam.d/password-auth:1
/etc/pam.d/password-auth-ac:1
/etc/pam.d/sshd:0
/etc/pam.d/su:0
/etc/pam.d/sudo:0
/etc/pam.d/system-auth:1
/etc/pam.d/system-auth-ac:1
/etc/pam.d/vlock:0
Note: The number adjacent to the file name indicates how many occurrences of the "pam_unix.so" module are found in the password section.
If the "pam_unix.so" module is not defined in the "password" section of "/etc/pam.d/system-auth", "/etc/pam.d/system-auth-ac", "/etc/pam.d/password-auth", and "/etc/pam.d/password-auth-ac" at a minimum, this is a finding.
Verify that the "sha512" variable is used with each instance of the "pam_unix.so" module in the "password" section:
$ grep password /etc/pam.d/* | grep pam_unix.so | grep sha512
/etc/pam.d/password-auth:password sufficient pam_unix.so sha512 [other arguments…]
/etc/pam.d/password-auth-ac:password sufficient pam_unix.so sha512 [other arguments…]
/etc/pam.d/system-auth:password sufficient pam_unix.so sha512 [other arguments…]
/etc/pam.d/system-auth-ac:password sufficient pam_unix.so sha512 [other arguments…]
If this list of files does not coincide with the previous command, this is a finding.
If any of the identified "pam_unix.so" modules do not use the "sha512" variable, this is a finding.
In "/etc/pam.d/system-auth", "/etc/pam.d/system-auth-ac", "/etc/pam.d/password-auth", and "/etc/pam.d/password-auth-ac", among potentially other files, the "password" section of the files control which PAM modules execute during a password change.
Set the "pam_unix.so" module in the "password" section to include the argument "sha512", as shown below:
password sufficient pam_unix.so sha512 [other arguments...]
This will help ensure when local users change their passwords, hashes for the new passwords will be generated using the SHA-512 algorithm. This is the default.
Note: Any updates made to "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" will be overwritten by the "authconfig" program. The "authconfig" program should not be used.