STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The system must use a FIPS 140-2-approved cryptographic hashing algorithm for generating account password hashes (system-auth).

DISA Rule

SV-208837r603263_rule

Vulnerability Number

V-208837

Group Title

SRG-OS-000120

Rule Version

OL6-00-000062

Severity

CAT II

CCI(s)

• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

10

Fix Recommendation

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.

Check Contents

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.

Vulnerability Number

V-208837

Documentable

False

Rule Version

OL6-00-000062

Severity Override Guidance

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.

Check Content Reference

M

Target Key

2928

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