STIGQter: STIG Summary: IBM AIX 7.x Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

AIX must only allow the use of DoD PKI-established certificate authorities for verification of the establishment of protected sessions.

DISA Rule

SV-215215r508663_rule

Vulnerability Number

V-215215

Group Title

SRG-OS-000403-GPOS-00182

Rule Version

AIX7-00-001105

Severity

CAT II

CCI(s)

• CCI-002470 - The information system only allows the use of organization-defined certificate authorities for verification of the establishment of protected sessions.

Weight

10

Fix Recommendation

Note: Depending on which version of GSKit is installed on AIX, the GSK commands that are used to manage the Key Database (KDB) have different names. The possible GSK commands are: gsk8capicmd (used below), gsk8capicmd_64 and gsk7cmd.

Create a key database with DoD PKI or DoD-approved certificate using one of the following commands:
# gsk8capicmd -keydb -create -db <KDB_FILE> -pw <KDB_PASSWORD> -type cms -stash

Edit "/etc/security/ldap/ldap.cfg" and add or edit the "ldapsslkeyf" setting to reference a KDB file containing a client certificate issued by DoD PKI or a DoD-approved external PKI.

Install a certificate signed by a DoD PKI or a DoD-approved external PKI using the following command:
# gsk8capicmd -cert -add -db <KDB_FILE> -pw <KDB_PASSWORD> -file <CERT_FILE> -label <CERT_LABEL>

Remove un-needed CA certificates using one of the following commands:
# gsk8capicmd -cert -delete -db <KDB_FILE> -pw <KDB_PASSWORD> -label <CERT_LABEL>

Restart LDAP client using command:
# /usr/sbin/restart-secldapclntd

Check Contents

Note: Depending on which version of GSKit is installed on AIX, the GSK commands that are used to manage the Key Database (KDB) have different names. The possible GSK commands are: gsk8capicmd (used below), gsk8capicmd_64 and gsk7cmd.

Check if the system is using LDAP authentication:

# grep LDAP /etc/security/user

If no lines are returned, this requirement is not applicable.

Check if the useSSL option is enabled:

# grep '^useSSL' /etc/security/ldap/ldap.cfg
useSSL:yes

If "yes" is not the returned value, this is a finding.

Verify a certificate is used for client authentication to the server:

# grep -i '^ldapsslkeyf' /etc/security/ldap/ldap.cfg
ldapsslkeyf:/tmp/key.kdb

If no line is found, this is a finding.

Identify the Key Database (KDB), and its password, by asking the ISSO/SA).

If no Key Database exists on the system, this is a finding.

List the certificate issuer with IBM GSK:

# gsk8capicmd -cert -list CA -db <KDB_FILE> -pw <KDB_PASSWORD>

Make note of the client Key Label:

# gsk8capicmd -cert -details -showOID -db <KDB_FILE> -pw <KDB_PASSWORD> -label <Key Label>

If the certificate is not issued by DoD PKI or a DoD-approved external PKI, this is a finding.

The IBM GSK Database should only have certificates for the client system and for the LDAP server.

If more certificates are in the key database than the LDAP server and the client, this is a finding.

Vulnerability Number

V-215215

Documentable

False

Rule Version

AIX7-00-001105

Severity Override Guidance

Note: Depending on which version of GSKit is installed on AIX, the GSK commands that are used to manage the Key Database (KDB) have different names. The possible GSK commands are: gsk8capicmd (used below), gsk8capicmd_64 and gsk7cmd.

Check if the system is using LDAP authentication:

# grep LDAP /etc/security/user

If no lines are returned, this requirement is not applicable.

Check if the useSSL option is enabled:

# grep '^useSSL' /etc/security/ldap/ldap.cfg
useSSL:yes

If "yes" is not the returned value, this is a finding.

Verify a certificate is used for client authentication to the server:

# grep -i '^ldapsslkeyf' /etc/security/ldap/ldap.cfg
ldapsslkeyf:/tmp/key.kdb

If no line is found, this is a finding.

Identify the Key Database (KDB), and its password, by asking the ISSO/SA).

If no Key Database exists on the system, this is a finding.

List the certificate issuer with IBM GSK:

# gsk8capicmd -cert -list CA -db <KDB_FILE> -pw <KDB_PASSWORD>

Make note of the client Key Label:

# gsk8capicmd -cert -details -showOID -db <KDB_FILE> -pw <KDB_PASSWORD> -label <Key Label>

If the certificate is not issued by DoD PKI or a DoD-approved external PKI, this is a finding.

The IBM GSK Database should only have certificates for the client system and for the LDAP server.

If more certificates are in the key database than the LDAP server and the client, this is a finding.

Check Content Reference

M

Target Key

4012

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