Title

AIX must define default permissions for all authenticated users in such a way that the user can only read and modify their own files. (Cat II impact)

Discussion

Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary access.

Check Content

Check if "/etc/security/.profile" contains the proper "umask" setting by running the following command: # grep "umask 077" /etc/security/.profile umask 077 If the above command does not output the "umask 077", this is a finding. From the command prompt, run the following command to check if "umask=077" for the default stanza in "/etc/security/user": # lssec -f /etc/security/user -s default -a umask default umask=077 If the "umask" for the default stanza is not "077", or the "umask" is not set, this is a finding.

Fix Text

Add the following line to "/etc/security/.profile": umask 077 Run the following command to set "umask=077" for the default stanza in "/etc/security/user": # chsec -f /etc/security/user -s default -a umask=077

Additional Identifiers

Rule ID: SV-215431r991590_rule

Vulnerability ID: V-215431

Group Title: SRG-OS-000480-GPOS-00228

Expert Comments

CCIs tied to check.

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