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Check: GEN001800

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN001800 (in versions v1 r14 through v1 r10)

Title

All skeleton files (typically those in /etc/skel) must have mode 0644 or less permissive. (Cat II impact)

Discussion

If the skeleton files are not protected, unauthorized personnel could change user startup parameters and possibly jeopardize user files.

Check Content

Check skeleton files permissions. Procedure: # ls -l /etc/security/.profile If a skeleton file has a mode more permissive than 0644, this is a finding. Check the mkuser.sys file. The /etc/security/mkuser.sys is a script containing items used in creation of users' ~/.profile files. This script needs to be both protected from unauthorized modification, but also needs to be executable, therefore the permissions need to be at the mode of 755. #ls -l /etc/security/mkuser.sys If the mkuser.sys file has a mode more permissive than 0755, this is a finding.

Fix Text

Change the mode of skeleton files with incorrect mode. # chmod 0644 /etc/security/.profile #chmod 0755 /etc/security/mkuser.sys

Additional Identifiers

Rule ID: SV-38735r1_rule

Vulnerability ID: V-788

Group Title: GEN001800

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000225	Employ the principle of least privilege, allowing only authorized accesses for users (or processes acting on behalf of users) which are necessary to accomplish assigned organizational tasks.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-6	Least Privilege