All shell files must have mode 0755 or less permissive.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38846r1_rule All shell files must have mode 0755 or less permissive.

Vulnerability discussion

Shells with world/group write permissions give the ability to maliciously modify the shell to obtain unauthorized access.

Check content

Obtain a list of system shells from /etc/security/login.cfg and check the permissions of these shells. Procedure: #grep shells /etc/security/login.cfg | grep -v \* | cut -f 2 -d = | sed s/,/\ /g | xargs -n1 ls -l If any shell has a mode more permissive than 0755, this is a finding. Obtain a list of system shells from /etc/shells and check the ownership of these shells. Procedure: #cat /etc/shells | xargs -n1 ls -l If any shell has a mode more permissive than 0755, this is a finding.

Fix text

Change the mode of the shell. # chmod 0755 < shell >

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