All shell files must have mode 0755 or less permissive.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-63713r1_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

If /etc/shells exists, check the group ownership of each shell referenced. # cat /etc/shells | xargs -n1 ls -l Otherwise, check any shells found on the system. # find / -name "*sh" | xargs -n1 ls -l If a shell has a mode more permissive than 0755, this is a finding.

Fix text

Change the mode of the shell. # chmod 0755

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