All shell files must not have extended ACLs.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-26492r1_rule All shell files must not have extended ACLs.

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 permissions of each shell referenced. # cat /etc/shells | xargs -n1 ls -lL Otherwise, check any shells found on the system. # find / -name "*sh" | xargs -n1 ls -lL If the permissions include a "+", the file has an extended ACL, this is a finding.

Fix text

Remove the extended ACL from the file. # chmod A- [shell]

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