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Check: GEN002230 M6

MACOSX 10.6: GEN002230 M6 (in version v1 r3)

Title

All shell files must not have extended ACLs. (Cat II impact)

Discussion

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

Check Content

Open a terminal session and enter the following command to view extended ACLs. cat /etc/shells | xargs -n1 ls -lL If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text

Open a terminal session and use the following command to remove the extended ACLs. chmod -N <shell file with extended ACL>

Additional Identifiers

Rule ID: SV-38098r1_rule

Vulnerability ID: V-22366

Group Title:

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

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

Number	Title
AC-6	Least Privilege