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Check: GEN002230

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN002230 (in versions v1 r14 through v1 r10)

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

Check the permissions of each shell referenced in /etc/shells. Procedure: # cat /etc/shells For each shell listed, run aclget <shell path> #aclget <shell> Check the permissions of each shell referenced in /etc/security/login.cfg. Procedure: #grep shells /etc/security/login.cfg For each shell listed, run aclget <shell path> # aclget <shell> Otherwise, check any shells found on the system. # find / -name "*sh #aclget <directory>/<file> If extended permissions are enabled on any shell, this is a finding.

Fix Text

Remove the extended ACL from the shell file(s) and disable extended permissions. #acledit <directory>/<file>

Additional Identifiers

Rule ID: SV-38744r1_rule

Vulnerability ID: V-22366

Group Title: GEN002230

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