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Check: GEN002220

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN002220 (in versions v1 r14 through v1 r10)

Title

All shell files must have mode 0755 or less permissive. (Cat I impact)

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 >

Additional Identifiers

Rule ID: SV-38846r1_rule

Vulnerability ID: V-922

Group Title: GEN002220

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