Check: GEN002220
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
If /etc/shells exists, check the group ownership of each shell referenced. # cat /etc/shells | xargs -n1 ls -lL If a 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:
Vulnerability ID: V-922
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 |