Check: GEN002230
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
If /etc/shells exists, check the permissions of each shell referenced. # cat /etc/shells | xargs -n1 ls -D If any file has an extended ACL, this is a finding.
Fix Text
Remove the extended ACL from the file. # chmod A- [shell]
Additional Identifiers
Rule ID:
Vulnerability ID: V-22366
Group Title:
Expert Comments
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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 |