Check: GEN004390
Title
The alias file must not have an extended ACL. (Cat II impact)
Discussion
Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect email.
Check Content
Check the permissions of the alias file and the hashed version of it used by sendmail. Procedure: # ls -D /etc/aliases If the file has an extended ACL, this is a finding.
Fix Text
Remove the extended ACL from the files. # chmod A- /etc/aliases
Additional Identifiers
Rule ID:
Vulnerability ID: V-22439
Group Title:
Expert Comments
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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 |