Check: GEN004390
SUSE Linux Enterprise Server v11 for System z STIG:
GEN004390
(in versions v1 r12 through v1 r9)
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 e-mail.
Check Content
Check the permissions of the alias file. Procedure: for sendmail: # ls -lL /etc/aliases /etc/aliases.db If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding. for postfix: Verify the location of the alias file. # postconf alias_maps This will return the location of the "aliases" file. # ls -lL <postfix aliases file> <postfix aliases.db file> If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.
Fix Text
Remove the extended permissions from the alias files. Procedure: for sendmail: # setfacl --remove-all /etc/aliases /etc/aliases.db for postfix: # setfacl --remove-all <postfix aliases file> <postfix aliases.db file>
Additional Identifiers
Rule ID: SV-45850r1_rule
Vulnerability ID: V-22439
Group Title: GEN004390
Expert Comments
CCIs
| 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
| Number | Title |
|---|---|
| AC-6 |
Least Privilege |