Check: GEN005120
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE:
GEN005120
(in versions v1 r14 through v1 r10)
Title
The TFTP daemon must be configured to vendor specifications, including a dedicated TFTP user account, a non-login shell, such as /bin/false, and a home directory owned by the TFTP user. (Cat II impact)
Discussion
If TFTP has a valid shell, it increases the likelihood of someone logging to the TFTP account and compromising the system.
Check Content
Check the /etc/passwd file to determine if TFTP is configured properly. Procedure: # grep tftp /etc/passwd If a TFTP user account does not exist and TFTP is active, this is a finding. Check the user shell for the TFTP user. If it is not /bin/false or equivalent, this is a finding. Check the home directory assigned to the TFTP user. If no home directory is set, or the directory specified is not dedicated to the use of the TFTP service, this is a finding.
Fix Text
Create a TFTP user account if none exists. Assign a non-login shell to the TFTP user account, such as /bin/false. Assign a home directory to the TFTP user account.
Additional Identifiers
Rule ID: SV-849r2_rule
Vulnerability ID: V-849
Group Title: GEN005120
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 |