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The TFTP daemon must operate in "secure mode" which provides access only to a single directory on the host file system.


Overview

Finding ID Version Rule ID IA Controls Severity
V-847 GEN005080 SV-28420r1_rule ECSC-1 High
Description
Secure mode limits TFTP requests to a specific directory. If TFTP is not running in secure mode, it may be able to write to any file or directory and may seriously impair system integrity, confidentiality, and availability.
STIG Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE 2018-09-18

Details

Check Text ( C-28685r2_chk )
If the system is not running tftp, this is not applicable.

Determine if tftpd is running in secure mode.

# more /etc/tftpaccess.ctl

If the file does not exist, this is a finding. If the file does not contain an entry restricting access to the tftp user home directory, this is a finding. If other configuration is in the file, this is a finding.
Fix Text (F-25711r1_fix)
Edit /etc/tftpaccess.ctl to only contain an entry restricting access to the tftp user home directory.