Thanks for your report!  tftpd actually only performs fs operations as
"nobody", and can only overwrite files if permissions allow it:

[pid 16820] setgroups(1, [65534])       = 0
[pid 16820] chroot(".")                 = 0
[pid 16820] setregid(65534, 65534)      = 0
[pid 16820] setreuid(65534, 65534)      = 0
[pid 16820] bind(0, {sa_family=AF_INET, sin_port=htons(0), 
sin_addr=inet_addr("127.0.0.1")}, 16) = 0


** Changed in: tftp-hpa (Ubuntu)
     Assignee: Martin Pitt => (unassigned)
       Status: Unconfirmed => Rejected

** Visibility changed to: Public

-- 
defaults as root user
https://launchpad.net/bugs/35394

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