SUID file drops suid bit on append?

c_coder · 03-12-2004, 03:37 AM

Hi,

I have here a world writable suid file owned by root.
However it seems to drop the suid bit after I (an ordinary user on the system) try to append anything to it. (The ownership does not change... only the suid bit is gone).

I tried to append to this file:-

system$ rwsrwsrwx 1 root root 52 Mar 12 19:52 tempfile

it becomes:-

system$ -rwxrwxrwx 1 root root 52 Mar 12 19:52 tempfile

is there a cure?
Thanks

jtshaw · 03-12-2004, 07:59 AM

I have a feeling it does that because of the security implications. One could easily make any program suid to a user execute anything under that users permissions if that was allowed.