Fun prank: export LD_TRACE_LOADED_OBJECTS in your friend's .bashrc.
ELF binaries have an "interpreter", http://ld-linux.so , whose job I suppose it is to put everything in place, load dynamic libraries, ASLR, jmp _start. But how does it solve the regress?
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Could be very helpful if you need /bin/true, but don't have /bin/true.
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I think it's fair to say that if an attacker has access to your environment variables, it's game over. CGI's a dangerous design, shoulda used stdin.
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I wonder what happens if you can controller a setuid binary's interpreter.
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