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worm design (Re: Level3 routing issues?)

  • From: E.B. Dreger
  • Date: Sat Jan 25 18:23:27 2003 
MS> Date: Sat, 25 Jan 2003 10:17:01 -0800 (PST)
MS> From: Marc Slemko


MS> It is interesting to note that one inadvertent advantage of open
MS> source (when it requires people to compile from source, and pick
MS> and choose options at compile time... popular distributions with
MS> precompiled packages obviously break this to a certain degree) is
MS> that it leads to a much more heterogenous set of software WRT
MS> attacks like buffer overflows.

1. Position-relative opcodes used in shellcode
2. Syscalls triggered via a software trap, not subroutine call
3. Dynamic linking involves fixups stored in the binary
4. Activate a syscall, then check the stack to find %eip


Eddy
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