A long, long time ago, in a land free of binary exploit mitigations, when Unix still roamed the Earth, there lived a pre-authentication Telnetd vulnerability.
In fact, this vulnerability was born so long ago (way back in 1994) that it may even be older than you. To put the timespan in perspective: it came into existence the same year the seminal movie Hackers was released.
That was so long ago that RISC was still a distant dream.
Come to think of it, maybe it was even the product of Zero Cool himself?
Anyway. Recently, this vulnerability was brutally put to rest.
What Are We Looking At Here?
If you’re not familiar with Telnet, that’s okay.
Telnet is a network protocol that provides a command-line interface for communicating with a remote server over TCP/IP. In other…