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so in the last video we talked about how to identify and exploit a command injection vulnerability but those kinds of attacks are becoming rare and rarer the industry is kind of wised up to how dangerous it is to have user-controlled values in a format string that gets past the system so we have to have other avenues of attack in order to achieve arbitrary code execution so in this video were going to talk about how to identify and exploit a buffer overflow so there are a number of functions in the C standard Library which if used incorrectly can lead to vulnerabilities things like stir copy or mem copy s printf stuff like that just anytime when youre copying information from a source to a destination and the amount of information in the source exceeds the amount of space that you have in the destination this can lead to something called a buffer overflow so were going to cut straight to the chase here and home in on this function that gets called by apply CGI just like the the fun