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Mary surprises Sherlock with her knowledge and insight into his character, but she had a very obvious vulnerability which Sherlock exploited it, although it was very painful for him!
Starting by checking the binary security with checksec:
$ checksec -f ./mary_morton
We have stack canary protection and non executable stack, if we analyse the binary with radare2 we can see it’s protected with a password, we can obtain this using radare2: