TryHackMe: Brainpan 1 (OSCP Preparation for buffer overflow to RCE)

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It's recommend to try out brainpan from tryhackme before you guys go for your OSCP exam. This machine will helps alot in learning how to perform buffer overflow and execute the shellcode in stack to perform RCE.
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I didn't get how x00 is confirmed as bad character. Because if he include /x00 in shellcode, it show up in memory dump. can you explain this part

nmkkannan
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can you recommend some vulnerable apps for bufferoverflow practice before I sign up for OSCP labs?

nmkkannan
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why did you try !/bin/bash after (press RETURN) message ?? I would never think about that !!

luisqp