Format String Exploit Troubleshooting Over Twitter - bin 0x11 b

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Shared February 25, 2021

Helping somebody with a simple format string exploit via twitter. Getting stuck with problems is one of the most frustrating but best ways to learn. That's why I like to help people figure out their own issues, rather than just telling them.

https://exploit.education/protostar/

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00:00​ Intro
00:59​ Question via Twitter DM
02:16​ My Initial Thoughts and Analysis
03:20​ Format String Recap
04:30​ Analyzing The Broken Script
05:39​ "Where is the flag?" What is the challenge goal?
06:20​ Question 1: What does %s do?
07:16​ Question 2: What is the difference between %x and %s?
08:07​ GO WATCH MY OLD VIDEOS!
08:28​ Question 3: Does %s print strings from the stack?
09:09​ Binary Exploitation Episode 0x1E & Google Solutions
10:45​ Question 4 Going Back to Basics!
12:05​ Question 5: How to print actual stack values?
13:05​ Miscommunication via Text Messages
13:45​ Wrong Challenge Assumptions
14:33​ Miscommunication Again
15:35​ Testing %x
15:56​ Recognizing ASCII in hexdump
17:10​ Typical Format String Exploit Issues
17:59​ Running Into More Weird Bugs
20:23​ Debugging The Script
21:45​ Almost Solved It!
22:45​ Found the Flag!
23:20​ Ooops! They Had Solved It Earlier
23:34​ Conclusion: Helping People Takes Time
24:15​ Is This a Good Video?
24:39​ Outro

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