TypeError: can't concat str to bytes on Python 3.9.7, latest impacket, clean Miniconda docker environment

[my-other-github-account]

Hello,

I am having an issue with the Relevant CTF (https://tryhackme.com/room/relevant) using AutoBlue. I see some walkthroughs using it successfully - so the command should work.

As requested, I have filed this as a new issue, as this indeed does occur in latest impacket, latest Python, in a clean Miniconda docker environment (as well as on my host, Kali Linux 2021.1).

The following steps will reproduce this issue:

docker run -i -t continuumio/miniconda3 /bin/bash
conda create -n py397 python=3.9.7
conda activate py397
pip install git+https://github.com/SecureAuthCorp/impacket
git clone https://github.com/3ndG4me/AutoBlue-MS17-010.git
cd AutoBlue-MS17-010
python3 zzz_exploit.py 'RELEVANT/Bill:[email protected]'

Yielding the following results:

[*] Target OS: Windows Server 2016 Standard Evaluation 14393
[-] Could not open /usr/share/metasploit-framework/data/wordlists/named_pipes.txt, trying hardcoded values
[+] Found pipe 'netlogon'
[+] Using named pipe: netlogon
Traceback (most recent call last):
  File "/AutoBlue-MS17-010/zzz_exploit.py", line 1112, in <module>
    main()
  File "/AutoBlue-MS17-010/zzz_exploit.py", line 1109, in main
    exploit(options.target_ip, int(options.port), username, password, options.pipe, options.share, options.mode)
  File "/AutoBlue-MS17-010/zzz_exploit.py", line 980, in exploit
    if not info['method'](conn, pipe_name, info):
  File "/AutoBlue-MS17-010/zzz_exploit.py", line 469, in exploit_matched_pairs
    info.update(leak_frag_size(conn, tid, fid))
  File "/AutoBlue-MS17-010/zzz_exploit.py", line 313, in leak_frag_size
    req1 = conn.create_nt_trans_packet(5, param=pack('<HH', fid, 0), mid=mid, data='A'*0x10d0, maxParameterCount=GROOM_TRANS_SIZE-0x10d0-TRANS_NAME_LEN)
  File "/AutoBlue-MS17-010/mysmb.py", line 375, in create_nt_trans_packet
    _put_trans_data(transCmd, param, data, noPad)
  File "/AutoBlue-MS17-010/mysmb.py", line 83, in _put_trans_data
    transData += (b'\x00' * padLen) + data
TypeError: can't concat str to bytes

Thank you for your time.

[A1vinSmith]

I'm on Python 3.9.9. Same problem.

Tried to fix it, no luck.

transData = "".join(map(chr,(b'\x00' * padLen))) + str(parameters)

transData += "".join(map(chr,(b'\x00' * padLen))) + str(data)

# req = str(pkt)
req = pkt.getData()
return b'\x00'*2 + pack('>H', len(req)) + req  # assume length is <6553

[A1vinSmith]

You can't use the mysmb.py outside the repo. ZZZ works for me now

[r-erd]

Can you please elaborate on how you managed to get it working? Facing the same issue. But I am executing the python code from the directory that contains the mysmb.py.

Edit: somehow it just suddenly worked, I am not aware of having changed anything

[A1vinSmith]

managed

I just used the zzz.py it worked. If it ask some dependencies, pip3 install them. If still not working, google the error and download some scripts to replace those not workings.

[3ndG4me]

Closing this as it seems to just be a dependency issue case by case. If anyone would like to contribute a resolution I am open to cleaning up issues that cause dependency workflow problems, but personally I never encounter these problems, and if I do it's usually a quick fix like @A1vinSmith suggested.

Feel free to open a new issue or a PR with a contribution in the future if desired!