Fixed improper exception handling of lsass dump parsing

[p0dalirius]

When lsassy sucessfully dumps the lsass but cannot parse it, the case was not handled properly and we get this traceback:

# cme smb 192.168.2.17 -d "LAB.local" -u Administrateur -H :902105c3a9fbc100e7f4227a811f30b5 -M lsassy -o METHOD=comsvcs_stealth --export lsassy_LAB.local
SMB         192.168.2.17    445    SRV2016         [*] Windows 10.0 Build 17763 x64 (name:SRV2016) (domain:LAB.local) (signing:False) (SMBv1:False)
SMB         192.168.2.17    445    SRV2016         [+] LAB.local\Administrateur::902105c3a9fbc100e7f4227a811f30b5 (admin)
Traceback (most recent call last):
  File "/root/.local/bin/crackmapexec", line 8, in <module>
192.168.2.17
[DEBUUUUG] 192.168.2.17 <lsassy.impacketfile.ImpacketFile object at 0x7f23a463e970>
    sys.exit(main())
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/crackmapexec.py", line 254, in main
    asyncio.run(
  File "/usr/lib/python3.9/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/crackmapexec.py", line 102, in start_threadpool
    await asyncio.gather(*jobs)
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/crackmapexec.py", line 68, in run_protocol
    await asyncio.wait_for(
  File "/usr/lib/python3.9/asyncio/tasks.py", line 442, in wait_for
    return await fut
  File "/usr/lib/python3.9/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/protocols/smb.py", line 125, in __init__
    connection.__init__(self, args, db, host)
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/connection.py", line 62, in __init__
    self.proto_flow()
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/connection.py", line 100, in proto_flow
    self.call_modules()
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/connection.py", line 132, in call_modules
    self.module.on_admin_login(context, self)
  File "/root/.local/pipx/venvs/crackmapexec/lib/python3.9/site-packages/cme/modules/lsassy_dump.py", line 66, in on_admin_login
    credentials, tickets = Parser(file).parse()
TypeError: cannot unpack non-iterable NoneType object

Fix

I added a condition to check if the parsing failed before using it:

https://github.com/p0dalirius/CrackMapExec/blob/f5ed47e630b524e1c8061c8ccbabfb1cfaa8ebb4/cme/modules/lsassy_dump.py#L65-L69

[mpgn]

Hello @p0dalirius can you check the conflict so I can merge the PR :)