Connection reset by peer? (Tested on Exchange 2013, Server 2008)

[anonuser78]

I am having the problem on Windows

File "privexchange.py", line 221, in
main()
File "privexchange.py", line 140, in main
session.request("POST", ews_url, POST_BODY % (args.exchange_version, attacker_url), headers)
File "/usr/lib/python2.7/httplib.py", line 1042, in request
self._send_request(method, url, body, headers)
File "/usr/lib/python2.7/httplib.py", line 1082, in _send_request
self.endheaders(body)
File "/usr/lib/python2.7/httplib.py", line 1038, in endheaders
self._send_output(message_body)
File "/usr/lib/python2.7/httplib.py", line 882, in _send_output
self.send(msg)
File "/usr/lib/python2.7/httplib.py", line 844, in send
self.connect()
File "/usr/lib/python2.7/httplib.py", line 1263, in connect
server_hostname=server_hostname)
File "/usr/lib/python2.7/ssl.py", line 369, in wrap_socket
_context=self)
File "/usr/lib/python2.7/ssl.py", line 617, in init
self.do_handshake()
File "/usr/lib/python2.7/ssl.py", line 846, in do_handshake
self._sslobj.do_handshake()
socket.error: [Errno 104] Connection reset by peer

Any thoughts?

[alghammariosmah]

I am having the same issue as I am testing on my local network from Ubuntu OS, did you solve it somehow?

[dirkjanm]

This seems to be SSL related and I can't really investigate this since I'm not in your environment.
It might be useful to see what openssl mentions when it connects to the same port with s_client:
openssl s_client -connect exchangeserver.local:443

[alghammariosmah]

I guess there were some broken packets with openssl in my current linux Kernel. So, what I did is just reinstall openssl using 'apt-get install --reinstall openssl' and it worked somehow.
Thanks for your quick response @dirkjanm

[anonuser78]

that's what I've got :

CONNECTED(00000003)
write:errno=104

no peer certificate available

No client certificate CA names sent

SSL handshake has read 0 bytes and written 313 bytes
Verification: OK

New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)

Reinstalling openssl didn't solve the problem*

Is firewall blocking it?

[alghammariosmah]

@anonuser78 I don't which operating system you're using, but for me, I am using Ubuntu. I installed another Ubuntu in a Vrtualbox and somehow it works there, while it didn't work on my physical host Ubuntu. I thought it could be due to Openssl dependencies or maybe binaries. So that's why I reinstalled Openssl on my machine. It somehow worked

[anonuser78]

@alghammariosmah I run it on a Kali Linux VM

[erkanaksoy]

I have had the same problem and fixed it by changing the following first line and adding the second and the third ones.

uv_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
uv_context.verify_mode = ssl.CERT_NONE
uv_context.check_hostname = False

Credit goes to https://twitter.com/den_n1s/status/1091502994351374337

[anonuser78]

I have had the same problem and fixed it by changing the following first line and adding the second and the third ones.

uv_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
uv_context.verify_mode = ssl.CERT_NONE
uv_context.check_hostname = False

Credit goes to https://twitter.com/den_n1s/status/1091502994351374337

Can you, please, show me where/how to change it? Thank you!

[bu9brains]

Tried as mentioned by @erkanaksoy and @alghammariosmah but still facing below error. Could you please help to resolve this?

#openssl s_client -connect xxxxx.xxx.xxxx:443

CONNECTED(00000003)
write:errno=104

no peer certificate available

No client certificate CA names sent

SSL handshake has read 0 bytes and written 311 bytes
Verification: OK

New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)