striptls - proxy de auditoria

implementação poc de ataques de remoção de STARTTLS

Uma implementação de proxy tcp genérica e ferramenta de auditoria para realizar interceptação ssl/tls independente de protocolo e ataques de remoção de STARTTLS em SMTP, POP3, IMAP, FTP, NNTP, XMPP, ACAP e IRC.

Python2!

🏆 Troféus

• CVE-2016-0772 - python: smtplib
• CVE-2016-10027 - biblioteca Smack XMPP

_{//Descobriu uma vulnerabilidade com a ajuda deste projeto? Envie-me uma mensagem!}

Requer:

• Python >= 2.7.9 (SSLContext) < Python 3
• (opcional para interceptação tls) Certificado e PrivateKey no formato PEM (arquivo único) --key=server.pem

Vetores

• GENERIC
• Intercept - interceptação ssl/tls independente de protocolo. verifica o handshake TLS, converte o socket para tls (proxy tls-para-tls)
• InboundIntercept - interceptação ssl/tls independente de protocolo apenas para o canal de entrada (proxy tls-para-plain)
• SMTP
• SMTP.StripFromCapabilities - patch de capacidade de resposta do servidor
• SMTP.StripWithInvalidResponseCode - remoção de STARTTLS do cliente, código de resposta inválido
• SMTP.UntrustedIntercept - interceptação STARTTLS (cliente e servidor falando ssl) (requer server.pem no diretório atual)
• SMTP.StripWithTemporaryError
• SMTP.StripWithError
• SMTP.ProtocolDowngradeStripExtendedMode
• SMTP.InjectCommand
• SMTP.InboundStarttlsProxy - (proxy starttls-para-plain)
• POP3
• POP3.StripFromCapabilities
• POP3.StripWithError
• POP3.UntrustedIntercept
• IMAP
• IMAP.StripFromCapabilities
• IMAP.StripWithError
• IMAP.UntrustedIntercept
• IMAP.ProtocolDowngradeToV2
• FTP
• FTP.StripFromCapabilities
• FTP.StripWithError
• FTP.UntrustedIntercept
• NNTP
• NNTP.StripFromCapabilities
• NNTP.StripWithError
• NNTP.UntrustedIntercept
• XMPP
• XMPP.StripFromCapabilities
• XMPP.StripInboundTLS
• XMPP.UntrustedIntercept
• ACAP (não testado)
• ACAP.StripFromCapabilities
• ACAP.StripWithError
• ACAP.UntrustedIntercept
• IRC
• IRC.StripFromCapabilities
• IRC.StripWithError
• IRC.UntrustedIntercept
• IRC.StripWithNotRegistered
• IRC.StripCAPWithNotregistered
• IRC.StripWithSilentDrop

Resultados:```python

• [*] client: 127.0.0.1

• [Vulnerable!] <class striptls.StripWithInvalidResponseCode at 0xffd3138c>
  

• [Vulnerable!] <class striptls.StripWithTemporaryError at 0xffd4611c>
  

• [           ] <class striptls.StripFromCapabilities at 0xffd316bc>
  

• [Vulnerable!] <class striptls.StripWithError at 0xffd4614c>
  

• [*] client: 192.168.139.1

• [Vulnerable!] <class striptls.StripInboundTLS at 0x7f08319a6808>
  

• [Vulnerable!] <class striptls.StripFromCapabilities at 0x7f08319a67a0>
  

• [Vulnerable!] <class striptls.UntrustedIntercept at 0x7f08319a6870>
  

## Uso```
#> python2 -m pip install striptls
#> python2 -m striptls --help

-``` #> python -m striptls --help # from pip/setup.py #> python striptls --help # from source / root folder Usage: striptls.py [options]

   example: striptls.py --listen 0.0.0.0:25 --remote mail.server.tld:25

Options: -h, --help show this help message and exit -q, --quiet be quiet [default: True] -l LISTEN, --listen=LISTEN listen ip:port [default: 0.0.0.0:<remote_port>] -r REMOTE, --remote=REMOTE remote target ip:port to forward sessions to -k KEY, --key=KEY SSL Certificate and Private key file to use, PEM format assumed [default: server.pem] -s, --generic-ssl-intercept dynamically intercept SSL/TLS -b BUFFER_SIZE, --bufsiz=BUFFER_SIZE -x VECTORS, --vectors=VECTORS Comma separated list of vectors. Use 'ALL' (default) to select all vectors, 'NONE' for tcp/ssl proxy mode. Available vectors: ACAP.StripFromCapabilities, ACAP.StripWithError, ACAP.UntrustedIntercept, FTP.StripFromCapabilities, FTP.StripWithError, FTP.UntrustedIntercept, GENERIC.Intercept, IMAP.ProtocolDowngradeToV2, IMAP.StripFromCapabilities, IMAP.StripWithError, IMAP.UntrustedIntercept, IRC.StripCAPWithNotRegistered, IRC.StripFromCapabilities, IRC.StripWithError, IRC.StripWithNotRegistered, IRC.StripWithSilentDrop, IRC.UntrustedIntercept, NNTP.StripFromCapabilities, NNTP.StripWithError, NNTP.UntrustedIntercept, POP3.StripFromCapabilities, POP3.StripWithError, POP3.UntrustedIntercept, SMTP.InboundStarttlsProxy, SMTP.InjectCommand, SMTP.ProtocolDowngradeStripExtendedMode, SMTP.StripFromCapabilities, SMTP.StripWithError, SMTP.StripWithInvalidResponseCode, SMTP.StripWithTemporaryError, SMTP.UntrustedIntercept, XMPP.StripFromCapabilities, XMPP.StripInboundTLS, XMPP.UntrustedIntercept [default: ALL]

## Instalação (opcional)

do pip

    #> pip install striptls

a partir do código fonte

    #> setup.py install

## Exemplos

	                  inbound                    outbound
	[inbound_peer]<------------->[listen:proxy]<------------->[outbound_peer/target]
	  smtp-client                   striptls                    remote/target
	  
local `smtp-client` -> `localhost:8825` (proxy) -> `mail.gmx.net:25`

### Interceptação SSL/TLS Genérica

`--generic-ssl-intercept` é uma chave global para ativar a deteção genérica de handshake SSL/TLS e conversão de sessão. Pode ser combinado com qualquer mangle/vector.

`GENERIC.Intercept` é uma implementação mangle/vector da funcionalidade de deteção e conversão de handshake SSL/TLS.