CVE-2024-32880

Authenticated user can upload malicious templates, leading to RCE.

• CVSS 7.2
• CWE-434
• Input Validation and Sanitization
• Remote

pyload is an open-source Download Manager written in pure Python. An authenticated user can change the download folder and upload a crafted template to the specified folder lead to remote code execution. There is no fix available at the time of publication.

CVE

CVE-2024-32880

CWE

CWE-434

CVSS base score

7.2

Published

2024-04-26

OWASP

A01 Injection

Orthogonal defect classification

Function

Code defect classification

Incorrect Functionality

Category

Input Validation and Sanitization

Subcategory

Path Traversal

Accessibility scope

Remote

Impact

Arbitrary Code Execution

Affected component

pyload

Solution

Upgrade to the latest version of pyload once a patch is released, and implement strict input validation and sanitization for uploaded templates.

import os

def upload_template(user, template_path, upload_folder):
    print(f"Uploading template from {template_path} to {upload_folder}")

upload_template('authenticated_user', 'template.py', '/some//directory')

import os
import re

def check_path(base, path):
    abs_base = os.path.abspath(base)
    abs_path = os.path.abspath(path)
    return os.path.commonpath([abs_base]) == os.path.commonpath([abs_base, abs_path])

def upload_template(user, template_path, upload_folder):
    if not check_path('/allowed/upload/directory', upload_folder):
        raise ValueError("Invalid upload directory")

    if not re.match(r'^[\w\-. ]+$', os.path.basename(template_path)):
        raise ValueError("Invalid template filename")

    print(f"Uploading template from {template_path} to {upload_folder}")

try:
    upload_template('authenticated_user', 'template.py', '/some//directory')
except ValueError as e:
    print(e)

# This is an example of a crafted template that could be uploaded to achieve remote code execution.

# payload.py
import os

def execute():
    os.system('echo Vulnerability exploited! > /tmp/exploit.txt')

execute()

@misc{vaitp:cve202432880,
  title        = {{Authenticated user can upload malicious templates, leading to RCE.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-32880},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-32880/}}
}