CVE-2024-45601

Vulnerability in Mesop allows unauthorized file access due to input validation issues.

• CVSS 7.5
• CWE-20
• Input Validation and Sanitization
• Remote

Mesop is a Python-based UI framework designed for rapid web apps development. A vulnerability has been discovered and fixed in Mesop that could potentially allow unauthorized access to files on the server hosting the Mesop application. The vulnerability was related to insufficient input validation in a specific endpoint. This could have allowed an attacker to access files not intended to be served. Users are strongly advised to update to the latest version of Mesop immediately. The latest version includes a fix for this vulnerability. At time of publication 0.12.4 is the most recently available version of Mesop.

CVE

CVE-2024-45601

CWE

CWE-20

CVSS base score

7.5

Published

2024-09-18

OWASP

A01 Broken Access Control

Orthogonal defect classification

Checking

Code defect classification

Missing Check

Category

Input Validation and Sanitization

Subcategory

Insecure Direct Object References (IDOR)

Accessibility scope

Remote

Impact

Unauthorized Access

Affected component

Mesop

Fixed by upgrading

Yes

Solution

Upgrade to version 0.12.4 or later.

from flask import Flask, send_from_directory

app = Flask(__name__)

@app.route('/files/<path:filename>', methods=['GET'])
def get_file(filename):
    return send_from_directory('.', filename)

if __name__ == '__main__':
    app.run()

from flask import Flask, request, abort, send_from_directory
import os

app = Flask(__name__)

SAFE_DIRECTORY = "/path/to/directory"

@app.route('/files/<path:filename>', methods=['GET'])
def get_file(filename):
    if '..' in filename or filename.startswith('/'):
        abort(403)

    return send_from_directory(SAFE_DIRECTORY, filename)

if __name__ == '__main__':
    app.run()

/files/../../etc/passwd

@misc{vaitp:cve202445601,
  title        = {{Vulnerability in Mesop allows unauthorized file access due to input validation issues.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-45601},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-45601/}}
}