CVE-2024-8374

Code injection vulnerability in Cura's 3MF file handling allows arbitrary code execution.

• CVSS 7.8
• CWE-94
• Input Validation and Sanitization
• Remote

UltiMaker Cura slicer versions 5.7.0-beta.1 through 5.7.2 are vulnerable to code injection via the 3MF format reader (/plugins/ThreeMFReader.py). The vulnerability arises from improper handling of the drop_to_buildplate property within 3MF files, which are ZIP archives containing the model data. When a 3MF file is loaded in Cura, the value of the drop_to_buildplate property is passed to the Python eval() function without proper sanitization, allowing an attacker to execute arbitrary code by crafting a malicious 3MF file. This vulnerability poses a significant risk as 3MF files are commonly shared via 3D model databases.

CVE

CVE-2024-8374

CWE

CWE-94

CVSS base score

7.8

Published

2024-09-03

OWASP

A01 Broken Access Control

Orthogonal defect classification

Algorithm

Code defect classification

Incorrect Functionality

Category

Input Validation and Sanitization

Subcategory

Command Injection

Accessibility scope

Remote

Impact

Arbitrary Code Execution

Affected component

Python

Solution

Upgrade to UltiMaker Cura version 5.7.3 or later, which includes a patch for this vulnerability.

import zipfile
import xml.etree.ElementTree as ET

def read_3mf(file_path):
    """Vulnerable function that demonstrates the security issue."""
    with zipfile.ZipFile(file_path, 'r') as z:
        with z.open('3D/3DModel.model') as model_file:
            tree = ET.parse(model_file)
            root = tree.getroot()
            drop_to_buildplate = root.find('.//drop_to_buildplate').text
            
            eval_value = eval(drop_to_buildplate)
            print("Drop to buildplate value:", eval_value)

import zipfile
import xml.etree.ElementTree as ET
import ast

def read_3mf(file_path):
    """Secure function that fixes the vulnerability."""
    # SECURE: This version prevents command injection
    with zipfile.ZipFile(file_path, 'r') as z:
        with z.open('3D/3DModel.model') as model_file:
            tree = ET.parse(model_file)
            root = tree.getroot()
            drop_to_buildplate = root.find('.//drop_to_buildplate').text
            
            eval_value = ast.literal_eval(drop_to_buildplate)
            print("Drop to buildplate value:", eval_value)

__import__('os').system('echo vulnerable > /tmp/vulnerable.txt')

@misc{vaitp:cve20248374,
  title        = {{Code injection vulnerability in Cura's 3MF file handling allows arbitrary code execution.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-8374},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-8374/}}
}