CVE-2023-6568

Reflected XSS via unsanitized Content-Type header in mlflow repository.

• CVSS 6.1
• CWE-79
• Input Validation and Sanitization
• Remote

A reflected Cross-Site Scripting (XSS) vulnerability exists in the mlflow/mlflow repository, specifically within the handling of the Content-Type header in POST requests. An attacker can inject malicious JavaScript code into the Content-Type header, which is then improperly reflected back to the user without adequate sanitization or escaping, leading to arbitrary JavaScript execution in the context of the victim's browser. The vulnerability is present in the mlflow/server/auth/__init__.py file, where the user-supplied Content-Type header is directly injected into a Python formatted string and returned to the user, facilitating the XSS attack.

CVE

CVE-2023-6568

CWE

CWE-79

CVSS base score

6.1

Published

2023-12-07

OWASP

A03 Injection

Orthogonal defect classification

Checking

Code defect classification

Incorrect Check

Category

Input Validation and Sanitization

Subcategory

Cross-Site Scripting (XSS)

Accessibility scope

Remote

Impact

Arbitrary Code Execution

Affected component

mlflow

Fixed by upgrading

Yes

Solution

Sanitize and escape the Content-Type header input before reflecting it back to the user. Upgrade to the latest version of mlflow where this issue is fixed.

from flask import Flask, request

app = Flask(__name__)

@app.route('/post', methods=['POST'])
def handle_post():
    content_type = request.headers.get('Content-Type', '')
    return f"Content-Type received: {content_type}"

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

from flask import Flask, request, escape

app = Flask(__name__)

@app.route('/post', methods=['POST'])
def handle_post():
    content_type = request.headers.get('Content-Type', '')
    escaped_content_type = escape(content_type)
    return f"Content-Type received: {escaped_content_type}"

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

<script>alert('XSS Vulnerability Exploited!');</script>

@misc{vaitp:cve20236568,
  title        = {{Reflected XSS via unsanitized Content-Type header in mlflow repository.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2023},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2023-6568},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2023-6568/}}
}