CVE-2025-23042

Gradio ACL bypass via case-sensitive file path check, allows access to protected files.

• CVSS 8.7
• CWE-285
• Input Validation and Sanitization
• Remote

Gradio is an open-source Python package that allows quick building of demos and web application for machine learning models, API, or any arbitrary Python function. Gradio's Access Control List (ACL) for file paths can be bypassed by altering the letter case of a blocked file or directory path. This vulnerability arises due to the lack of case normalization in the file path validation logic. On case-insensitive file systems, such as those used by Windows and macOS, this flaw enables attackers to circumvent security restrictions and access sensitive files that should be protected. This issue can lead to unauthorized data access, exposing sensitive information and undermining the integrity of Gradio's security model. Given Gradio's popularity for building web applications, particularly in machine learning and AI, this vulnerability may pose a substantial threat if exploited in production environments. This issue has been addressed in release version 5.6.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVE

CVE-2025-23042

CWE

CWE-285

CVSS base score

8.7

Published

2025-01-14

OWASP

A01 Broken Access Control

Orthogonal defect classification

Checking

Code defect classification

Incorrect Check

Category

Input Validation and Sanitization

Subcategory

Path Traversal

Accessibility scope

Remote

Impact

Information Disclosure

Affected component

Gradio

Fixed by upgrading

Yes

Solution

Upgrade to version 5.6.0.

import os

def is_path_allowed(filepath, allowed_paths):
  
  for allowed_path in allowed_paths:
      if filepath.startswith(allowed_path):
          return True
  return False

import os

def is_path_allowed(filepath, allowed_paths):
  
  normalized_filepath = os.path.normpath(filepath).lower()
  for allowed_path in allowed_paths:
    normalized_allowed_path = os.path.normpath(allowed_path).lower()
    if normalized_filepath.startswith(normalized_allowed_path):
      return True
  return False

`../../../SeCrEtFiLe.TxT`

@misc{vaitp:cve202523042,
  title        = {{Gradio ACL bypass via case-sensitive file path check, allows access to protected files.
}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2025},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2025-23042},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2025-23042/}}
}