Patch

CVE-2024-37891

with vRx

Vulnerability Overview

CVE Name

CVE-2024-37891

Severity

4.4

Low

CVE Description

urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib...

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

Date

Script

Script Type

Remediation script

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What does the Remediation Script do? Version Check and Update: The script first checks if the current version of urllib3 is safe and updates it to version 1.26.19 or 2.2.2 if needed. Safe HTTP Requests: If using a proxy, the script utilizes ProxyManager to safely manage the Proxy-Authorization header. If not using a proxy, the script removes the Proxy-Authorization header to avoid accidental leaks and disables HTTP redirects (redirects=False). Automation: This script automates the process of ensuring urllib3's safety in your environment. By running this script, you ensure safe usage of urllib3 and the Proxy-Authorization header across HTTP requests.

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import urllib3
import subprocess
from urllib3.util.retry import Retry

def update_urllib3():
    """
    Check urllib3 version and upgrade to a safe version if necessary.
    """
    current_version = urllib3.__version__
    print(f"Current urllib3 version: {current_version}")

# Check if the version is less than 1.26.19 or 2.2.2, then upgrade
    if current_version < "1.26.19" or current_version < "2.2.2":
        print("Updating urllib3 to a safe version...")
        subprocess.run(["pip", "install", "--upgrade", "urllib3"])
        print("urllib3 has been updated.")
    else:
        print("No need to update, the version is safe.")

def safe_request(url, headers=None, use_proxy=False, proxy_url=None):
    """
    Make HTTP requests safely, ensuring that Proxy-Authorization header is handled properly.
    
    Parameters:
    - url (str): The target URL.
    - headers (dict): Request headers, including Proxy-Authorization if needed.
    - use_proxy (bool): Whether or not to use a proxy.
    - proxy_url (str): Proxy URL if using a proxy.
    """
    if use_proxy and proxy_url:
        # Use ProxyManager for safe proxy handling
        print(f"Using proxy: {proxy_url}")
        proxy = urllib3.ProxyManager(proxy_url, proxy_headers=headers)
        response = proxy.request("GET", url)
    else:
        # Ensure safe handling of Proxy-Authorization header without proxy
        if headers and "Proxy-Authorization" in headers:
            print("Warning: Proxy-Authorization header found without proxy support. Removing header for safety.")
            headers.pop("Proxy-Authorization")
        
        # Disable automatic redirects using the Retry object
        retry_policy = Retry(redirect=False)
        http = urllib3.PoolManager(retries=retry_policy)
        response = http.request("GET", url, headers=headers)

# Print response status
    print(f"Response status: {response.status}")
    return response

# Step 1: Update urllib3 to a safe version
update_urllib3()

# Step 2: Make safe requests with or without proxy
# Example without proxy (remove Proxy-Authorization if present)
headers = {"Proxy-Authorization": "Basic dXNlcjpwYXNzd29yZA=="}
url = "http://example.com"

# If using a proxy:
use_proxy = False  # Change to True if using a proxy
proxy_url = "http://your-proxy-url"

# Make the request
response = safe_request(url, headers=headers, use_proxy=use_proxy, proxy_url=proxy_url)

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Affected OS & Apps

No items found.

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