Possible Open Redirect Vulnerability
aydinnyunus opened this issue · comments
Summary:
The code contains a potential open redirect vulnerability when redirecting users based on the next_url
parameter.
Vulnerability Description:
The next_url
parameter, used for redirecting authenticated users, can be manipulated by attackers to redirect users to malicious websites outside the application's control. This poses a risk of phishing attacks or redirection to harmful content.
Location:
File:
Line 396 in 900fb09
Recommendation:
-
Sanitize Input: Validate the
next_url
parameter to ensure it only redirects to trusted and whitelisted domains within the application's control. -
Encode URLs: Use URL encoding to prevent injection attacks and ensure that the redirect URL is properly formatted and secure.
-
Implement a Whitelist: Restrict redirection to a predefined list of safe URLs or paths within the application.
Example Fix:
# Before redirecting, validate and sanitize the next_url parameter
if 'next_url' in state:
next_url = state.get('next_url')
# Validate next_url to ensure it redirects only to trusted domains
if is_safe_url(next_url):
self.redirect(next_url)
else:
# Redirect to a default safe URL if next_url is not safe
self.redirect('/default_safe_url')
else:
# Redirect to a default URL if next_url is not provided
self.redirect('/default_url')