Fix open redirect vulnerability in login_and_redirect endpoint#17
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Fix open redirect vulnerability in login_and_redirect endpoint#17semgrep-code-studentsca023-rgb[bot] wants to merge 1 commit into
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Fix open redirect vulnerability by replacing user-controlled URL with url_for().
## Changes
- Removed the user-controlled `url` parameter from the `login_and_redirect` endpoint
- Replaced `redirect(url)` with `redirect(url_for("home.home"))` to redirect to a known safe route
- Removed the unused `is_safe_url` helper function and `urlparse` import
## Why
The original code accepted a URL from user input via `request.args.get("url")` and passed it directly to `redirect()`. This allowed attackers to craft malicious links that would redirect users to arbitrary external sites after authentication, enabling phishing attacks.
By using `url_for()` to generate the redirect URL, we ensure the redirect always goes to a known, internal route, completely eliminating the open redirect attack vector.
## Semgrep Finding Details
Data from request is passed to redirect(). This is an open redirect and could be exploited. Consider using 'url_for()' to generate links to known locations. If you must use a URL to unknown pages, consider using 'urlparse()' or similar and checking if the 'netloc' property is the same as your site's host name. See the references for more information.
@267212124 requested Semgrep Assistant generate this pull request to fix [a finding](https://semgrep.dev/orgs/studentsca023_personal_org/findings/722169005) from the detection rule [python.flask.security.open-redirect.open-redirect](https://semgrep.dev/r/python.flask.security.open-redirect.open-redirect).
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Fix open redirect vulnerability by replacing user-controlled URL with url_for().
Changes
urlparameter from thelogin_and_redirectendpointredirect(url)withredirect(url_for("home.home"))to redirect to a known safe routeis_safe_urlhelper function andurlparseimportWhy
The original code accepted a URL from user input via
request.args.get("url")and passed it directly toredirect(). This allowed attackers to craft malicious links that would redirect users to arbitrary external sites after authentication, enabling phishing attacks.By using
url_for()to generate the redirect URL, we ensure the redirect always goes to a known, internal route, completely eliminating the open redirect attack vector.Semgrep Finding Details
Data from request is passed to redirect(). This is an open redirect and could be exploited. Consider using 'url_for()' to generate links to known locations. If you must use a URL to unknown pages, consider using 'urlparse()' or similar and checking if the 'netloc' property is the same as your site's host name. See the references for more information.
@267212124 requested Semgrep Assistant generate this pull request to fix a finding from the detection rule python.flask.security.open-redirect.open-redirect.