Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade Flask-Security-Too to version 5.3.3 or higher.
Affected versions of this package are vulnerable to Open Redirect via the the /login and /register routes, using the ?next parameter.
Note:
With Werkzeug >=2.1.0 the autocorrect_location_header configuration was changed to False - which means that location headers in redirects are relative by default. Thus, this issue may impact applications that were previously not impacted, if they are using Werkzeug >=2.1.0 as the WSGI layer.
Adding these configuration options to your app will mitigate all currently known examples:
app.config['SECURITY_REDIRECT_VALIDATE_MODE'] = "regex"
app.config['SECURITY_REDIRECT_VALIDATE_RE'] = r"^/{4,}|\\{3,}|[\s\000-\037][/\\]{2,}(?![/\\])|[/\\]([^/\\]|/[^/\\])*[/\\].*"
Note: The vulnerability present in this library and represented by CVE-2021-32618, was insufficiently assessed and a case was missed, leading to the current vulnerability. The fix commit from this advisory is strictly for this library.
https://example/login?next=/\github.com
https://example/login?next=\/github.com