flask@0.8 vulnerabilities

A simple framework for building complex web applications.

Direct Vulnerabilities

Known vulnerabilities in the flask package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • H
Information Exposure

Affected versions of this package are vulnerable to Information Exposure in the form of exposing the permanent session cookie, when all of the following conditions are met:

  1. The application is hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.

  2. The application sets session.permanent = True.

  3. The application does not access or modify the session at any point during a request.

  4. SESSION_REFRESH_EACH_REQUEST is enabled (the default).

  5. The application does not set a Cache-Control header to indicate that a page is private or should not be cached.

A response containing data intended for one client may be cached and sent to other clients. If the proxy also caches Set-Cookie headers, it may send one client's session cookie to other clients. Under these conditions, the Vary: Cookie header is not set when a session is refreshed (re-sent to update the expiration) without being accessed or modified.

How to fix Information Exposure?

Upgrade flask to version 2.2.5, 2.3.2 or higher.

[,2.2.5) [2.3.0,2.3.2)
  • H
Denial of Service (DoS)

Flask is a lightweight WSGI web application framework

Affected versions of this package are vulnerable to Denial of Service (DoS). The package allows for unsafe encoded JSON data to be decoded.

How to fix Denial of Service (DoS)?

Upgrade Flask to version 0.12.3 or higher.

  • H
Improper Input Validation

flask is a lightweight WSGI web application framework.

Affected versions of this package are vulnerable to Improper Input Validation. It did not detect the encoding of incoming JSON data as one of the supported UTF encodings, and allowed arbitrary encodings from the request.

How to fix Improper Input Validation?

Upgrade flask to version 0.12.3 or higher.