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Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches Set-Cookie headers, it may send one client's session cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met.
The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.
The application sets session.permanent = True
The application does not access or modify the session at any point during a request.
SESSION_REFRESH_EACH_REQUEST enabled (the default).
The application does not set a Cache-Control header to indicate that a page is private or should not be cached.
This happens because vulnerable versions of Flask only set the Vary: Cookie header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.
CVE-2023-30861 - High Severity Vulnerability
A simple framework for building complex web applications.
Library home page: https://files.pythonhosted.org/packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
Path to dependency file: /requirements.txt
Path to vulnerable library: /requirements.txt
Dependency Hierarchy:
Found in base branch: master
Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches
Set-Cookie
headers, it may send one client'ssession
cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met.session.permanent = True
SESSION_REFRESH_EACH_REQUEST
enabled (the default).Cache-Control
header to indicate that a page is private or should not be cached.This happens because vulnerable versions of Flask only set the
Vary: Cookie
header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.Publish Date: 2023-05-02
URL: CVE-2023-30861
Base Score Metrics:
Type: Upgrade version
Origin: https://www.cve.org/CVERecord?id=CVE-2023-30861
Release Date: 2023-05-02
Fix Resolution: 2.2.5
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