An update for python-flask is now available for openEuler-20.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2023-1936 Final 1.0 1.0 2023-12-22 Initial 2023-12-22 2023-12-22 openEuler SA Tool V1.0 2023-12-22 python-flask security update An update for python-flask is now available for openEuler-20.03-LTS-SP4. Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and has become one of the most popular Python web application frameworks. Security Fix(es): 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. 1. The application must be 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` 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. 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) An update for python-flask is now available for openEuler-20.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High python-flask https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1936 https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2023-30861 https://nvd.nist.gov/vuln/detail/CVE-2023-30861 openEuler-20.03-LTS-SP4 python2-flask-1.1.2-5.oe2003sp4.noarch.rpm python3-flask-1.1.2-5.oe2003sp4.noarch.rpm python-flask-1.1.2-5.oe2003sp4.src.rpm 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.1. The application must be 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` 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.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. 2023-12-22 CVE-2023-30861 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N python-flask security update 2023-12-22 https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1936