7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
57.1%
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.
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.
github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b
github.com/pallets/flask/commit/afd63b16170b7c047f5758eb910c416511e9c965
github.com/pallets/flask/releases/tag/2.2.5
github.com/pallets/flask/releases/tag/2.3.2
github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq
lists.debian.org/debian-lts-announce/2023/08/msg00024.html
security.netapp.com/advisory/ntap-20230818-0006/
www.debian.org/security/2023/dsa-5442
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
57.1%