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
7.4 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.6%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | flask | < 2.2.2-3 | flask_2.2.2-3_all.deb |
Debian | 11 | all | flask | < 1.1.2-2+deb11u1 | flask_1.1.2-2+deb11u1_all.deb |
Debian | 10 | all | flask | < 1.0.2-3+deb10u1 | flask_1.0.2-3+deb10u1_all.deb |
Debian | 999 | all | flask | < 2.2.2-3 | flask_2.2.2-3_all.deb |
Debian | 13 | all | flask | < 2.2.2-3 | flask_2.2.2-3_all.deb |
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
7.4 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.6%