CVE-2023-30861

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Source

https://nvd.nist.gov/vuln/detail/CVE-2023-30861

Import Source

https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-30861.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2023-30861

Aliases

Related

Published

2023-05-02T18:15:52Z

Modified

2024-10-12T10:53:46.055567Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

[none]

Details

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.

References

Affected packages

Debian:11 / flask

Package

Name: flask
Purl: pkg:deb/debian/flask?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.1.2-2+deb11u1

Affected versions

1.*

1.1.2-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / flask

Package

Name: flask
Purl: pkg:deb/debian/flask?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.2.2-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / flask

Package

Name: flask
Purl: pkg:deb/debian/flask?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.2.2-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Git / github.com/pallets/flask

Affected ranges

Type: GIT
Repo: https://github.com/pallets/flask
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

70f906c51ce49c485f1d355703e9cc3386b1cc2b

Fixed

afd63b16170b7c047f5758eb910c416511e9c965

Affected versions

0.*

0.1

0.10

0.10.1

0.11

0.11.1

0.12

0.12.1

0.12.2

0.12.3

0.12.4

0.12.5

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.8.1

0.9

1.*

1.0

1.0.1

1.0.2

1.0.3

1.0.4

1.1.0

1.1.1

1.1.2

1.1.3

1.1.4

2.*

2.0.0

2.0.0rc1

2.0.0rc2

2.0.1

2.0.2

2.0.3

2.1.0

2.1.1

2.1.2

2.1.3

2.2.0

2.2.1

2.2.2

2.2.3

2.2.4

2.3.0

2.3.1