CVE-2023-30861
Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
At a glance
- Source
- NVD
- EPSS
- EPSS 1.25 % · percentile 69 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
References
- https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq
- https://github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b
- https://github.com/pallets/flask/commit/afd63b16170b7c047f5758eb910c416511e9c965
- https://github.com/pallets/flask/releases/tag/2.2.5
- https://github.com/pallets/flask/releases/tag/2.3.2
- https://www.debian.org/security/2023/dsa-5442
- https://security.netapp.com/advisory/ntap-20230818-0006/
- https://lists.debian.org/debian-lts-announce/2023/08/msg00024.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-m2qf-hxjv-5gpq — Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
- PYSEC-2023-62 — 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 c
European references
- ENISA EUVD · EUVD-2023-0080
- GCVE · GCVE-0-2023-30861
CERT-FR advisories
- CERTFR-2025-AVI-0546 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0903 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0366 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2023-AVI-0484 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:palletsprojects:flask:*:*:*:*:*:*:*:*< 2.2.5cpe:2.3:a:palletsprojects:flask:*:*:*:*:*:*:*:*≥ 2.3.0 < 2.3.2
Affected products
| Product | Versions |
|---|---|
| pallets · flask | affected >= 2.3.0, < 2.3.2 ; affected < 2.2.5 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |