CVE-2023-30861
Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
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.
A flaw was found in the Python Flask package. A cached response may contain data for one client sent by a proxy to other clients, including session cookies, resulting in the compromise of data confidentiality contained in the leak requests or cookies. This happens when the following conditions are met by the proxy's behavior regarding cookies and the application's behavior session usage:
1. The caching proxy does not strip or ignore response with cookies
2. The application sets a permanent session
3. The application does not access or modify the session during requests
4. SESSION_REFRESH_EACH_REQUEST is enabled, which is the default Flask behavior
5. The application does not set the Cache-Control header to avoid being cached
CVSS Scores
SSVC
- Decision:-
Timeline
- 2023-04-18 CVE Reserved
- 2023-05-02 CVE Published
- 2023-10-13 First Exploit
- 2024-08-02 CVE Updated
- 2024-11-22 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-488: Exposure of Data Element to Wrong Session
- CWE-539: Use of Persistent Cookies Containing Sensitive Information
CAPEC
References (11)
| URL | Date | SRC |
|---|---|---|
| https://github.com/JawadPy/CVE-2023-30861-Exploit | 2023-10-13 |
| URL | Date | SRC |
|---|---|---|
| https://github.com/pallets/flask/commit/70f906c51ce49c485f1d355703e9cc3386b1cc2b | 2023-08-20 | |
| https://github.com/pallets/flask/commit/afd63b16170b7c047f5758eb910c416511e9c965 | 2023-08-20 |
| URL | Date | SRC |
|---|---|---|
| https://github.com/pallets/flask/security/advisories/GHSA-m2qf-hxjv-5gpq | 2023-08-20 | |
| https://access.redhat.com/security/cve/CVE-2023-30861 | 2023-11-30 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2196643 | 2023-11-30 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Palletsprojects Search vendor "Palletsprojects" | Flask Search vendor "Palletsprojects" for product "Flask" | < 2.2.5 Search vendor "Palletsprojects" for product "Flask" and version " < 2.2.5" | - |
Affected
| ||||||
| Palletsprojects Search vendor "Palletsprojects" | Flask Search vendor "Palletsprojects" for product "Flask" | >= 2.3.0 < 2.3.2 Search vendor "Palletsprojects" for product "Flask" and version " >= 2.3.0 < 2.3.2" | - |
Affected
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