CVE-2023-23934
Description
Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.2.2-3 |
| sid | Fixed | 2.2.2-3 |
| forky | Fixed | 2.2.2-3 |
| bullseye | Fixed | 1.0.1+dfsg1-2+deb11u1 |
| bookworm | Fixed | 2.2.2-3 |
References
- https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q
- https://nvd.nist.gov/vuln/detail/CVE-2023-23934
- https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028
- https://github.com/pallets/werkzeug
- https://github.com/pallets/werkzeug/releases/tag/2.2.3
- https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-57.yaml
- https://security.netapp.com/advisory/ntap-20230818-0003
- https://www.debian.org/security/2023/dsa-5470
- https://www.suse.com/security/cve/CVE-2023-23934.html
- https://security-tracker.debian.org/tracker/CVE-2023-23934
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.