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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
pallets werkzeug
< 2.2.3affected
References
- https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q ↗
- https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028 ↗
- https://github.com/pallets/werkzeug/releases/tag/2.2.3 ↗
- https://www.debian.org/security/2023/dsa-5470 ↗
- https://security.netapp.com/advisory/ntap-20230818-0003/ ↗