CVE-2023-23934
Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`.
Does this matter?
Lower severity and a low EPSS score (0.51%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 3.5 LOWCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- palletsprojects/werkzeug
- Source
- security-advisories@github.com
References
- https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028Patch
- https://github.com/pallets/werkzeug/releases/tag/2.2.3Release Notes
- https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22qVendor Advisory
- https://security.netapp.com/advisory/ntap-20230818-0003/
- https://www.debian.org/security/2023/dsa-5470
- https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028Patch
- https://github.com/pallets/werkzeug/releases/tag/2.2.3Release Notes
- https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22qVendor Advisory
- https://security.netapp.com/advisory/ntap-20230818-0003/
- https://www.debian.org/security/2023/dsa-5470
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.