Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1weDhoLTZxeHYtbTIycc4AAxpo

Incorrect parsing of nameless cookies leads to __Host- cookies bypass

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 <= 2.2.2 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.

Permalink: https://github.com/advisories/GHSA-px8h-6qxv-m22q
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1weDhoLTZxeHYtbTIycc4AAxpo
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: 4 months ago
Updated: 3 months ago

CVSS Score: 2.6
CVSS vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Identifiers: GHSA-px8h-6qxv-m22q, CVE-2023-23934
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/releases/tag/2.2.3
• https://github.com/advisories/GHSA-px8h-6qxv-m22q

Affected Packages