CVE-2023-23934

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.

• How can I get the fixes?
• What do statuses mean?

References

• MITRE
• NVD
• Launchpad
• Debian

Related Ubuntu Security Notices (USN)

• USN-5948-1
• Werkzeug vulnerabilities
• 13 March 2023
• USN-5948-2
• Werkzeug vulnerabilities
• 20 June 2023

Other 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.cve.org/CVERecord?id=CVE-2023-23934