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.
Remediation
References
Related Vulnerabilities
Jenkins CVE-2014-2060 Vulnerability (CVE-2014-2060)
Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2012-3394)
Apache 2.x version older than 2.0.61
WordPress 4.7.x Multiple Vulnerabilities (4.7 - 4.7.5)
WordPress Plugin Special Text Boxes Arbitrary File Upload (5.1.90)