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.
Signed-off-by: Narpat Mali <narpat.mali@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
