Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass
Summary
Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2023-23934 python-werkzeug Fixed in: 1.0.1+dfsg1-2+deb11u1
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- advisory security.netapp.com
- advisory debian.org
- patch github.com
- web github.com