Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass
CVE-2023-23934

2.6LOW

Key Information:

Vendor

Pallets

Status
Werkzeug
Vendor
CVE Published:
14 February 2023

What is 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.

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Affected Version(s)

werkzeug < 2.2.3

References

https://github.com/pallets/werkzeug/security/advisories/G...
x_refsource_CONFIRM
https://github.com/pallets/werkzeug/commit/cf275f42acad1b...
x_refsource_MISC
https://github.com/pallets/werkzeug/releases/tag/2.2.3
x_refsource_MISC

CVSS V3.1

Score:
2.6
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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