CVE-2023-23934

Published: 14 February 2023

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.

Priority

Cvss 3 Severity Score

3.5

Score breakdown

Status

Package	Release	Status
python-werkzeug Launchpad, Ubuntu, Debian	trusty	Ignored (end of standard support)
	upstream	Released (2.2.3)
	bionic	Released (0.14.1+dfsg1-1ubuntu0.2)
	focal	Released (0.16.1+dfsg1-2ubuntu0.1)
	jammy	Released (2.0.2+dfsg1-1ubuntu0.22.04.1)
	kinetic	Released (2.0.2+dfsg1-3ubuntu0.22.10.1)
	xenial	Released (0.10.4+dfsg1-1ubuntu1.2+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	lunar	Released (2.2.2-2ubuntu0.1)

Severity score breakdown

Parameter	Value
Base score	3.5
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References

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