CVE-2024-6844

Name	CVE-2024-6844
Description	A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1100988

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-flask-cors (PTS)	bullseye	3.0.9-2	vulnerable
	bookworm	3.0.10-2	vulnerable
	trixie	5.0.1-1	vulnerable
	sid	6.0.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-flask-cors	source	(unstable)	6.0.0-1			1100988

Notes

[bookworm] - python-flask-cors <postponed> (Minor issue, revisit when fixed upstream)
https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0
https://github.com/corydolphin/flask-cors/issues/385