CVE-2023-25577

Name	CVE-2023-25577
Description	Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Version 2.2.3 contains a patch for this issue.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3346-1, DSA-5470-1, ELA-897-1
Debian Bugs	1031370

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-werkzeug (PTS)	jessie, jessie (lts)	0.9.6+dfsg-1+deb8u3	fixed
	stretch (lts), stretch	0.11.15+dfsg1-1+deb9u2	fixed
	buster (security), buster, buster (lts)	0.14.1+dfsg1-4+deb10u2	fixed
	bullseye (security), bullseye	1.0.1+dfsg1-2+deb11u1	fixed
	bookworm	2.2.2-3	fixed
	sid, trixie	3.0.4-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
python-werkzeug	source	jessie	0.9.6+dfsg-1+deb8u3	ELA-897-1
python-werkzeug	source	stretch	0.11.15+dfsg1-1+deb9u2	ELA-897-1
python-werkzeug	source	buster	0.14.1+dfsg1-4+deb10u2	DLA-3346-1
python-werkzeug	source	bullseye	1.0.1+dfsg1-2+deb11u1	DSA-5470-1
python-werkzeug	source	(unstable)	2.2.2-3		1031370

Notes

https://github.com/pallets/werkzeug/commit/fe899d0cdf767a7289a8bf746b7f72c2907a1b4b (2.2.3)
https://github.com/pallets/werkzeug/commit/09449ee77934a0c883f5959785864ecae6aaa2c9 (2.2.3)
https://github.com/pallets/werkzeug/commit/babc8d9e8c9fa995ef26050698bc9b5a92803664 (2.2.3)
https://github.com/pallets/werkzeug/security/advisories/GHSA-xg9f-g7g7-2323