CVE-2021-41819

Name	CVE-2021-41819
Description	CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.
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-2853-1, DSA-5066-1, DSA-5067-1
Debian Bugs	1002995

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby2.7 (PTS)	bullseye	2.7.4-1+deb11u1	fixed
	bullseye (security)	2.7.4-1+deb11u3	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
ruby2.3	source	stretch	2.3.3-1+deb9u11	DLA-2853-1
ruby2.3	source	(unstable)	(unfixed)
ruby2.5	source	buster	2.5.5-3+deb10u4	DSA-5066-1
ruby2.5	source	(unstable)	(unfixed)
ruby2.7	source	bullseye	2.7.4-1+deb11u1	DSA-5067-1
ruby2.7	source	(unstable)	2.7.5-1
ruby3.0	source	(unstable)	3.0.3-1		1002995

Notes

Fixed in Ruby 3.0.3, 2.7.5, 2.6.9
https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/
Fixed by: https://github.com/ruby/cgi/commit/052eb3a828b0f99bca39cfd800f6c2b91307dbd5 (v0.3.1)