| Name | CVE-2021-33621 |
| Description | The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object. |
| 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-3450-1 |
| Debian Bugs | 1024799, 1024800 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ruby2.5 (PTS) | buster | 2.5.5-3+deb10u4 | vulnerable |
| buster (security) | 2.5.5-3+deb10u6 | fixed |
| ruby2.7 (PTS) | bullseye (security), bullseye | 2.7.4-1+deb11u1 | vulnerable |
| ruby3.1 (PTS) | bookworm, sid, trixie | 3.1.2-7 | fixed |
The information below is based on the following data on fixed versions.
Notes
[bullseye] - ruby2.7 <no-dsa> (Minor issue)
https://www.ruby-lang.org/en/news/2022/11/22/http-response-splitting-in-cgi-cve-2021-33621/
Fixed by: https://github.com/ruby/cgi/commit/64c5045c0a6b84fdb938a8465a0890e5f7162708 (v0.3.4)
Possible followup needed: https://github.com/ruby/cgi/commit/b46d41c36380e04f6388970b5ef05c687f4d1819 (v0.3.5)
Fixed in Ruby 3.1.3, 3.0.5 and 2.2.7