| Name | CVE-2019-16254 |
| Description | Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DLA-2007-1, DLA-2027-1, DSA-4586-1, DSA-4587-1 |
| NVD severity | medium |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| jruby (PTS) | jessie | 1.5.6-9 | vulnerable |
| jessie (security) | 1.5.6-9+deb8u2 | fixed | |
| stretch (security), stretch | 1.7.26-1+deb9u1 | vulnerable | |
| buster, bullseye, sid | 9.1.17.0-3 | vulnerable | |
| ruby2.1 (PTS) | jessie | 2.1.5-2+deb8u3 | vulnerable |
| jessie (security) | 2.1.5-2+deb8u9 | fixed | |
| ruby2.3 (PTS) | stretch (security), stretch | 2.3.3-1+deb9u7 | fixed |
| ruby2.5 (PTS) | buster, buster (security) | 2.5.5-3+deb10u1 | fixed |
| bullseye, sid | 2.5.7-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| jruby | source | (unstable) | (unfixed) | |||
| jruby | source | jessie | 1.5.6-9+deb8u2 | DLA-2027-1 | ||
| ruby2.1 | source | (unstable) | (unfixed) | |||
| ruby2.1 | source | jessie | 2.1.5-2+deb8u8 | DLA-2007-1 | ||
| ruby2.3 | source | (unstable) | (unfixed) | |||
| ruby2.3 | source | stretch | 2.3.3-1+deb9u7 | DSA-4587-1 | ||
| ruby2.5 | source | (unstable) | 2.5.7-1 | |||
| ruby2.5 | source | buster | 2.5.5-3+deb10u1 | DSA-4586-1 |
https://github.com/ruby/ruby/commit/3ce238b5f9795581eb84114dcfbdf4aa086bfecc
https://hackerone.com/reports/331984
https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/