CVE-2019-16254
First published: Fri Oct 25 2019(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/rh-ruby25-ruby | <0:2.5.9-9.el7 | 0:2.5.9-9.el7 |
| redhat/rh-ruby26-ruby | <0:2.6.7-119.el7 | 0:2.6.7-119.el7 |
| Ruby-lang Ruby | <=2.3.0 | |
| Ruby-lang Ruby | >=2.4.0<=2.4.7 | |
| Ruby-lang Ruby | >=2.5.0<=2.5.6 | |
| Ruby-lang Ruby | >=2.6.0<=2.6.4 | |
| Debian Debian Linux | =8.0 | |
| redhat/ruby | <2.4.8 | 2.4.8 |
| redhat/ruby | <2.5.7 | 2.5.7 |
| redhat/ruby | <2.6.5 | 2.6.5 |
| redhat/ruby | <2.7.0 | 2.7.0 |
| ubuntu/jruby | <1.5.6-9+ | 1.5.6-9+ |
| ubuntu/ruby2.3 | <2.3.1-2~ubuntu16.04.14 | 2.3.1-2~ubuntu16.04.14 |
| ubuntu/ruby2.5 | <2.5.1-1ubuntu1.6 | 2.5.1-1ubuntu1.6 |
| ubuntu/ruby2.5 | <2.5.5-1ubuntu1.1 | 2.5.5-1ubuntu1.1 |
| ubuntu/ruby2.5 | <2.5.5-4ubuntu2.1 | 2.5.5-4ubuntu2.1 |
| ubuntu/ruby2.5 | <2.5.7-1 | 2.5.7-1 |
| debian/jruby | 9.3.9.0+ds-8 9.4.8.0+ds-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-16254 https://nvd.nist.gov/vuln/detail/CVE-2019-16254
- https://bugzilla.redhat.com/show_bug.cgi?id=1789556
- https://access.redhat.com/errata/RHSA-2021:2587
- https://access.redhat.com/errata/RHSA-2021:2588
- https://access.redhat.com/errata/RHSA-2022:0581
- https://access.redhat.com/errata/RHSA-2022:0582
- https://access.redhat.com/errata/RHSA-2021:2104
- https://access.redhat.com/errata/RHSA-2021:2230
- https://access.redhat.com/security/cve/cve-2019-16254
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
- https://hackerone.com/reports/331984
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.html
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- https://seclists.org/bugtraq/2019/Dec/31
- https://seclists.org/bugtraq/2019/Dec/32
- https://security.gentoo.org/glsa/202003-06
- https://www.debian.org/security/2019/dsa-4586
- https://www.debian.org/security/2019/dsa-4587
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/
- https://launchpad.net/bugs/cve/CVE-2019-16254
- https://access.redhat.com/security/cve/CVE-2017-17742
- https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1789557
- https://github.com/ruby/ruby/commit/3ce238b5f9795581eb84114dcfbdf4aa086bfecc
- https://security-tracker.debian.org/tracker/CVE-2019-16254
- https://ubuntu.com/security/notices/USN-4201-1
- https://www.cve.org/CVERecord?id=CVE-2019-16254
- https://nvd.nist.gov/vuln/detail/CVE-2019-16254
- https://github.com/ruby/ruby/commit/f98b3023bd786b4e7dfdb94b573a5f5d3d37d145
- https://ubuntu.com/security/CVE-2019-16254
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2019-16254?
CVE-2019-16254 is a vulnerability in Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 that allows HTTP Response Splitting.
How does CVE-2019-16254 work?
If an attacker inserts untrusted input into the response header of a program using WEBrick, they can exploit the vulnerability to insert a newline character and inject malicious content to deceive clients.
What is the severity of CVE-2019-16254?
CVE-2019-16254 has a severity rating of medium with a CVSS score of 5.3.
Which versions of Ruby are affected by CVE-2019-16254?
Ruby versions 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 are affected by CVE-2019-16254.
How can I fix CVE-2019-16254?
To fix CVE-2019-16254, update Ruby to version 2.4.8, 2.5.7, or 2.6.5 or later as appropriate for your version.
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2019-16254
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- agent/description
- collector/nvd-cve
- source/NVD
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/remedy
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/tags
- agent/event
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/ruby-lang
- canonical/ruby-lang ruby
- version/ruby-lang ruby/2.3.0
- version/ruby-lang ruby/2.4.0
- version/ruby-lang ruby/2.4.7
- version/ruby-lang ruby/2.5.0
- version/ruby-lang ruby/2.5.6
- version/ruby-lang ruby/2.6.0
- version/ruby-lang ruby/2.6.4
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/8.0
- package-manager/ubuntu
- package-manager/debian