HTTP Response Splitting in Ruby - CVE-2019-16254

Vulnerability identifier: #VU23008

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-16254

CWE-ID: CWE-113

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform HTTP response splitting attack.

The vulnerability exists due to insufficient validation of CRLF sequences within the WEBrick in Ruby. A remote attacker can send a specially crafted request to the application and perform a spoofing attack.

Ruby
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Opensuse
Red Hat Software Collections
ruby (Alpine package)
ruby2.3 (Debian package)
ruby2.5 (Debian package)
ruby2.5 (Ubuntu package)
rh-ruby25-ruby (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
rh-ruby26-ruby (Red Hat package)
EMC Integrated Data Protection Appliance
IBM Cloud Foundry Migration Runtime
Dell EMC Data Protection Search

Install updates from vendor's website.

Ruby - addressed in versions 2.4.8, 2.5.7, 2.6.5
ruby (Alpine package) - update to 2.5.7-r0
EMC Integrated Data Protection Appliance - update to 2.7.1
ruby2.3 (Debian package) - update to 2.3.3-1+deb9u7
ruby2.5 (Debian package) - update to 2.5.5-3+deb10u1
ruby2.5 (Ubuntu package) - addressed in versions 2.5.1-1ubuntu1.6, 2.5.5-1ubuntu1.1, 2.5.5-4ubuntu2.1
rh-ruby25-ruby (Red Hat package) - update to 2.5.9-9.el7
IBM Cloud Foundry Migration Runtime - update to 4.1.2
Dell EMC Data Protection Search - update to 19.6.0
rh-ruby26-ruby (Red Hat package) - update to 2.6.7-119.el7

• https://www.ruby-lang.org/en/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://hackerone.com/reports/331984

• Multiple vulnerabilities in Ruby
• Ubuntu update for Ruby
• Debian update for ruby2.3
• Debian update for ruby2.5
• Gentoo update for Ruby
• OpenSUSE update for ruby
• HTTP Response Splitting in ruby (Alpine package)
• Amazon Linux AMI update for ruby24
• Red Hat Software Collections update for rh-ruby25-ruby
• Red Hat Software Collections update for rh-ruby26-ruby
• Red Hat Enterprise Linux 8 update for the ruby:2.5 module
• Red Hat Enterprise Linux 8 update for the ruby:2.6 module
• Red Hat Enterprise Linux 8.1 update for the ruby:2.6 module
• Red Hat Enterprise Linux 8.2 update for the ruby:2.6 module
• Multiple vulnerabilities in Dell EMC Integrated Data Protection Appliance
• Multiple vulnerabilities in Dell EMC Data Protection Search
• Multiple vulnerabilities in IBM Cloud Foundry Migration Runtime