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Vulnerability of Ruby: information disclosure via WEBrick HTTP Response Splitting

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via WEBrick HTTP Response Splitting of Ruby, in order to obtain sensitive information.
Impacted products: Debian, openSUSE Leap, Solaris, SLES, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 26/11/2019.
Références of this threat: CVE-2019-16254, DLA-2007-1, DLA-2027-1, DSA-4586-1, DSA-4587-1, openSUSE-SU-2020:0395-1, SUSE-SU-2020:0737-1, USN-4201-1, VIGILANCE-VUL-30969.

Description of the vulnerability 

An attacker can bypass access restrictions to data via WEBrick HTTP Response Splitting of Ruby, in order to obtain sensitive information.
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This cybersecurity bulletin impacts software or systems such as Debian, openSUSE Leap, Solaris, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer vulnerability bulletin.

Solutions for this threat 

Debian 10: new ruby2.5 packages.
New packages are available:
  Debian 10: ruby2.5 2.5.5-3+deb10u1

Debian 8: new jruby packages.
New packages are available:
  Debian 8: jruby 1.5.6-9+deb8u2

Debian 8: new ruby2.1 packages.
New packages are available:
  Debian 8: ruby2.1 2.1.5-2+deb8u8

Debian 9: new ruby2.3 packages.
New packages are available:
  Debian 9: ruby2.3 2.3.3-1+deb9u7

openSUSE Leap 15.1: new ruby2.5 packages.
New packages are available:
  openSUSE Leap 15.1: ruby2.5 2.5.7-lp151.4.6.1

Oracle Solaris: patch for third party software of Januray 2020 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 15: new ruby2.5 packages.
New packages are available:
  SUSE LE 15 RTM: ruby2.5 2.5.7-4.8.1
  SUSE LE 15 SP1: ruby2.5 2.5.7-4.8.1

Ubuntu: new ruby packages.
New packages are available:
  Ubuntu 19.10: libruby2.5 2.5.5-4ubuntu2.1, ruby2.5 2.5.5-4ubuntu2.1
  Ubuntu 19.04: libruby2.5 2.5.5-1ubuntu1.1, ruby2.5 2.5.5-1ubuntu1.1
  Ubuntu 18.04 LTS: libruby2.5 2.5.1-1ubuntu1.6, ruby2.5 2.5.1-1ubuntu1.6
  Ubuntu 16.04 LTS: libruby2.3 2.3.1-2~ubuntu16.04.14, ruby2.3 2.3.1-2~ubuntu16.04.14

Wind River Linux: version 10.18.44.14.
The version 10.18.44.14 is fixed:
  https://support2.windriver.com/
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