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Vulnerability of RubyGem Puma: information disclosure via Newline Response Splitting

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Newline Response Splitting of RubyGem Puma, in order to obtain sensitive information.
Vulnerable products: Fedora, openSUSE Leap, SLES.
Severity of this weakness: 2/4.
Creation date: 10/04/2020.
Références of this bulletin: CVE-2020-5247, FEDORA-2020-08092b4c97, FEDORA-2020-fd87f90634, openSUSE-SU-2020:1993-1, openSUSE-SU-2020:2000-1, SUSE-SU-2020:3036-1, SUSE-SU-2020:3147-1, SUSE-SU-2020:3160-1, VIGILANCE-VUL-31986.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Newline Response Splitting of RubyGem Puma, in order to obtain sensitive information.
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This threat alert impacts software or systems such as Fedora, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin 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 weakness note.

Solutions for this threat 

Fedora: new rubygem-puma packages.
New packages are available:
  Fedora 30: rubygem-puma 3.12.4-1.fc30
  Fedora 31: rubygem-puma 3.12.4-1.fc31

openSUSE Leap 15.1: new rmt-server packages (24/11/2020).
New packages are available:
  openSUSE Leap 15.1: rmt-server 2.6.5-lp151.2.18.2

openSUSE Leap 15.2: new rmt-server packages.
New packages are available:
  openSUSE Leap 15.2: rmt-server 2.6.5-lp152.2.3.1

SUSE LE 15 RTM: new rmt-server packages.
New packages are available:
  SUSE LE 15 RTM: rmt-server 2.6.5-3.34.1

SUSE LE 15 SP1: new rmt-server packages (05/11/2020).
New packages are available:
  SUSE LE 15 SP1: rmt-server 2.6.5-3.18.1

SUSE LE 15 SP2: new rmt-server packages.
New packages are available:
  SUSE LE 15 SP2: rmt-server 2.6.5-3.3.1
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