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Vulnerability of Netty: information disclosure via Transfer-Encoding Whitespace Request Smuggling

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Transfer-Encoding Whitespace Request Smuggling of Netty, in order to obtain sensitive information.
Impacted products: Debian, JBoss EAP by Red Hat, Red Hat SSO, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 20/02/2020.
Références of this threat: CERTFR-2020-AVI-179, CVE-2020-7238, DLA-2109-1, DLA-2110-1, DLA-2364-1, RHSA-2020:0605-01, RHSA-2020:0606-01, RHSA-2020:0804-01, RHSA-2020:0805-01, RHSA-2020:0806-01, RHSA-2020:0811-01, RHSA-2020:0951-01, RHSA-2020:0952-01, USN-4600-1, VIGILANCE-VUL-31647.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Transfer-Encoding Whitespace Request Smuggling of Netty, in order to obtain sensitive information.
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This weakness bulletin impacts software or systems such as Debian, JBoss EAP by Red Hat, Red Hat SSO, Ubuntu.

Our Vigil@nce team determined that the severity of this computer 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 vulnerability announce.

Solutions for this threat 

Debian 8: new netty-3.9 packages.
New packages are available:
  Debian 8: netty-3.9 3.9.0.Final-1+deb8u1

Debian 8: new netty packages.
New packages are available:
  Debian 8: netty 1:3.2.6.Final-2+deb8u2

Debian 9: new netty packages.
New packages are available:
  Debian 9: netty 1:4.1.7-2+deb9u2

Red Hat JBoss EAP: patch for Netty.
A patch is available:
  https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.2/

Red Hat JBoss EAP: version 7.2.7.
The version 7.2.7 is fixed.

Red Hat Single Sign-On: version 7.3.7.
The version 7.3.7 is fixed:
  https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=core.service.rhsso&downloadType=securityPatches&version=7.3

Ubuntu 16.04: new libnetty-3.9-java packages.
New packages are available:
  Ubuntu 16.04 LTS: libnetty-3.9-java 3.9.0.Final-1ubuntu0.1
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