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Vulnerability of GNU libidn2: buffer overflow via idn2_to_ascii_4i

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via idn2_to_ascii_4i() of GNU libidn2, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian, openSUSE Leap, Solaris, SLES, Ubuntu.
Severity of this weakness: 3/4.
Creation date: 29/10/2019.
Références of this bulletin: CVE-2019-18224, DSA-4613-1, openSUSE-SU-2019:2611-1, openSUSE-SU-2019:2613-1, SUSE-SU-2019:3086-1, USN-4168-1, VIGILANCE-VUL-30738.

Description of the vulnerability 

An attacker can trigger a buffer overflow via idn2_to_ascii_4i() of GNU libidn2, in order to trigger a denial of service, and possibly to run code.
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This security announce impacts software or systems such as Debian, openSUSE Leap, Solaris, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat is important.

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 announce.

Solutions for this threat 

Debian 10: new libidn2 packages.
New packages are available:
  Debian 10: libidn2 2.0.5-1+deb10u1

openSUSE Leap 15: new libidn2 packages.
New packages are available:
  openSUSE Leap 15.0: libidn2 0-2.2.0-lp150.2.3.1
  openSUSE Leap 15.1: libidn2 0-2.2.0-lp151.3.3.1

Oracle Solaris: patch for third party software of October 2019 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 15: new libidn2 packages.
New packages are available:
  SUSE LE 15 RTM: libidn2 2.2.0-3.3.1
  SUSE LE 15 SP1: libidn2 2.2.0-3.3.1

Ubuntu: new libidn2-0 packages.
New packages are available:
  Ubuntu 19.04: idn2 2.0.5-1ubuntu0.3, libidn2-0 2.0.5-1ubuntu0.3
  Ubuntu 18.04 LTS: idn2 2.0.4-1.1ubuntu0.2, libidn2-0 2.0.4-1.1ubuntu0.2
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