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Vulnerability of glibc: descriptor leak via getaddrinfo

Synthesis of the vulnerability 

An attacker can create a descriptor leak via getaddrinfo() of glibc, in order to trigger a denial of service.
Impacted products: Fedora, Solaris, SIMATIC, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 30/11/2018.
Références of this threat: bulletinjul2019, CVE-2018-19591, FEDORA-2018-060302dc83, FEDORA-2018-f6b7df660d, SSB-439005, USN-4416-1, VIGILANCE-VUL-27921.

Description of the vulnerability 

An attacker can create a descriptor leak via getaddrinfo() of glibc, in order to trigger a denial of service.
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This computer threat note impacts software or systems such as Fedora, Solaris, SIMATIC, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness alert 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 weakness note.

Solutions for this threat 

Fedora: new glibc packages.
New packages are available:
  Fedora 28: glibc 2.27-35.fc28
  Fedora 29: glibc 2.28-22.fc29

Oracle Solaris: patch for third party software of July 2019 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

Ubuntu: new libc6 packages (07/07/2020).
New packages are available:
  Ubuntu 19.10: libc6 2.30-0ubuntu2.2
  Ubuntu 18.04 LTS: libc6 2.27-3ubuntu1.2
  Ubuntu 16.04 LTS: libc6 2.23-0ubuntu11.2
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