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Vulnerability of MIT krb5: denial of service via asn1_encode.c

Synthesis of the vulnerability 

An attacker can trigger a fatal error via asn1_encode.c of MIT krb5, in order to trigger a denial of service.
Vulnerable products: Debian, Fedora, MIT krb5, MySQL Community, MySQL Enterprise, openSUSE Leap, Percona Server, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 09/11/2020.
Références of this bulletin: cpuapr2021, CVE-2020-28196, DLA-2437-1, DSA-4795-1, FEDORA-2020-0df38b2843, FEDORA-2020-27b577ab23, FEDORA-2020-32193cbbe6, openSUSE-SU-2020:2037-1, openSUSE-SU-2020:2062-1, SUSE-SU-2020:3375-1, SUSE-SU-2020:3377-1, SUSE-SU-2020:3379-1, USN-4635-1, VIGILANCE-VUL-33846.

Description of the vulnerability 

An attacker can trigger a fatal error via asn1_encode.c of MIT krb5, in order to trigger a denial of service.
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This threat announce impacts software or systems such as Debian, Fedora, MIT krb5, MySQL Community, MySQL Enterprise, openSUSE Leap, Percona Server, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

MIT krb5: version 1.18.3.
The version 1.18.3 is fixed:
  https://web.mit.edu/kerberos/krb5-1.18/

MIT krb5: version 1.17.2.
The version 1.17.2 is fixed:
  https://web.mit.edu/kerberos/krb5-1.17/

MIT krb5: patch for asn1_encode.c.
A patch is indicated in information sources.

Debian 10: new krb5 packages.
New packages are available:
  Debian 10: krb5 1.17-3+deb10u1

Debian 9: new krb5 packages.
New packages are available:
  Debian 9: krb5 1.15-1+deb9u2

Fedora 31: new krb5 packages.
New packages are available:
  Fedora 31: krb5 1.17-47.fc31

Fedora 32: new krb5 packages.
New packages are available:
  Fedora 32: krb5 1.18.2-29.fc32

Fedora 33: new krb5 packages.
New packages are available:
  Fedora 33: krb5 1.18.2-29.fc33

openSUSE Leap 15.1: new krb5 packages.
New packages are available:
  openSUSE Leap 15.1: krb5 1.16.3-lp151.2.15.1

openSUSE Leap 15.2: new krb5 packages.
New packages are available:
  openSUSE Leap 15.2: krb5 1.16.3-lp152.5.13.1

Oracle MySQL: version 5.7.34.
The version 5.7.34 is fixed:
  https://support.oracle.com/rs?type=doc&id=2764660.1
  https://www.mysql.com/fr/downloads/
  https://dev.mysql.com/downloads/mysql/

Oracle MySQL: version 8.0.24.
The version 8.0.24 is fixed:
  https://support.oracle.com/rs?type=doc&id=2764660.1
  https://www.mysql.com/fr/downloads/
  https://dev.mysql.com/downloads/mysql/

SUSE LE 12 SP2-5: new krb5 packages.
New packages are available:
  SUSE LE 12 SP2: krb5 1.12.5-40.40.2
  SUSE LE 12 SP3: krb5 1.12.5-40.40.2
  SUSE LE 12 SP4: krb5 1.12.5-40.40.2
  SUSE LE 12 SP5: krb5 1.12.5-40.40.2

SUSE LE 15 RTM: new krb5 packages.
New packages are available:
  SUSE LE 15 RTM: krb5 1.15.2-6.12.2

SUSE LE 15 SP1-2: new krb5 packages.
New packages are available:
  SUSE LE 15 SP1: krb5 1.16.3-3.15.1
  SUSE LE 15 SP2: krb5 1.16.3-3.15.1

Ubuntu: new krb5 packages.
New packages are available:
  Ubuntu 20.10: krb5 1.17-10ubuntu0.1
  Ubuntu 20.04 LTS: krb5 1.17-6ubuntu4.1
  Ubuntu 18.04 LTS: krb5 1.16-2ubuntu0.2
  Ubuntu 16.04 LTS: krb5 1.13.2+dfsg-5ubuntu2.2
  Ubuntu 14.04 ESM: krb5 1.12+dfsg-2ubuntu5.4+esm2
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