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Vulnerability of OpenLDAP: NULL pointer dereference via modrdn

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via modrdn of OpenLDAP, in order to trigger a denial of service.
Impacted software: Debian, OpenLDAP, openSUSE Leap, Solaris, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 02/11/2020.
Références of this announce: CVE-2020-25692, DLA-2425-1, DSA-4782-1, openSUSE-SU-2020:1920-1, SUSE-SU-2020:14541-1, SUSE-SU-2020:3313-1, SUSE-SU-2020:3314-1, SUSE-SU-2020:3315-1, USN-4622-1, USN-4622-2, VIGILANCE-VUL-33748.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via modrdn of OpenLDAP, in order to trigger a denial of service.
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This vulnerability alert impacts software or systems such as Debian, OpenLDAP, openSUSE Leap, Solaris, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer vulnerability.

Solutions for this threat 

OpenLDAP: patch for modrdn.
A patch is indicated in information sources.

Debian 10: new openldap packages.
New packages are available:
  Debian 10: openldap 2.4.47+dfsg-3+deb10u3

Debian 9: new openldap packages.
New packages are available:
  Debian 9: openldap 2.4.44+dfsg-5+deb9u5

openSUSE Leap 15.1-2: new openldap2 packages.
New packages are available:
  openSUSE Leap 15.1: openldap2 2.4.46-lp151.10.21.1
  openSUSE Leap 15.2: openldap2 2.4.46-lp152.14.12.1

Oracle Solaris: patch for third party software of January 2021 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 11 SP3-4: new openldap2 packages.
New packages are available:
  SUSE LE 11 SP3: openldap2 2.4.26-0.74.16.1
  SUSE LE 11 SP4: openldap2 2.4.26-0.74.16.1

SUSE LE 12 SP2-5: new compat-libldap packages.
New packages are available:
  SUSE LE 12 SP2: compat-libldap 2_3-0-2.3.37-18.24.23.1
  SUSE LE 12 SP3: compat-libldap 2_3-0-2.3.37-18.24.23.1
  SUSE LE 12 SP4: compat-libldap 2_3-0-2.3.37-18.24.23.1
  SUSE LE 12 SP5: compat-libldap 2_3-0-2.3.37-18.24.23.1

SUSE LE 12 SP2-5: new openldap2 packages.
New packages are available:
  SUSE LE 12 SP2: openldap2 2.4.41-18.77.1
  SUSE LE 12 SP3: openldap2 2.4.41-18.77.1
  SUSE LE 12 SP4: openldap2 2.4.41-18.77.1
  SUSE LE 12 SP5: openldap2 2.4.41-18.77.1

SUSE LE 15: new openldap2 packages.
New packages are available:
  SUSE LE 15 RTM: openldap2 2.4.46-9.40.1
  SUSE LE 15 SP1: openldap2 2.4.46-9.40.1
  SUSE LE 15 SP2: openldap2 2.4.46-9.40.1

Ubuntu: new slapd packages.
New packages are available:
  Ubuntu 20.10: slapd 2.4.53+dfsg-1ubuntu1.1
  Ubuntu 20.04 LTS: slapd 2.4.49+dfsg-2ubuntu1.4
  Ubuntu 18.04 LTS: slapd 2.4.45+dfsg-1ubuntu1.7
  Ubuntu 16.04 LTS: slapd 2.4.42+dfsg-2ubuntu3.10
  Ubuntu 14.04 ESM: slapd 2.4.31-1+nmu2ubuntu8.5+esm3
  Ubuntu 12.04 ESM: slapd 2.4.28-1.1ubuntu4.11
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