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Vulnerability of OpenLDAP: assertion error via issuerAndThisUpdateCheck

Synthesis of the vulnerability 

An attacker can force an assertion error via issuerAndThisUpdateCheck() of OpenLDAP, in order to trigger a denial of service.
Vulnerable systems: Debian, OpenLDAP, openSUSE Leap, Solaris, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 15/02/2021.
Références of this weakness: CVE-2021-27212, DLA-2574-1, DSA-4860-1, openSUSE-SU-2021:0408-1, SSB-439005, SUSE-SU-2021:0692-1, SUSE-SU-2021:0693-1, SUSE-SU-2021:0723-1, SUSE-SU-2021:14700-1, USN-4744-1, VIGILANCE-VUL-34580.

Description of the vulnerability 

An attacker can force an assertion error via issuerAndThisUpdateCheck() of OpenLDAP, in order to trigger a denial of service.
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This cybersecurity weakness impacts software or systems such as Debian, OpenLDAP, openSUSE Leap, Solaris, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

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

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

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

Debian 10: new openldap packages.
New packages are available:
  Debian 10: openldap 2.4.47+dfsg-3+deb10u6

Debian 9: new openldap packages.
New packages are available:
  Debian 9: openldap 2.4.44+dfsg-5+deb9u8

openSUSE Leap 15.2: new openldap2 packages.
New packages are available:
  openSUSE Leap 15.2: openldap2 2.4.46-lp152.14.18.1

Oracle Solaris: patch for third party software of April 2021 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.

SUSE LE 11 SP3-4: new openldap2 packages.
New packages are available:
  SUSE LE 11 SP3: openldap2 2.4.26-0.74.26.1
  SUSE LE 11 SP4: openldap2 2.4.26-0.74.26.1

SUSE LE 12 SP2-5: new compat-libldap packages.
New packages are available:
  SUSE LE 12 SP2: compat-libldap 2_3-0-2.3.37-39.1
  SUSE LE 12 SP3: compat-libldap 2_3-0-2.3.37-39.1
  SUSE LE 12 SP4: compat-libldap 2_3-0-2.3.37-39.1
  SUSE LE 12 SP5: compat-libldap 2_3-0-2.3.37-39.1

SUSE LE 12 SP2-5: new openldap2 packages.
New packages are available:
  SUSE LE 12 SP2: openldap2 2.4.41-18.83.1
  SUSE LE 12 SP3: openldap2 2.4.41-18.83.1
  SUSE LE 12 SP4: openldap2 2.4.41-18.83.1
  SUSE LE 12 SP5: openldap2 2.4.41-18.83.1

SUSE LE 15 RTM-SP3: new openldap2 packages.
New packages are available:
  SUSE LE 15 RTM: openldap2 2.4.46-9.48.1
  SUSE LE 15 SP1: openldap2 2.4.46-9.48.1
  SUSE LE 15 SP2: openldap2 2.4.46-9.48.1
  SUSE LE 15 SP3: openldap2 2.4.46-9.48.1

Ubuntu: new slapd packages.
New packages are available:
  Ubuntu 20.10: slapd 2.4.53+dfsg-1ubuntu1.4
  Ubuntu 20.04 LTS: slapd 2.4.49+dfsg-2ubuntu1.7
  Ubuntu 18.04 LTS: slapd 2.4.45+dfsg-1ubuntu1.10
  Ubuntu 16.04 LTS: slapd 2.4.42+dfsg-2ubuntu3.13
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