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Vulnerability of OpenLDAP: denial of service via search filters

Synthesis of the vulnerability 

An attacker can trigger a fatal error via search filters of OpenLDAP, in order to trigger a denial of service.
Vulnerable products: Debian, OpenLDAP, openSUSE Leap, Solaris, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 29/04/2020.
Revision date: 29/04/2020.
Références of this bulletin: CVE-2020-12243, DLA-2199-1, DSA-4666-1, openSUSE-SU-2020:0647-1, SUSE-SU-2020:1193-1, SUSE-SU-2020:1210-1, SUSE-SU-2020:1219-1, SUSE-SU-2020:14358-1, USN-4352-1, USN-4352-2, VIGILANCE-VUL-32124.

Description of the vulnerability 

An attacker can trigger a memory overuse via search filters of OpenLDAP, in order to trigger a denial of service.

See also VIGILANCE-VUL-32119.
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This vulnerability bulletin 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 security note 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 cybersecurity note.

Solutions for this threat 

OpenLDAP: version 2.4.50.
The version 2.4.50 is fixed:
  https://www.openldap.org/software/download/

Debian 8: new openldap packages.
New packages are available:
  Debian 8: openldap 2.4.40+dfsg-1+deb8u6

Debian 9, 10: new openldap packages.
New packages are available:
  Debian 9: openldap 2.4.44+dfsg-5+deb9u4
  Debian 10: openldap 2.4.47+dfsg-3+deb10u2

openSUSE Leap 15.1: new openldap2 packages.
New packages are available:
  openSUSE Leap 15.1: openldap2 2.4.46-lp151.10.9.1

Oracle Solaris: patch for third party software of April 2020 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 11, 12: new openldap2 packages.
New packages are available:
  SUSE LE 12 SP5: openldap2 2.4.41-18.68.1
  SUSE LE 12 SP4: openldap2 2.4.41-18.68.1
  SUSE LE 12 SP3: openldap2 2.4.41-18.68.1
  SUSE LE 12 SP2: openldap2 2.4.41-18.68.1
  SUSE LE 11 SP4: openldap2 2.4.26-0.74.9.1
  SUSE LE 11 RTM-SP4: openldap2-openssl1 2.4.26-0.74.9.1

SUSE LE 11 SP3/4: new openldap2 packages.
New packages are available:
  SUSE LE 11 SP3: openldap2 2.4.26-0.74.9.1
  SUSE LE 11 SP4: openldap2 2.4.26-0.74.9.1

SUSE LE 12 SP1: new openldap2 packages.
New packages are available:
  SUSE LE 12 SP1: openldap2 2.4.41-18.24.17.1

SUSE LE 15: new openldap2 packages.
New packages are available:
  SUSE LE 15 RTM: openldap2 2.4.46-9.28.2
  SUSE LE 15 SP1: openldap2 2.4.46-9.28.2

Ubuntu: new slapd packages.
New packages are available:
  Ubuntu 20.04 LTS: slapd 2.4.49+dfsg-2ubuntu1.2
  Ubuntu 19.10: slapd 2.4.48+dfsg-1ubuntu1.1
  Ubuntu 18.04 LTS: slapd 2.4.45+dfsg-1ubuntu1.5
  Ubuntu 16.04 LTS: slapd 2.4.42+dfsg-2ubuntu3.8
  Ubuntu 14.04 ESM: slapd 2.4.31-1+nmu2ubuntu8.5+esm2
  Ubuntu 12.04 ESM: slapd 2.4.28-1.1ubuntu4.10

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.8.
The version 10.19.45.8 is fixed.
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