An OpenLDAP security update has been released for Ubuntu 14.04 ESM and 12.04 ESM.

USN-4352-2: OpenLDAP vulnerability

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Ubuntu Security Notice USN-4352-2
May 06, 2020

openldap vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

OpenLDAP could be made to crash if it received specially crafted
network traffic.

Software Description:
- openldap: Lightweight Directory Access Protocol

Details:

USN-4352-1 fixed a vulnerability in OpenLDAP. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that OpenLDAP incorrectly handled certain queries. A
remote attacker could possibly use this issue to cause OpenLDAP to consume
resources, resulting in a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
slapd 2.4.31-1+nmu2ubuntu8.5+esm2

Ubuntu 12.04 ESM:
slapd 2.4.28-1.1ubuntu4.10

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4352-2
  https://usn.ubuntu.com/4352-1
CVE-2020-12243