Ubuntu Security Notice USN-4744-1

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Ubuntu Security Notice USN-4744-1
February 22, 2021

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- openldap: Lightweight Directory Access Protocol

Details:

Pasi Saarinen discovered that OpenLDAP incorrectly handled certain short
timestamps. A remote attacker could possibly use this issue to cause
OpenLDAP to crash, resulting in a denial of service.

Update instructions:

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

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

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

References:
  https://usn.ubuntu.com/4744-1
  CVE-2021-27212

Package Information:
  https://launchpad.net/ubuntu/+source/openldap/2.4.53+dfsg-1ubuntu1.4
  https://launchpad.net/ubuntu/+source/openldap/2.4.49+dfsg-2ubuntu1.7
  https://launchpad.net/ubuntu/+source/openldap/2.4.45+dfsg-1ubuntu1.10
  https://launchpad.net/ubuntu/+source/openldap/2.4.42+dfsg-2ubuntu3.13