OpenLDAP: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0661
                    USN-4744-1: OpenLDAP vulnerability
                             23 February 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           OpenLDAP
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-27212  

Reference:         ESB-2021.0659
                   ESB-2021.0638

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4744-1

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USN-4744-1: OpenLDAP vulnerability
22 February 2021

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

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o 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

  o slapd - 2.4.53+dfsg-1ubuntu1.4

Ubuntu 20.04

  o slapd - 2.4.49+dfsg-2ubuntu1.7

Ubuntu 18.04

  o slapd - 2.4.45+dfsg-1ubuntu1.10

Ubuntu 16.04

  o slapd - 2.4.42+dfsg-2ubuntu3.13

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

References

  o CVE-2021-27212

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