-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0429
                   USN-4724-1: OpenLDAP vulnerabilities
                              9 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-2020-36230 CVE-2020-36229 CVE-2020-36228
                   CVE-2020-36227 CVE-2020-36226 CVE-2020-36225
                   CVE-2020-36224 CVE-2020-36223 CVE-2020-36222
                   CVE-2020-36221  

Reference:         ESB-2021.0391

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4724-1

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-4724-1: OpenLDAP vulnerabilities
08 February 2021

Several security issues were fixed in OpenLDAP.
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

It was discovered that OpenLDAP incorrectly handled Certificate Exact
Assertion processing. A remote attacker could possibly use this issue to
cause OpenLDAP to crash, resulting in a denial of service. ( CVE-2020-36221 )

It was discovered that OpenLDAP incorrectly handled saslAuthzTo processing.
A remote attacker could use this issue to cause OpenLDAP to crash,
resulting in a denial of service, or possibly execute arbitrary code.
( CVE-2020-36222 , CVE-2020-36224 , CVE-2020-36225 , CVE-2020-36226 )

It was discovered that OpenLDAP incorrectly handled Return Filter control
handling. A remote attacker could use this issue to cause OpenLDAP to
crash, resulting in a denial of service, or possibly execute arbitrary
code. ( CVE-2020-36223 )

It was discovered that OpenLDAP incorrectly handled certain cancel
operations. A remote attacker could possibly use this issue to cause
OpenLDAP to crash, resulting in a denial of service. ( CVE-2020-36227 )

It was discovered that OpenLDAP incorrectly handled Certificate List
Extract Assertion processing. A remote attacker could possibly use this
issue to cause OpenLDAP to crash, resulting in a denial of service.
( CVE-2020-36228 )

It was discovered that OpenLDAP incorrectly handled X.509 DN parsing. A
remote attacker could possibly use this issue to cause OpenLDAP to crash,
resulting in a denial of service. ( CVE-2020-36229 , CVE-2020-36230 )

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-1ubuntu1.3

Ubuntu 20.04

  o slapd - 2.4.49+dfsg-2ubuntu1.6

Ubuntu 18.04

  o slapd - 2.4.45+dfsg-1ubuntu1.9

Ubuntu 16.04

  o slapd - 2.4.42+dfsg-2ubuntu3.12

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

References

  o CVE-2020-36223
  o CVE-2020-36226
  o CVE-2020-36227
  o CVE-2020-36230
  o CVE-2020-36221
  o CVE-2020-36229
  o CVE-2020-36224
  o CVE-2020-36225
  o CVE-2020-36228
  o CVE-2020-36222

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=Y/MM
-----END PGP SIGNATURE-----