1. Ubuntu Security Notices
  2. USN-5231-1

USN-5231-1: 389 Directory Server vulnerabilities

Publication date

18 July 2022

Overview

Several security issues were fixed in 389 Directory Server.

Releases

Packages

Details

It was discovered that 389 Directory Server presented to users, during
authentication, an error message which could be used to discover if a
certain LDAP DN existed or not. A remote unauthenticated attacker could
possibly use this to check the existence of an entry in a LDAP database
and expose sensitive information. This issue affected only Ubuntu 20.04
ESM. (CVE-2020-35518)

It was discovered that 389 Directory Server was incorrectly validating
data used to access memory addresses. An authenticated attacker using a
Syncrepl client could use this issue with a specially crafted query to
cause 389 Directory Server to crash, resulting in a denial of service.
(CVE-2021-3514)

It was discovered that 389 Directory Server presented to users, during
authentication, an error message which could be used to discover if a
certain LDAP DN existed or not. A remote unauthenticated attacker could
possibly use this to check the existence of an entry in a LDAP database
and expose sensitive information. This issue affected only Ubuntu 20.04
ESM. (CVE-2020-35518)

It was discovered that 389 Directory Server was incorrectly validating
data used to access memory addresses. An authenticated attacker using a
Syncrepl client could use this issue with a specially crafted query to
cause 389 Directory Server to crash, resulting in a denial of service.
(CVE-2021-3514)

Update instructions

After a standard system update you need to restart 389 Directory server to make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.04 focal 389-ds-base –  1.4.3.6-2ubuntu0.1~esm1  
18.04 bionic 389-ds-base –  1.3.7.10-1ubuntu1+esm1  
16.04 xenial 389-ds-base –  1.3.4.9-1ubuntu0.1~esm1  

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References

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