1. Ubuntu Security Notices
  2. USN-4888-1

USN-4888-1: ldb vulnerabilities

Publication date

24 March 2021

Overview

Several security issues were fixed in ldb.

Releases

Packages

  • ldb - LDAP-like embedded database

Details

Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain LDAP attributes. A remote attacker could possibly use this
issue to cause the LDAP server to crash, resulting in a denial of service.
(CVE-2021-20277)

Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain DN strings. A remote attacker could use this issue to
cause the LDAP server to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2020-27840)

Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain LDAP attributes. A remote attacker could possibly use this
issue to cause the LDAP server to crash, resulting in a denial of service.
(CVE-2021-20277)

Douglas Bagnall discovered that ldb, when used with Samba, incorrectly
handled certain DN strings. A remote attacker could use this issue to
cause the LDAP server to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2020-27840)

Update instructions

After a standard system update you need to restart applications using ldb, such as Samba, 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
20.10 groovy libldb2 –  2:2.1.4-2ubuntu0.1
20.04 focal libldb2 –  2:2.0.10-0ubuntu0.20.04.3
18.04 bionic libldb1 –  2:1.2.3-1ubuntu0.2
16.04 xenial libldb1 –  2:1.1.24-1ubuntu3.2

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References

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