========================================================================== Ubuntu Security Notice USN-4888-1 March 24, 2021 ldb vulnerabilities ========================================================================== 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: Several security issues were fixed in ldb. Software Description: - ldb: None 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) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: libldb2 2:2.1.4-2ubuntu0.1 Ubuntu 20.04 LTS: libldb2 2:2.0.10-0ubuntu0.20.04.3 Ubuntu 18.04 LTS: libldb1 2:1.2.3-1ubuntu0.2 Ubuntu 16.04 LTS: libldb1 2:1.1.24-1ubuntu3.2 After a standard system update you need to restart applications using ldb, such as Samba, to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-4888-1 CVE-2020-27840, CVE-2021-20277 Package Information: https://launchpad.net/ubuntu/+source/ldb/2:2.1.4-2ubuntu0.1 https://launchpad.net/ubuntu/+source/ldb/2:2.0.10-0ubuntu0.20.04.3 https://launchpad.net/ubuntu/+source/ldb/2:1.2.3-1ubuntu0.2 https://launchpad.net/ubuntu/+source/ldb/2:1.1.24-1ubuntu3.2