USN-4888-1: ldb vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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)

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

• libldb2 - 2:2.0.10-0ubuntu0.20.04.3

Ubuntu 18.04

• libldb1 - 2:1.2.3-1ubuntu0.2

Ubuntu 16.04

• 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

• CVE-2021-20277
• CVE-2020-27840

Related notices

• USN-4888-2: python-ldb-dev, libldb1, libldb-dev, python-ldb, ldb-tools, ldb