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Ubuntu Security Notice USN-4888-2
March 25, 2021

ldb vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in ldb.

Software Description:
- ldb: LDAP-like embedded database

Details:

USN-4888-1 fixed several vulnerabilities in ldb. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  libldb1                         1:1.1.24-0ubuntu0.14.04.2+esm1

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-4888-2
  https://ubuntu.com/security/notices/USN-4888-1
  CVE-2020-27840, CVE-2021-20277