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Ubuntu Security Notice USN-4888-2

Ubuntu Security Notice USN-4888-2
Posted Mar 26, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4888-2 - USN-4888-1 fixed several vulnerabilities in ldb. This update provides the corresponding update for Ubuntu 14.04 ESM. 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-27840, CVE-2021-20277
MD5 | a7edc38f2801676f33f9cbf0c9e31080

Ubuntu Security Notice USN-4888-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4888-2
March 25, 2021

ldb vulnerabilities
==========================================================================

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
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