Sigurnosni nedostaci programskog paketa 389-ds-base

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by - 26. rujna 2018.0

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Red Hat Security Advisory

Synopsis: Moderate: 389-ds-base security and bug fix update
Advisory ID: RHSA-2018:2757-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2757
Issue date: 2018-09-25
CVE Names: CVE-2018-10850 CVE-2018-10935 CVE-2018-14624
CVE-2018-14638
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1. Summary:

An update for 389-ds-base is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – ppc64le, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) – aarch64, ppc64le
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) – aarch64, ppc64le, s390x

3. Description:

389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The
base packages include the Lightweight Directory Access Protocol (LDAP)
server and command-line utilities for server administration.

Security Fix(es):

* 389-ds-base: race condition on reference counter leads to DoS using
persistent search (CVE-2018-10850)

* 389-ds-base: ldapsearch with server side sort allows users to cause a
crash (CVE-2018-10935)

* 389-ds-base: Server crash through modify command with large DN
(CVE-2018-14624)

* 389-ds-base: Crash in delete_passwdPolicy when persistent search
connections are terminated unexpectedly (CVE-2018-14638)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

The CVE-2018-10850 issue was discovered by Thierry Bordaz (Red Hat) and the
CVE-2018-14638 issue was discovered by Viktor Ashirov (Red Hat).

Bug Fix(es):

* Previously, the nucn-stans framework was enabled by default in Directory
Server, but the framework is not stable. As a consequence, deadlocks and
file descriptor leaks could occur. This update changes the default value of
the nsslapd-enable-nunc-stans parameter to “off”. As a result, Directory
Server is now stable. (BZ#1614836)

* When a search evaluates the “shadowAccount” entry, Directory Server adds
the shadow attributes to the entry. If the fine-grained password policy is
enabled, the “shadowAccount” entry can contain its own “pwdpolicysubentry”
policy attribute. Previously, to retrieve this attribute, the server
started an internal search for each “shadowAccount” entry, which was
unnecessary because the entry was already known to the server. With this
update, Directory Server only starts internal searches if the entry is not
known. As a result, the performance of searches, such as response time and
throughput, is improved. (BZ#1615924)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the 389 server service will be restarted
automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1588056 – CVE-2018-10850 389-ds-base: race condition on reference counter leads to DoS using persistent search
1613606 – CVE-2018-10935 389-ds-base: ldapsearch with server side sort allows users to cause a crash
1614836 – Disable nunc-stans by default [rhel-7.5.z]
1614861 – CVE-2018-10935 389-ds-base: ldapsearch with server side sort crashes the ldap server [rhel-7.5.z]
1615924 – Fine grained password policy can impact search performance [rhel-7.5.z]
1619450 – CVE-2018-14624 389-ds-base: Server crash through modify command with large DN
1623247 – CVE-2018-14624 389-ds-base: Server crash through modify command with large DN [rhel-7.5.z]
1626079 – CVE-2018-14638 389-ds-base: Crash in delete_passwdPolicy when persistent search connections are terminated unexpectedly

6. Package List:

Red Hat Enterprise Linux Client Optional (v. 7):