RHSA-2016:0204 - Security Advisory

Topic

Updated 389-ds-base packages that fix one security issue and several bugs
are now available for Red Hat Enterprise Linux 7.

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

Description

The 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.

An infinite-loop vulnerability was discovered in the 389 directory server,
where the server failed to correctly handle unexpectedly closed client
connections. A remote attacker able to connect to the server could use this
flaw to make the directory server consume an excessive amount of CPU and
stop accepting connections (denial of service). (CVE-2016-0741)

This update fixes the following bugs:

• Previously, if a simple paged results search failed in the back end, the

simple paged results slot was not released. Consequently, the simple paged
results slots in a connection object could be accumulated. With this
update, the simple paged results slot is released correctly when a search
fails, and unused simple paged results slots are no longer left in a
connection object. (BZ#1290725)

• Previously, when several values of the same attribute were deleted using

the ldapmodify command, and at least one of them was added again during the
same operation, the equality index was not updated. As a consequence, an
exact search for the re-added attribute value did not return the entry. The
logic of the index code has been modified to update the index if at least
one of the values in the entry changes, and the exact search for the
re-added attribute value now returns the correct entry. (BZ#1290726)

• Prior to this update, when the cleanAllRUV task was running, a bogus

attrlist_replace error message was logged repeatedly due to a memory
corruption. With this update, the appropriate memory copy function memmove
is used, which fixes the memory corruption. As a result, the error messages
are no longer logged in this scenario. (BZ#1295684)

• To fix a simple paged results bug, an exclusive lock on a connection was

previously added. This consequently caused a self deadlock in a particular
case. With this update, the exclusive lock on a connection has been changed
to the re-entrant type, and the self deadlock no longer occurs.
(BZ#1298105)

• Previously, an unnecessary lock was sometimes acquired on a connection

object, which could consequently cause a deadlock. A patch has been applied
to remove the unnecessary locking, and the deadlock no longer occurs.
(BZ#1299346)

Users of 389-ds-base are advised to upgrade to these updated packages,
which correct these issues. After installing this update, the 389 server
service will be restarted automatically.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.2 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.2 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.2 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.3 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - TUS 7.2 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.7 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.3 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.2 x86_64

Fixes

• BZ - 1290725 - SimplePagedResults -- in the search error case, simple paged results slot was not released.
• BZ - 1290726 - The 'eq' index does not get updated properly when deleting and re-adding attributes in the same ldapmodify operation
• BZ - 1295684 - many attrlist_replace errors in connection with cleanallruv
• BZ - 1299346 - deadlock on connection mutex
• BZ - 1299416 - CVE-2016-0741 389-ds-base: worker threads do not detect abnormally closed connections causing DoS

CVEs

• CVE-2016-0741

References

• http://www.redhat.com/security/updates/classification/#normal