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Category:   Application (Directory)  >   OpenLDAP Vendors:   OpenLDAP.org
(Red Hat Issues Fix) OpenLDAP Cipherstring Parsing Bug Lets Remote Users Downgrade the Encryption Cipher
SecurityTracker Alert ID:  1034248
SecurityTracker URL:  http://securitytracker.com/id/1034248
CVE Reference:   CVE-2015-3276   (Links to External Site)
Date:  Nov 25 2015
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenLDAP. A remote user can cause the target system to use a different encryption cipher than specified in the configuration.

The system does not properly parse OpenSSL-style cipher strings in multi-keyword mode. A remote user can send a specially crafted cipher request to cause the target system to use a cipher that was not intended to be used.

Martin Poole of the Red Hat Software Maintenance Engineering group reported this vulnerability.

Impact:   A remote user can cause the target system to use a different encryption cipher than specified in the configuration.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-2131.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-2131.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Nov 24 2015 OpenLDAP Cipherstring Parsing Bug Lets Remote Users Downgrade the Encryption Cipher



 Source Message Contents

Subject:  [RHSA-2015:2131-03] Moderate: openldap security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: openldap security, bug fix, and enhancement update
Advisory ID:       RHSA-2015:2131-03
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-2131.html
Issue date:        2015-11-19
CVE Names:         CVE-2015-3276 
=====================================================================

1. Summary:

Updated openldap packages that fix one security issue, several bugs, and
add one enhancement are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

OpenLDAP is an open-source suite of Lightweight Directory Access Protocol
(LDAP) applications and development tools. LDAP is a set of protocols used
to access and maintain distributed directory information services over an
IP network. The openldap packages contain configuration files, libraries,
and documentation for OpenLDAP.

A flaw was found in the way OpenLDAP parsed OpenSSL-style cipher strings.
As a result, OpenLDAP could potentially use ciphers that were not intended
to be enabled. (CVE-2015-3276)

This issue was discovered by Martin Poole of the Red Hat Software
Maintenance Engineering group.

The openldap packages have been upgraded to upstream version 2.4.40, which
provides a number of bug fixes and one enhancement over the previous
version:

* The ORDERING matching rules have been added to the ppolicy attribute type
descriptions.
* The server no longer terminates unexpectedly when processing SRV records.
* Missing objectClass information has been added, which enables the user to
modify the front-end configuration by standard means.

(BZ#1147982)

This update also fixes the following bugs:

* Previously, OpenLDAP did not properly handle a number of simultaneous
updates. As a consequence, sending a number of parallel update requests to
the server could cause a deadlock. With this update, a superfluous locking
mechanism causing the deadlock has been removed, thus fixing the bug.
(BZ#1125152)

* The httpd service sometimes terminated unexpectedly with a segmentation
fault on the libldap library unload. The underlying source code has been
modified to prevent a bad memory access error that caused the bug to occur.
As a result, httpd no longer crashes in this situation. (BZ#1158005)

* After upgrading the system from Red Hat Enterprise Linux 6 to Red Hat
Enterprise Linux 7, symbolic links to certain libraries unexpectedly
pointed to locations belonging to the openldap-devel package. If the user
uninstalled openldap-devel, the symbolic links were broken and the "rpm -V
openldap" command sometimes produced errors. With this update, the symbolic
links no longer get broken in the described situation. If the user
downgrades openldap to version 2.4.39-6 or earlier, the symbolic links
might break. After such downgrade, it is recommended to verify that the
symbolic links did not break. To do this, make sure the yum-plugin-verify
package is installed and obtain the target libraries by running the "rpm -V
openldap" or "yum verify openldap" command. (BZ#1230263)

In addition, this update adds the following enhancement:

* OpenLDAP clients now automatically choose the Network Security Services
(NSS) default cipher suites for communication with the server. It is no
longer necessary to maintain the default cipher suites manually in the
OpenLDAP source code. (BZ#1245279)

All openldap users are advised to upgrade to these updated packages, which
correct these issues and add this enhancement.

4. 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

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

1147982 - Rebase openldap to 2.4.40
1158005 - OpenLDAP crash in NSS shutdown handling
1174634 - pwdChecker library requires version in pwdCheckModule attribute
1174723 - values for pwdChecker are not set to default values
1175415 - openldap: crash in ldap_domain2hostlist when processing SRV records
1184585 - slaptest doesn't convert perlModuleConfig lines
1209229 - openldap-servers leverages 'find' from findutils which is not a dep of the rpm
1226600 - olcDatabase in olcFrontend attribute incorrect/faulty
1230263 - rpm -V openldap complains
1231228 - automount via ldap with TLS/SSL support is not working
1238322 - CVE-2015-3276 openldap: incorrect multi-keyword mode cipherstring parsing
1245279 - OpenLDAP doesn't use sane (or default) cipher order

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
openldap-2.4.40-8.el7.src.rpm

x86_64:
openldap-2.4.40-8.el7.i686.rpm
openldap-2.4.40-8.el7.x86_64.rpm
openldap-clients-2.4.40-8.el7.x86_64.rpm
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm

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

x86_64:
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-devel-2.4.40-8.el7.i686.rpm
openldap-devel-2.4.40-8.el7.x86_64.rpm
openldap-servers-2.4.40-8.el7.x86_64.rpm
openldap-servers-sql-2.4.40-8.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
openldap-2.4.40-8.el7.src.rpm

x86_64:
openldap-2.4.40-8.el7.i686.rpm
openldap-2.4.40-8.el7.x86_64.rpm
openldap-clients-2.4.40-8.el7.x86_64.rpm
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm

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

x86_64:
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-devel-2.4.40-8.el7.i686.rpm
openldap-devel-2.4.40-8.el7.x86_64.rpm
openldap-servers-2.4.40-8.el7.x86_64.rpm
openldap-servers-sql-2.4.40-8.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
openldap-2.4.40-8.el7.src.rpm

aarch64:
openldap-2.4.40-8.el7.aarch64.rpm
openldap-clients-2.4.40-8.el7.aarch64.rpm
openldap-debuginfo-2.4.40-8.el7.aarch64.rpm
openldap-devel-2.4.40-8.el7.aarch64.rpm
openldap-servers-2.4.40-8.el7.aarch64.rpm

ppc64:
openldap-2.4.40-8.el7.ppc.rpm
openldap-2.4.40-8.el7.ppc64.rpm
openldap-clients-2.4.40-8.el7.ppc64.rpm
openldap-debuginfo-2.4.40-8.el7.ppc.rpm
openldap-debuginfo-2.4.40-8.el7.ppc64.rpm
openldap-devel-2.4.40-8.el7.ppc.rpm
openldap-devel-2.4.40-8.el7.ppc64.rpm
openldap-servers-2.4.40-8.el7.ppc64.rpm

ppc64le:
openldap-2.4.40-8.el7.ppc64le.rpm
openldap-clients-2.4.40-8.el7.ppc64le.rpm
openldap-debuginfo-2.4.40-8.el7.ppc64le.rpm
openldap-devel-2.4.40-8.el7.ppc64le.rpm
openldap-servers-2.4.40-8.el7.ppc64le.rpm

s390x:
openldap-2.4.40-8.el7.s390.rpm
openldap-2.4.40-8.el7.s390x.rpm
openldap-clients-2.4.40-8.el7.s390x.rpm
openldap-debuginfo-2.4.40-8.el7.s390.rpm
openldap-debuginfo-2.4.40-8.el7.s390x.rpm
openldap-devel-2.4.40-8.el7.s390.rpm
openldap-devel-2.4.40-8.el7.s390x.rpm
openldap-servers-2.4.40-8.el7.s390x.rpm

x86_64:
openldap-2.4.40-8.el7.i686.rpm
openldap-2.4.40-8.el7.x86_64.rpm
openldap-clients-2.4.40-8.el7.x86_64.rpm
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-devel-2.4.40-8.el7.i686.rpm
openldap-devel-2.4.40-8.el7.x86_64.rpm
openldap-servers-2.4.40-8.el7.x86_64.rpm

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

aarch64:
openldap-debuginfo-2.4.40-8.el7.aarch64.rpm
openldap-servers-sql-2.4.40-8.el7.aarch64.rpm

ppc64:
openldap-debuginfo-2.4.40-8.el7.ppc64.rpm
openldap-servers-sql-2.4.40-8.el7.ppc64.rpm

ppc64le:
openldap-debuginfo-2.4.40-8.el7.ppc64le.rpm
openldap-servers-sql-2.4.40-8.el7.ppc64le.rpm

s390x:
openldap-debuginfo-2.4.40-8.el7.s390x.rpm
openldap-servers-sql-2.4.40-8.el7.s390x.rpm

x86_64:
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-servers-sql-2.4.40-8.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
openldap-2.4.40-8.el7.src.rpm

x86_64:
openldap-2.4.40-8.el7.i686.rpm
openldap-2.4.40-8.el7.x86_64.rpm
openldap-clients-2.4.40-8.el7.x86_64.rpm
openldap-debuginfo-2.4.40-8.el7.i686.rpm
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-devel-2.4.40-8.el7.i686.rpm
openldap-devel-2.4.40-8.el7.x86_64.rpm
openldap-servers-2.4.40-8.el7.x86_64.rpm

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

x86_64:
openldap-debuginfo-2.4.40-8.el7.x86_64.rpm
openldap-servers-sql-2.4.40-8.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3276
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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