[RHSA-2008:0389-02] Low: nss_ldap security and bug fix update

[news 28]

-----BEGIN PGP SIGNED MESSAGE-----

Hash: SHA1

 

=====================================================================

Red Hat Security Advisory

 

Synopsis: Low: nss_ldap security and bug fix update

Advisory ID: RHSA-2008:0389-02

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0389.html

Issue date: 2008-05-20

Updated on: 2008-05-21

Keywords: dns thread port rebuild exop referral

CVE Names: CVE-2007-5794

=====================================================================

 

1. Summary:

 

An updated nss_ldap package that fixes a security issue and several bugs is

now available.

 

This update has been rated as having low security impact by the Red Hat

Security Response Team.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

 

3. Description:

 

The nss_ldap package contains the nss_ldap and pam_ldap modules. The

nss_ldap module is a plug-in which allows applications to retrieve

information about users and groups from a directory server. The pam_ldap

module allows PAM-aware applications to use a directory server to verify

user passwords.

 

A race condition was discovered in nss_ldap which affected certain

applications which make LDAP connections, such as Dovecot. This could cause

nss_ldap to answer a request for information about one user with

information about a different user. (CVE-2007-5794)

 

In addition, these updated packages fix the following bugs:

 

* a build error prevented the nss_ldap module from being able to use DNS to

discover the location of a directory server. For example, when the

/etc/nsswitch.conf configuration file was configured to use "ldap", but no

"host" or "uri" option was configured in the /etc/ldap.conf configuration

file, no directory server was contacted, and no results were returned.

 

* the "port" option in the /etc/ldap.conf configuration file on client

machines was ignored. For example, if a directory server which you were

attempting to use was listening on a non-default port (i.e. not ports 389

or 636), it was only possible to use that directory server by including the

port number in the "uri" option. In this updated package, the "port" option

works as expected.

 

* pam_ldap failed to change an expired password if it had to follow a

referral to do so, which could occur, for example, when using a slave

directory server in a replicated environment. An error such as the

following occurred after entering a new password: "LDAP password

information update failed: Can't contact LDAP server Insufficient 'write'

privilege to the 'userPassword' attribute"

 

This has been resolved in this updated package.

 

* when the "pam_password exop_send_old" password-change method was

configured in the /etc/ldap.conf configuration file, a logic error in the

pam_ldap module caused client machines to attempt to change a user's

password twice. First, the pam_ldap module attempted to change the password

using the "exop" request, and then again using an LDAP modify request.

 

* on Red Hat Enterprise Linux 5.1, rebuilding nss_ldap-253-5.el5 when the

krb5-*-1.6.1-17.el5 packages were installed failed due to an error such as

the following:

 

+ /builddir/build/SOURCES/dlopen.sh ./nss_ldap-253/nss_ldap.so

dlopen() of "././nss_ldap-253/nss_ldap.so" failed:

./././nss_ldap-253/nss_ldap.so: undefined symbol: request_key

error: Bad exit status from /var/tmp/rpm-tmp.62652 (%build)

 

The missing libraries have been added, which resolves this issue.

 

When recursively enumerating the set of members in a given group, the

module would allocate insufficient space for storing the set of member

names if the group itself contained other groups, thus corrupting the heap.

This update includes a backported fix for this bug.

 

Users of nss_ldap should upgrade to these updated packages, which contain

backported patches to correct this issue and fix these bugs.

 

 

4. Solution:

 

Before applying this update, make sure that all previously-released

errata relevant to your system have been applied.

 

This update is available via Red Hat Network. Details on how to use

the Red Hat Network to apply this update are available at

http://kbase.redhat.com/faq/FAQ_58_10188

 

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

 

254172 - Automatic DNS discovery of the LDAP server does not work

364501 - pam_ldap tries to change passwords twice

367461 - CVE-2007-5794 nss_ldap randomly replying with wrong user's data

427370 - RHEL 5.1 nss_ldap does not build with RHEL 5.1 krb5 packages

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nss_ldap-253-12.el5.src.rpm

 

i386:

nss_ldap-253-12.el5.i386.rpm

nss_ldap-debuginfo-253-12.el5.i386.rpm

 

x86_64:

nss_ldap-253-12.el5.i386.rpm

nss_ldap-253-12.el5.x86_64.rpm

nss_ldap-debuginfo-253-12.el5.i386.rpm

nss_ldap-debuginfo-253-12.el5.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/nss_ldap-253-12.el5.src.rpm

 

i386:

nss_ldap-253-12.el5.i386.rpm

nss_ldap-debuginfo-253-12.el5.i386.rpm

 

ia64:

nss_ldap-253-12.el5.i386.rpm

nss_ldap-253-12.el5.ia64.rpm

nss_ldap-debuginfo-253-12.el5.i386.rpm

nss_ldap-debuginfo-253-12.el5.ia64.rpm

 

ppc:

nss_ldap-253-12.el5.ppc.rpm

nss_ldap-253-12.el5.ppc64.rpm

nss_ldap-debuginfo-253-12.el5.ppc.rpm

nss_ldap-debuginfo-253-12.el5.ppc64.rpm

 

s390x:

nss_ldap-253-12.el5.s390.rpm

nss_ldap-253-12.el5.s390x.rpm

nss_ldap-debuginfo-253-12.el5.s390.rpm

nss_ldap-debuginfo-253-12.el5.s390x.rpm

 

x86_64:

nss_ldap-253-12.el5.i386.rpm

nss_ldap-253-12.el5.x86_64.rpm

nss_ldap-debuginfo-253-12.el5.i386.rpm

nss_ldap-debuginfo-253-12.el5.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://www.redhat.com/security/team/key/#package

 

7. References:

 

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5794

http://www.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://www.redhat.com/security/team/contact/

 

Copyright 2008 Red Hat, Inc.

-----BEGIN PGP SIGNATURE-----

Version: GnuPG v1.4.4 (GNU/Linux)

 

iD8DBQFINDI3XlSAg2UNWIIRApZPAJ9Kf+xkClLPFcxM+DsAGRJ81cIT8ACgh419

X1FNfKJ0Jq3S2cGXVoxUr0g=

=86EC

-----END PGP SIGNATURE-----

 

 

--