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Red Hat Product Errata RHBA-2012:0268 - Bug Fix Advisory
Issued:
2012-02-20
Updated:
2012-02-20

RHBA-2012:0268 - Bug Fix Advisory

  • Overview
  • Updated Packages

Synopsis

nss_ldap bug fix and enhancement update

Type/Severity

Bug Fix Advisory

Topic

An enhanced nss_ldap package that fixes various bugs and provides an enhancement
is now available for Red Hat Enterprise Linux 5.

Description

The nss_ldap package contains the nss_ldap and pam_ldap modules. The nss_ldap
module is a name service switch module which allows applications to retrieve
information about users and groups from a directory server. The pam_ldap module
allows a directory server to be used by PAM-aware applications to verify user
passwords.

This updated nss_ldap package includes fixes for the following bugs:

  • Previously, nss_ldap did not correctly handle the situation where "unreadable"
    files were present in the CA certificate directory. Consequently, nss_ldap
    failed when resolving usernames and groups while using TLS even if a valid
    readable certificate was available. This update corrects the problem and
    nss_ldap now ignores files that are not world readable and uses the readable
    certificate files as expected. (BZ#593242)
  • In certain cases, nss_ldap failed to get a response from the Lightweight
    Directory Access Protocol (LDAP) server and the client became temporarily unable
    to query the server. This update applies a patch which improves the code and the
    server now responds as expected. (BZ#696707)
  • The LDAP server stored its configuration in a fixed-size buffer that could
    have been exceeded with large configurations, thus causing nss_ldap to fail.
    This was especially likely to occur on 64-bit architectures where pointers to
    internal data structures occupy twice as much space in the buffer as on 32-bit
    architectures. This caused situations where a certain ldap configuration worked
    on 32-bit architecture but not on 64-bit architecture. With this update, the
    code has been modified to allow the use of larger ldap configurations without
    exceeding the buffer and nss_ldap now works correctly. (BZ#705841)

In addition, this updated nss_ldap package provides the following enhancement:

  • Prior to this update, nss_ldap did not select the closest DNS records, but
    always selected the first record returned by DNS. This update changes the
    behavior to select the records based on the priority and weight fields.
    (BZ#741419)

All users of nss_ldap are advised to upgrade to this updated package, which
fixes these bugs and provides this enhancement.

Solution

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

  • Red Hat Enterprise Linux Server 5 x86_64
  • Red Hat Enterprise Linux Server 5 ia64
  • Red Hat Enterprise Linux Server 5 i386
  • Red Hat Enterprise Linux Workstation 5 x86_64
  • Red Hat Enterprise Linux Workstation 5 i386
  • Red Hat Enterprise Linux Desktop 5 x86_64
  • Red Hat Enterprise Linux Desktop 5 i386
  • Red Hat Enterprise Linux for IBM z Systems 5 s390x
  • Red Hat Enterprise Linux for Power, big endian 5 ppc
  • Red Hat Enterprise Linux Server from RHUI 5 x86_64
  • Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

  • BZ - 593242 - nss_ldap does not handle "unreadable" certificate files when resolving usernames and groups and using TLS.
  • BZ - 696707 - nss_ldap client does not seem to get a response from ldap server
  • BZ - 756783 - nss_ldap segfaults because of memory corruption

CVEs

(none)

References

(none)

Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
x86_64
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b
nss_ldap-253-49.el5.x86_64.rpm SHA-256: a6714954d7b88c1c5890ee2fa3739e90cab15fc9247b2155dcff280451399875
ia64
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b
nss_ldap-253-49.el5.ia64.rpm SHA-256: 2e5d6089de2fec1c278f572f79fdd5b3458a21987b34a8278172d36631ae9a03
i386
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b

Red Hat Enterprise Linux Workstation 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
x86_64
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b
nss_ldap-253-49.el5.x86_64.rpm SHA-256: a6714954d7b88c1c5890ee2fa3739e90cab15fc9247b2155dcff280451399875
i386
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b

Red Hat Enterprise Linux Desktop 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
x86_64
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b
nss_ldap-253-49.el5.x86_64.rpm SHA-256: a6714954d7b88c1c5890ee2fa3739e90cab15fc9247b2155dcff280451399875
i386
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
s390x
nss_ldap-253-49.el5.s390.rpm SHA-256: b0e0e77ff3ec7aeec5a94707a44b5cdef08aae7ec6af6c0e5417356fdbfac23e
nss_ldap-253-49.el5.s390x.rpm SHA-256: c89781930605a2b7ae6f8ee02ea2b951f17b08d75a7e1ca8ce286571520a4be7

Red Hat Enterprise Linux for Power, big endian 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
ppc
nss_ldap-253-49.el5.ppc.rpm SHA-256: f209b13aa698b19451b0d7766dd088ba8b96fd07297fdedd094f671064762aac
nss_ldap-253-49.el5.ppc64.rpm SHA-256: 884ae8015e55706d22018f96d90e8e9e7424c55b32bde96f7571c83876e10d55

Red Hat Enterprise Linux Server from RHUI 5

SRPM
nss_ldap-253-49.el5.src.rpm SHA-256: 7ce6035abb56643e76d309b3a21921eea6f7b775750d60b1845bf1547ce29744
x86_64
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b
nss_ldap-253-49.el5.x86_64.rpm SHA-256: a6714954d7b88c1c5890ee2fa3739e90cab15fc9247b2155dcff280451399875
i386
nss_ldap-253-49.el5.i386.rpm SHA-256: f6d919f55c79a750ec3c490ea6ca3555087c40ffc5ded1d78bfbd02b7d0cb66b

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

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