Synopsis

Low: nss_ldap security and bug fix update

Type/Severity

Security Advisory: Low

Topic

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.

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 that make LDAP connections, such as Dovecot. This could cause
nss_ldap to answer a request for information about one user with the
information about a different user. (CVE-2007-5794)

As well, this updated package fixes the following bugs:

• in certain situations, on Itanium(R) architectures, when an application
  performed an LDAP lookup for a highly populated group, for example,
  containing more than 150 members, the application crashed, or may have
  caused a segmentation fault. As well, this issue may have caused commands,
  such as "ls", to return a "ber_free_buf: Assertion" error.
  
• when an application enumerated members of a netgroup, the nss_ldap
  module returned a successful status result and the netgroup name, even
  when the netgroup did not exist. This behavior was not consistent with
  other modules. In this updated package, nss_ldap no longer returns a
  successful status when the netgroup does not exist.
  
• in master and slave server environments, with systems that were
  configured to use a read-only directory server, if user log in attempts
  were denied because their passwords had expired, and users attempted to
  immediately change their passwords, the replication server returned an LDAP
  referral, instructing the pam_ldap module to resissue its request to a
  different server; however, the pam_ldap module failed to do so. In these
  situations, an error such as the following occurred:
  

LDAP password information update failed: Can't contact LDAP server
Insufficient 'write' privilege to the 'userPassword' attribute of entry
[entry]

In this updated package, password changes are allowed when binding against
a slave server, which resolves this issue.

• when a system used a directory server for naming information, and
  "nss_initgroups_ignoreusers root" was configured in "/etc/ldap.conf",
  dbus-daemon-1 would hang. Running the "service messagebus start" command
  did not start the service, and it did not fail, which would stop the boot
  process if it was not cancelled.
  

As well, this updated package upgrades nss_ldap to the version as shipped
with Red Hat Enterprise Linux 5.

Users of nss_ldap are advised to upgrade to this updated package, which
resolves these issues.

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

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 155187 - CVE-2007-5794 nss_ldap randomly replying with wrong user's data [rhel-4.7]
• BZ - 233382 - nss_ldap crashes on large groups (IA64)
• BZ - 253997 - nss_ldap / setnetgrent() returns always 1 despite not retrieving any valid results.
• BZ - 367461 - CVE-2007-5794 nss_ldap randomly replying with wrong user's data
• BZ - 401731 - Rebase nss_ldap to RHEL 5.2 version
• BZ - 429101 - dbus-daemon-1 hangs when using the option nss_initgroups_ignoreusers in /etc/ldap.conf with the user root

CVEs

• CVE-2007-5794

References

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

Red Hat Enterprise Linux Server 4

SRPM
nss_ldap-253-5.el4.src.rpm	SHA-256: a6e98abade0a8a21f917bb5be4ec308de666421768e8bcabf0c45cb90d917eff
x86_64
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.x86_64.rpm	SHA-256: 1fabca824ef513f11fd6a764455a721cda08590c7a3dbeb25ba20a42b4a81f8d
nss_ldap-253-5.el4.x86_64.rpm	SHA-256: 1fabca824ef513f11fd6a764455a721cda08590c7a3dbeb25ba20a42b4a81f8d
ia64
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.ia64.rpm	SHA-256: bf367983d875c1f1fe9cadf0f8c59d408d5caf62abc35b38d51a1fba45ba4d7f
nss_ldap-253-5.el4.ia64.rpm	SHA-256: bf367983d875c1f1fe9cadf0f8c59d408d5caf62abc35b38d51a1fba45ba4d7f
i386
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8

Red Hat Enterprise Linux Workstation 4

SRPM
nss_ldap-253-5.el4.src.rpm	SHA-256: a6e98abade0a8a21f917bb5be4ec308de666421768e8bcabf0c45cb90d917eff
x86_64
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.x86_64.rpm	SHA-256: 1fabca824ef513f11fd6a764455a721cda08590c7a3dbeb25ba20a42b4a81f8d
ia64
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.ia64.rpm	SHA-256: bf367983d875c1f1fe9cadf0f8c59d408d5caf62abc35b38d51a1fba45ba4d7f
i386
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8

Red Hat Enterprise Linux Desktop 4

SRPM
nss_ldap-253-5.el4.src.rpm	SHA-256: a6e98abade0a8a21f917bb5be4ec308de666421768e8bcabf0c45cb90d917eff
x86_64
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8
nss_ldap-253-5.el4.x86_64.rpm	SHA-256: 1fabca824ef513f11fd6a764455a721cda08590c7a3dbeb25ba20a42b4a81f8d
i386
nss_ldap-253-5.el4.i386.rpm	SHA-256: 188ac02beb075d3cbdbcf12152abd525de984a4e879b32b588f54c63ad0aa3c8

Red Hat Enterprise Linux for IBM z Systems 4

SRPM
nss_ldap-253-5.el4.src.rpm	SHA-256: a6e98abade0a8a21f917bb5be4ec308de666421768e8bcabf0c45cb90d917eff
s390x
nss_ldap-253-5.el4.s390.rpm	SHA-256: 73b7035fd5673c3482fb67037ad48d451be7a9e22b12188db01a9391ad7bc434
nss_ldap-253-5.el4.s390x.rpm	SHA-256: 92cb7d52aeff1f9c97cc7b755c635b3aac64d5fda888fd7daa3752ed8cc412e0
s390
nss_ldap-253-5.el4.s390.rpm	SHA-256: 73b7035fd5673c3482fb67037ad48d451be7a9e22b12188db01a9391ad7bc434

Red Hat Enterprise Linux for Power, big endian 4

SRPM
nss_ldap-253-5.el4.src.rpm	SHA-256: a6e98abade0a8a21f917bb5be4ec308de666421768e8bcabf0c45cb90d917eff
ppc
nss_ldap-253-5.el4.ppc.rpm	SHA-256: 6097ec6107163049b480b4f1a6229aa61d67c49cf1bee669a8123129a0c84d88
nss_ldap-253-5.el4.ppc64.rpm	SHA-256: 85bc37ecef63b63f518dd83bff1646aa9a1dc49893640e1059386595546a58c0