RHSA-2009:1585-01 Moderate: samba3x security and bug fix update
Posted on: 11/16/2009 06:05 PM

A new update is available for Red Hat Enterprise Linux. Here the announcement:

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Red Hat Security Advisory

Synopsis: Moderate: samba3x security and bug fix update
Advisory ID: RHSA-2009:1585-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1585.html
Issue date: 2009-11-16
CVE Names: CVE-2009-1888 CVE-2009-2813 CVE-2009-2906
CVE-2009-2948
=====================================================================

1. Summary:

Updated samba3x packages that fix multiple security issues and various bugs
are now available for Red Hat Enterprise Linux 5 Supplementary.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

RHEL Desktop Supplementary (v. 5 client) - x86_64
RHEL Supplementary (v. 5 server) - x86_64

3. Description:

Samba is a suite of programs used by machines to share files, printers, and
other information. These samba3x packages provide Samba 3.3, which is a
Technology Preview for Red Hat Enterprise Linux 5. These packages cannot be
installed in parallel with the samba packages. Note: Technology Previews
are not intended for production use.

A denial of service flaw was found in the Samba smbd daemon. An
authenticated, remote user could send a specially-crafted response that
would cause an smbd child process to enter an infinite loop. An
authenticated, remote user could use this flaw to exhaust system resources
by opening multiple CIFS sessions. (CVE-2009-2906)

An uninitialized data access flaw was discovered in the smbd daemon when
using the non-default "dos filemode" configuration option in "smb.conf". An
authenticated, remote user with write access to a file could possibly use
this flaw to change an access control list for that file, even when such
access should have been denied. (CVE-2009-1888)

A flaw was discovered in the way Samba handled users without a home
directory set in the back-end password database (e.g. "/etc/passwd"). If a
share for the home directory of such a user was created (e.g. using the
automated "[homes]" share), any user able to access that share could see
the whole file system, possibly bypassing intended access restrictions.
(CVE-2009-2813)

The mount.cifs program printed CIFS passwords as part of its debug output
when running in verbose mode. When mount.cifs had the setuid bit set, a
local, unprivileged user could use this flaw to disclose passwords from a
file that would otherwise be inaccessible to that user. Note: mount.cifs
from the samba3x packages distributed by Red Hat does not have the setuid
bit set. This flaw only affected systems where the setuid bit was manually
set by an administrator. (CVE-2009-2948)

This update also fixes the following bugs:

* the samba3x packages contained missing and conflicting license
information. License information was missing for the libtalloc, libtdb, and
tdb-tools packages. The samba3x-common package provided a COPYING file;
however, it stated the license was GPLv2, while RPM metadata stated the
licenses were either GPLv3 or LGPLv3. This update adds the correct
licensing information to the samba3x-common, libsmbclient, libtalloc,
libtdb, and tdb-tools packages. (BZ#528633)

* the upstream Samba version in the samba3x packages distributed with the
RHEA-2009:1399 update contained broken implementations of the Netlogon
credential chain and SAMR access checks security subsystems. This prevented
Samba from acting as a domain controller: Client systems could not join the
domain; users could not authenticate; and systems could not access the user
and group list. (BZ#524551)

* this update resolves interoperability issues with Windows 7 and Windows
Server 2008 R2. (BZ#529022)

These packages upgrade Samba from version 3.3.5 to version 3.3.8. Refer to
the Samba Release Notes for a list of changes between versions:
http://samba.org/samba/history/

Users of samba3x should upgrade to these updated packages, which resolve
these issues. After installing this update, the smb service will be
restarted automatically.

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/docs/DOC-11259

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

506996 - CVE-2009-1888 Samba improper file access
523752 - CVE-2009-2813 Samba: Share restriction bypass via home-less directory user account(s)
524551 - samba3x 3.3.4 is broken as domain controller
526074 - CVE-2009-2948 samba: information disclosure in suid mount.cifs
526645 - CVE-2009-2906 samba: infinite loop flaw in smbd on unexpected oplock break notification reply
528633 - License problem for Samba3X in x86_64 supplementary image
529022 - Interoperation with Windows 7 and Windows 2008 (R2) broken

6. Package List:

RHEL Desktop Supplementary (v. 5 client):

Source:
samba3x-3.3.8-0.46.el5.src.rpm

x86_64:
libsmbclient-3.0.34-46.el5.x86_64.rpm
libsmbclient-devel-3.0.34-46.el5.x86_64.rpm
libtalloc-1.2.0-46.el5.x86_64.rpm
libtalloc-devel-1.2.0-46.el5.x86_64.rpm
libtdb-1.1.2-46.el5.x86_64.rpm
libtdb-devel-1.1.2-46.el5.x86_64.rpm
samba3x-3.3.8-0.46.el5.x86_64.rpm
samba3x-client-3.3.8-0.46.el5.x86_64.rpm
samba3x-common-3.3.8-0.46.el5.x86_64.rpm
samba3x-debuginfo-3.3.8-0.46.el5.x86_64.rpm
samba3x-doc-3.3.8-0.46.el5.x86_64.rpm
samba3x-domainjoin-gui-3.3.8-0.46.el5.x86_64.rpm
samba3x-swat-3.3.8-0.46.el5.x86_64.rpm
samba3x-winbind-3.3.8-0.46.el5.x86_64.rpm
samba3x-winbind-devel-3.3.8-0.46.el5.x86_64.rpm
tdb-tools-1.1.2-46.el5.x86_64.rpm

RHEL Supplementary (v. 5 server):

Source:
samba3x-3.3.8-0.46.el5.src.rpm

x86_64:
libsmbclient-3.0.34-46.el5.x86_64.rpm
libsmbclient-devel-3.0.34-46.el5.x86_64.rpm
libtalloc-1.2.0-46.el5.x86_64.rpm
libtalloc-devel-1.2.0-46.el5.x86_64.rpm
libtdb-1.1.2-46.el5.x86_64.rpm
libtdb-devel-1.1.2-46.el5.x86_64.rpm
samba3x-3.3.8-0.46.el5.x86_64.rpm
samba3x-client-3.3.8-0.46.el5.x86_64.rpm
samba3x-common-3.3.8-0.46.el5.x86_64.rpm
samba3x-debuginfo-3.3.8-0.46.el5.x86_64.rpm
samba3x-doc-3.3.8-0.46.el5.x86_64.rpm
samba3x-domainjoin-gui-3.3.8-0.46.el5.x86_64.rpm
samba3x-swat-3.3.8-0.46.el5.x86_64.rpm
samba3x-winbind-3.3.8-0.46.el5.x86_64.rpm
samba3x-winbind-devel-3.3.8-0.46.el5.x86_64.rpm
tdb-tools-1.1.2-46.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-2009-1888
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2813
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2906
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2948
http://www.redhat.com/security/updates/classification/#moderate
http://www.redhat.com/support/policy/soc/production/preview_scope/
http://samba.org/samba/history/

8. Contact:

The Red Hat security contact is lt;secalert@redhat.comgt;. More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.
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