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Category:   Application (File Transfer/Sharing)  >   Red Hat Gluster Storage Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Gluster Storage) Samba Input Validation Flaw Lets Remote Users Cause the Target Print Spooler Service to Crash
SecurityTracker Alert ID:  1041596
SecurityTracker URL:  http://securitytracker.com/id/1041596
CVE Reference:   CVE-2018-1050   (Links to External Site)
Date:  Sep 4 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Samba. A remote user can cause the target print spooler service to crash. Red Hat Gluster Storage is affected.

A remote user can send specially crafted RPC calls to the 'spoolss' service to trigger a null pointer error and cause the target print spooler service to crash.

Systems configured with the the 'spoolss' service as an external daemon are affected.

Impact:   A remote user can cause the target print spooler service to crash.
Solution:   Red Hat has issued a fix for Red Hat Gluster Storage.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:2612

Vendor URL:  access.redhat.com/errata/RHSA-2018:2612 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 13 2018 Samba Input Validation Flaw Lets Remote Users Cause the Target Print Spooler Service to Crash



 Source Message Contents

Subject:  [RHSA-2018:2612-01] Moderate: samba security, bug fix and enhancement update

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

Synopsis:          Moderate: samba security, bug fix and enhancement update
Advisory ID:       RHSA-2018:2612-01
Product:           Red Hat Gluster Storage
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2612
Issue date:        2018-09-04
CVE Names:         CVE-2018-1050 CVE-2018-1139 CVE-2018-10858 
=====================================================================

1. Summary:

Updated samba packages that fix several security issues and provide several
bug fixes and an enhancement are now available for Red Hat Gluster Storage
3.4 for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Gluster 3.4 Samba on RHEL-6 - noarch, x86_64

3. Description:

Samba is an open-source implementation of the Server Message Block (SMB)
protocol and the related Common Internet File System (CIFS) protocol, which
allow PC-compatible machines to share files, printers, and various
information.

Security Fix(es):

* samba: Weak authentication protocol regression (CVE-2018-1139)

* samba: Insufficient input validation in libsmbclient (CVE-2018-10858)

* samba: Null pointer indirection in printer server process (CVE-2018-1050)

Red Hat would like to thank the Samba project for reporting CVE-2018-1139
and CVE-2018-1050. Upstream acknowledges Vivek Das (Red Hat) as the
original reporter of CVE-2018-1139.

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Bug Fix(es):

* Previously, sharing a subdirectory of a Gluster volume failed with an I/O
error when the shadow_copy2 vfs object was specified. This occurred because
Gluster volumes are remote file systems, and shadow_copy2 only detected
share paths in the local file system. This update forces the value of
shadow:mountpath to '/', skipping the code related to mount point
detection, and preventing this problem. However, this fix requires that the
glusterfs vfs object is listed after the shadow_copy2 vfs object in the
smb.conf file. (BZ#1379444)

* As of Red Hat Gluster Storage 3.4, the libldb package is no longer
shipped as an independent package in the Red Hat Gluster Storage Samba
channel. The capabilities of the libldb package are now provided by a
combination of the samba-client and samba-client-libs packages. In
addition, the sub-packages previously provided by libldb are now provided
by the samba-client and samba-client-libs packages. The samba-client
sub-package provides ldb-tools, and the samba-client-libs sub-package
provides pyldb. (BZ#1592794)

Enhancement(s):

* Red Hat Gluster Storage volumes exported using SMB can now be mounted on
macOS clients using Finder. Configuration instructions are provided as part
of the Red Hat Gluster Storage 3.4 documentation. (BZ#1446125)
Red Hat strongly recommends upgrading to these updated packages.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted
automatically.

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

1511931 - [RHEL6] [Rebase] Samba: Yum update for Samba will fail due to higher versions in RHEL 7.5
1511941 - [RHEL6] [Rebase] Samba rebase requires update to some dependent libraries
1538771 - CVE-2018-1050 samba: Null pointer indirection in printer server process
1589651 - CVE-2018-1139 samba: Weak authentication protocol regression
1612805 - CVE-2018-10858 samba: insufficient input validation in libsmbclient

6. Package List:

Red Hat Gluster 3.4 Samba on RHEL-6:

Source:
libtalloc-2.1.11-1.el6rhs.src.rpm
libtdb-1.3.15-4.el6rhs.src.rpm
libtevent-0.9.35-1.el6rhs.src.rpm
samba-4.7.5-110.el6rhs.src.rpm

noarch:
samba-common-4.7.5-110.el6rhs.noarch.rpm
samba-pidl-4.7.5-110.el6rhs.noarch.rpm

x86_64:
ctdb-4.7.5-110.el6rhs.x86_64.rpm
libsmbclient-4.7.5-110.el6rhs.x86_64.rpm
libsmbclient-devel-4.7.5-110.el6rhs.x86_64.rpm
libtalloc-2.1.11-1.el6rhs.x86_64.rpm
libtalloc-debuginfo-2.1.11-1.el6rhs.x86_64.rpm
libtalloc-devel-2.1.11-1.el6rhs.x86_64.rpm
libtdb-1.3.15-4.el6rhs.x86_64.rpm
libtdb-debuginfo-1.3.15-4.el6rhs.x86_64.rpm
libtdb-devel-1.3.15-4.el6rhs.x86_64.rpm
libtevent-0.9.35-1.el6rhs.x86_64.rpm
libtevent-debuginfo-0.9.35-1.el6rhs.x86_64.rpm
libtevent-devel-0.9.35-1.el6rhs.x86_64.rpm
libwbclient-4.7.5-110.el6rhs.x86_64.rpm
libwbclient-devel-4.7.5-110.el6rhs.x86_64.rpm
pytalloc-2.1.11-1.el6rhs.x86_64.rpm
pytalloc-devel-2.1.11-1.el6rhs.x86_64.rpm
python-tdb-1.3.15-4.el6rhs.x86_64.rpm
python-tevent-0.9.35-1.el6rhs.x86_64.rpm
samba-4.7.5-110.el6rhs.x86_64.rpm
samba-client-4.7.5-110.el6rhs.x86_64.rpm
samba-client-libs-4.7.5-110.el6rhs.x86_64.rpm
samba-common-libs-4.7.5-110.el6rhs.x86_64.rpm
samba-common-tools-4.7.5-110.el6rhs.x86_64.rpm
samba-dc-4.7.5-110.el6rhs.x86_64.rpm
samba-dc-libs-4.7.5-110.el6rhs.x86_64.rpm
samba-debuginfo-4.7.5-110.el6rhs.x86_64.rpm
samba-devel-4.7.5-110.el6rhs.x86_64.rpm
samba-krb5-printing-4.7.5-110.el6rhs.x86_64.rpm
samba-libs-4.7.5-110.el6rhs.x86_64.rpm
samba-python-4.7.5-110.el6rhs.x86_64.rpm
samba-vfs-glusterfs-4.7.5-110.el6rhs.x86_64.rpm
samba-winbind-4.7.5-110.el6rhs.x86_64.rpm
samba-winbind-clients-4.7.5-110.el6rhs.x86_64.rpm
samba-winbind-krb5-locator-4.7.5-110.el6rhs.x86_64.rpm
samba-winbind-modules-4.7.5-110.el6rhs.x86_64.rpm
tdb-tools-1.3.15-4.el6rhs.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-2018-1050
https://access.redhat.com/security/cve/CVE-2018-1139
https://access.redhat.com/security/cve/CVE-2018-10858
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 2018 Red Hat, Inc.
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