Synopsis

Moderate: samba security, bug fix and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

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 7.

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.

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.

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.

Affected Products

• Red Hat Gluster Storage Server for On-premise 3 for RHEL 7 x86_64

Fixes

• BZ - 1500295 - [Samba-Mac OS]Multiple core files are generated upon delete operation in a share mount on Mac OS
• BZ - 1505934 - [RHEL7] [Rebase] Samba: Yum update for Samba will fail due to higher versions in RHEL 7.5
• BZ - 1511939 - [RHEL7] [Rebase] Samba rebase requires update to some dependent libraries
• BZ - 1538771 - CVE-2018-1050 samba: Null pointer indirection in printer server process
• BZ - 1547976 - [Samba-Iozone] Iozone stopped working throws fsync error over a gluster-smb share on windows
• BZ - 1566113 - ctdb: Configuration file /usr/lib/systemd/system/ctdb.service is marked executable.
• BZ - 1589651 - CVE-2018-1139 samba: Weak authentication protocol regression
• BZ - 1612805 - CVE-2018-10858 samba: insufficient input validation in libsmbclient
• BZ - 1619108 - [Samba] Unable to create files and directories in the root path of a smb mount in windows client

CVEs

• CVE-2018-1050
• CVE-2018-1139
• CVE-2018-10858

References