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AUSCERT External Security Bulletin Redistribution
Moderate: samba security update
5 October 2017
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2017-12163 CVE-2017-12151 CVE-2017-12150
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Red Hat Security Advisory
Synopsis: Moderate: samba security update
Advisory ID: RHSA-2017:2858-01
Product: Red Hat Gluster Storage
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2858
Issue date: 2017-10-04
CVE Names: CVE-2017-12150 CVE-2017-12151 CVE-2017-12163
An update for samba is now available for Red Hat Gluster Storage 3.3 for
RHEL 6 and Red Hat Gluster Storage 3.3 for RHEL 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.
2. Relevant releases/architectures:
Red Hat Gluster 3.3 Samba on RHEL-6 - noarch, x86_64
Red Hat Gluster 3.3 Samba on RHEL-7 - noarch, x86_64
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
* It was found that samba did not enforce "SMB signing" when certain
configuration options were enabled. A remote attacker could launch a
man-in-the-middle attack and retrieve information in plain-text.
* A flaw was found in the way samba client used encryption with the max
protocol set as SMB3. The connection could lose the requirement for signing
and encrypting to any DFS redirects, allowing an attacker to read or alter
the contents of the connection via a man-in-the-middle attack.
* An information leak flaw was found in the way SMB1 protocol was
implemented by Samba. A malicious client could use this flaw to dump server
memory contents to a file on the samba share or to a shared printer, though
the exact area of server memory cannot be controlled by the attacker.
Red Hat would like to thank the Samba project for reporting CVE-2017-12150
and CVE-2017-12151 and Yihan Lian and Zhibin Hu (Qihoo 360 GearTeam),
Stefan Metzmacher (SerNet), and Jeremy Allison (Google) for reporting
CVE-2017-12163. Upstream acknowledges Stefan Metzmacher (SerNet) as the
original reporter of CVE-2017-12150 and CVE-2017-12151.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
After installing this update, the smb service will be restarted
5. Bugs fixed (https://bugzilla.redhat.com/):
1488197 - CVE-2017-12151 samba: SMB2 connections don't keep encryption across DFS redirects
1488400 - CVE-2017-12150 samba: Some code path don't enforce smb signing, when they should
1491206 - CVE-2017-12163 Samba: Server memory information leak over SMB1
6. Package List:
Red Hat Gluster 3.3 Samba on RHEL-6:
Red Hat Gluster 3.3 Samba on RHEL-7:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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