(Red Hat Issues Revised Fix for Red Hat Gluster Storage) Samba Multiple Flaws Let Remote Users Hijack Connections and Remote Authenticated Users Obtain Potentially Sensitive Information
SecurityTracker Alert ID: 1039501|
SecurityTracker URL: http://securitytracker.com/id/1039501
CVE-2017-12150, CVE-2017-12151, CVE-2017-12163, CVE-2017-15085, CVE-2017-15086, CVE-2017-15087
(Links to External Site)
Updated: Nov 3 2017|
Original Entry Date: Oct 4 2017
Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information|
Fix Available: Yes Vendor Confirmed: Yes |
Several vulnerabilities were reported in Samba. A remote user can access data on the target system. A remote user can modify data on the target system. A remote authenticated user can obtain potentially sensitive information on the target system. Red Hat Gluster Storage is affected.|
The system fails to require SMB signing in certain cases. A remote user can conduct a man-in-the-middle attack to hijack client connections and obtain potentially sensitive information [CVE-2017-12150]. Versions 3.0.25 to 4.6.7 are affected.
The client software does not properly sign and encrypt DFS redirects when the max protocol for the original connection is set as 'SMB3' [CVE-2017-12151]. Versions 4.1.0 to 4.6.7 are affected.
A remote authenticated user can send specially crafted SMB1 data to cause portions of server memory contents to be written to a file on the target Samba share or to a shared printer [CVE-2017-12163].
Yihan Lian and Zhibin Hu, security researchers with Qihoo 360 GearTeam, and Stefan Metzmacher of SerNet (https://samba.plus) reported these vulnerabilities.
A remote user can access and modify data communicated between the client and server.|
A remote authenticated user can obtain potentially sensitive information from server memory on the target system.
The original Red Hat fix for Red Hat Gluster Storage described in Red Hat advisory RHSA-2017:2858 was incomplete. CVE numbers CVE-2017-15085, CVE-2017-15086, and CVE-2017-15087 have been assigned to the incomplete fix.|
Red Hat has issued a revised fix for Red Hat Gluster Storage [see Red Hat Advisory RHSA-2017:3110].
The Red Hat advisories are available at:
Vendor URL: access.redhat.com/errata/RHSA-2017:3110 (Links to External Site)
Access control error, Authentication error|
|Underlying OS: Linux (Red Hat Enterprise)|
|Underlying OS Comments: 6|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2017:2858-01] Moderate: samba security update|
-----BEGIN PGP SIGNED MESSAGE-----
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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
-----END PGP SIGNATURE-----
RHSA-announce mailing list