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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba SMB1 Use-After-Free Memory Error Lets Remote Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1039910
SecurityTracker URL:  http://securitytracker.com/id/1039910
CVE Reference:   CVE-2017-14746   (Links to External Site)
Date:  Nov 30 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.0 and after
Description:   A vulnerability was reported in Samba. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted SMB1 requests to trigger a use-after-free memory error and execute arbitrary code on the target system. The code will run with the privileges of the target service.

Yihan Lian and Zhibin Hu of Qihoo 360 GearTeam reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:3278

Vendor URL:  access.redhat.com/errata/RHSA-2017:3278 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 21 2017 Samba SMB1 Use-After-Free Memory Error Lets Remote Users Execute Arbitrary Code on the Target System



 Source Message Contents

Subject:  [RHSA-2017:3278-01] Important: samba4 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: samba4 security update
Advisory ID:       RHSA-2017:3278-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:3278
Issue date:        2017-11-29
CVE Names:         CVE-2017-14746 CVE-2017-15275 
=====================================================================

1. Summary:

An update for samba4 is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

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

Security Fix(es):

* A use-after-free flaw was found in the way samba servers handled certain
SMB1 requests. An unauthenticated attacker could send specially-crafted
SMB1 requests to cause the server to crash or execute arbitrary code.
(CVE-2017-14746)

* A memory disclosure flaw was found in samba. An attacker could retrieve
parts of server memory, which could contain potentially sensitive data, by
sending specially-crafted requests to the samba server. (CVE-2017-15275)

Red Hat would like to thank the Samba project for reporting these issues.
Upstream acknowledges Yihan Lian and Zhibin Hu (Qihoo 360 GearTeam) as the
original reporter of CVE-2017-14746; and Volker Lendecke (SerNet and the
Samba Team) as the original reporter of CVE-2017-15275.

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/):

1511899 - CVE-2017-14746 samba: Use-after-free in processing SMB1 requests
1512465 - CVE-2017-15275 samba: Server heap-memory disclosure

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-12.el6_9.src.rpm

i386:
samba4-4.2.10-12.el6_9.i686.rpm
samba4-client-4.2.10-12.el6_9.i686.rpm
samba4-common-4.2.10-12.el6_9.i686.rpm
samba4-dc-4.2.10-12.el6_9.i686.rpm
samba4-dc-libs-4.2.10-12.el6_9.i686.rpm
samba4-debuginfo-4.2.10-12.el6_9.i686.rpm
samba4-devel-4.2.10-12.el6_9.i686.rpm
samba4-libs-4.2.10-12.el6_9.i686.rpm
samba4-pidl-4.2.10-12.el6_9.i686.rpm
samba4-python-4.2.10-12.el6_9.i686.rpm
samba4-test-4.2.10-12.el6_9.i686.rpm
samba4-winbind-4.2.10-12.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-12.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.i686.rpm

x86_64:
samba4-4.2.10-12.el6_9.x86_64.rpm
samba4-client-4.2.10-12.el6_9.x86_64.rpm
samba4-common-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-12.el6_9.x86_64.rpm
samba4-devel-4.2.10-12.el6_9.x86_64.rpm
samba4-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-pidl-4.2.10-12.el6_9.x86_64.rpm
samba4-python-4.2.10-12.el6_9.x86_64.rpm
samba4-test-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
samba4-4.2.10-12.el6_9.src.rpm

x86_64:
samba4-4.2.10-12.el6_9.x86_64.rpm
samba4-client-4.2.10-12.el6_9.x86_64.rpm
samba4-common-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-12.el6_9.x86_64.rpm
samba4-devel-4.2.10-12.el6_9.x86_64.rpm
samba4-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-pidl-4.2.10-12.el6_9.x86_64.rpm
samba4-python-4.2.10-12.el6_9.x86_64.rpm
samba4-test-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-12.el6_9.src.rpm

i386:
samba4-4.2.10-12.el6_9.i686.rpm
samba4-client-4.2.10-12.el6_9.i686.rpm
samba4-common-4.2.10-12.el6_9.i686.rpm
samba4-dc-4.2.10-12.el6_9.i686.rpm
samba4-dc-libs-4.2.10-12.el6_9.i686.rpm
samba4-debuginfo-4.2.10-12.el6_9.i686.rpm
samba4-devel-4.2.10-12.el6_9.i686.rpm
samba4-libs-4.2.10-12.el6_9.i686.rpm
samba4-pidl-4.2.10-12.el6_9.i686.rpm
samba4-python-4.2.10-12.el6_9.i686.rpm
samba4-test-4.2.10-12.el6_9.i686.rpm
samba4-winbind-4.2.10-12.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-12.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.i686.rpm

ppc64:
samba4-4.2.10-12.el6_9.ppc64.rpm
samba4-client-4.2.10-12.el6_9.ppc64.rpm
samba4-common-4.2.10-12.el6_9.ppc64.rpm
samba4-dc-4.2.10-12.el6_9.ppc64.rpm
samba4-dc-libs-4.2.10-12.el6_9.ppc64.rpm
samba4-debuginfo-4.2.10-12.el6_9.ppc64.rpm
samba4-devel-4.2.10-12.el6_9.ppc64.rpm
samba4-libs-4.2.10-12.el6_9.ppc64.rpm
samba4-pidl-4.2.10-12.el6_9.ppc64.rpm
samba4-python-4.2.10-12.el6_9.ppc64.rpm
samba4-test-4.2.10-12.el6_9.ppc64.rpm
samba4-winbind-4.2.10-12.el6_9.ppc64.rpm
samba4-winbind-clients-4.2.10-12.el6_9.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.ppc64.rpm

s390x:
samba4-4.2.10-12.el6_9.s390x.rpm
samba4-client-4.2.10-12.el6_9.s390x.rpm
samba4-common-4.2.10-12.el6_9.s390x.rpm
samba4-dc-4.2.10-12.el6_9.s390x.rpm
samba4-dc-libs-4.2.10-12.el6_9.s390x.rpm
samba4-debuginfo-4.2.10-12.el6_9.s390x.rpm
samba4-devel-4.2.10-12.el6_9.s390x.rpm
samba4-libs-4.2.10-12.el6_9.s390x.rpm
samba4-pidl-4.2.10-12.el6_9.s390x.rpm
samba4-python-4.2.10-12.el6_9.s390x.rpm
samba4-test-4.2.10-12.el6_9.s390x.rpm
samba4-winbind-4.2.10-12.el6_9.s390x.rpm
samba4-winbind-clients-4.2.10-12.el6_9.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.s390x.rpm

x86_64:
samba4-4.2.10-12.el6_9.x86_64.rpm
samba4-client-4.2.10-12.el6_9.x86_64.rpm
samba4-common-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-12.el6_9.x86_64.rpm
samba4-devel-4.2.10-12.el6_9.x86_64.rpm
samba4-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-pidl-4.2.10-12.el6_9.x86_64.rpm
samba4-python-4.2.10-12.el6_9.x86_64.rpm
samba4-test-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-12.el6_9.src.rpm

i386:
samba4-4.2.10-12.el6_9.i686.rpm
samba4-client-4.2.10-12.el6_9.i686.rpm
samba4-common-4.2.10-12.el6_9.i686.rpm
samba4-dc-4.2.10-12.el6_9.i686.rpm
samba4-dc-libs-4.2.10-12.el6_9.i686.rpm
samba4-debuginfo-4.2.10-12.el6_9.i686.rpm
samba4-devel-4.2.10-12.el6_9.i686.rpm
samba4-libs-4.2.10-12.el6_9.i686.rpm
samba4-pidl-4.2.10-12.el6_9.i686.rpm
samba4-python-4.2.10-12.el6_9.i686.rpm
samba4-test-4.2.10-12.el6_9.i686.rpm
samba4-winbind-4.2.10-12.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-12.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.i686.rpm

x86_64:
samba4-4.2.10-12.el6_9.x86_64.rpm
samba4-client-4.2.10-12.el6_9.x86_64.rpm
samba4-common-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-4.2.10-12.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-12.el6_9.x86_64.rpm
samba4-devel-4.2.10-12.el6_9.x86_64.rpm
samba4-libs-4.2.10-12.el6_9.x86_64.rpm
samba4-pidl-4.2.10-12.el6_9.x86_64.rpm
samba4-python-4.2.10-12.el6_9.x86_64.rpm
samba4-test-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-12.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-12.el6_9.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-2017-14746
https://access.redhat.com/security/cve/CVE-2017-15275
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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