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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 smbd Named Pipe Validation Flaw Lets Remote Authenticated Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1038557
SecurityTracker URL:  http://securitytracker.com/id/1038557
CVE Reference:   CVE-2017-7494   (Links to External Site)
Date:  May 24 2017
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Samba. A remote authenticated user can execute arbitrary code on the target system. Red Hat Gluster Storage is affected.

A remote authenticated user can upload a shared library to a writable share and then open a specially named pipe endpoint (containing a '/' character) cause the target system to execute the library with root privileges.

steelo reported this vulnerability.

Impact:   A remote authenticated user with write privileges on the target share can execute arbitrary code with root privileges on the target system.
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-2017:1273

Vendor URL:  access.redhat.com/errata/RHSA-2017:1273 (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.
May 24 2017 Samba smbd Named Pipe Validation Flaw Lets Remote Authenticated Users Execute Arbitrary Code on the Target System



 Source Message Contents

Subject:  [RHSA-2017:1273-01] Important: samba security update

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

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

Synopsis:          Important: samba security update
Advisory ID:       RHSA-2017:1273-01
Product:           Red Hat Gluster Storage
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1273
Issue date:        2017-05-24
CVE Names:         CVE-2017-7494 
=====================================================================

1. Summary:

An update for samba is now available for Red Hat Gluster Storage 3.2 for
RHEL 6 and Red Hat Gluster Storage 3.2 for RHEL 7.

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 Gluster 3.2 Samba on RHEL-6 - noarch, x86_64
Red Hat Gluster 3.2 Samba on RHEL-7 - 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):

* A remote code execution flaw was found in Samba. A malicious
authenticated samba client, having write access to the samba share, could
use this flaw to execute arbitrary code as root. (CVE-2017-7494)

Red Hat would like to thank the Samba project for reporting this issue.
Upstream acknowledges steelo as the original reporter.

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/):

1450347 - CVE-2017-7494 samba: Loading shared modules from any path in the system leading to RCE

6. Package List:

Red Hat Gluster 3.2 Samba on RHEL-6:

Source:
samba-4.4.6-5.el6rhs.src.rpm

noarch:
samba-common-4.4.6-5.el6rhs.noarch.rpm
samba-pidl-4.4.6-5.el6rhs.noarch.rpm

x86_64:
ctdb-4.4.6-5.el6rhs.x86_64.rpm
ctdb-tests-4.4.6-5.el6rhs.x86_64.rpm
libsmbclient-4.4.6-5.el6rhs.x86_64.rpm
libsmbclient-devel-4.4.6-5.el6rhs.x86_64.rpm
libwbclient-4.4.6-5.el6rhs.x86_64.rpm
libwbclient-devel-4.4.6-5.el6rhs.x86_64.rpm
samba-4.4.6-5.el6rhs.x86_64.rpm
samba-client-4.4.6-5.el6rhs.x86_64.rpm
samba-client-libs-4.4.6-5.el6rhs.x86_64.rpm
samba-common-libs-4.4.6-5.el6rhs.x86_64.rpm
samba-common-tools-4.4.6-5.el6rhs.x86_64.rpm
samba-dc-4.4.6-5.el6rhs.x86_64.rpm
samba-dc-libs-4.4.6-5.el6rhs.x86_64.rpm
samba-debuginfo-4.4.6-5.el6rhs.x86_64.rpm
samba-devel-4.4.6-5.el6rhs.x86_64.rpm
samba-krb5-printing-4.4.6-5.el6rhs.x86_64.rpm
samba-libs-4.4.6-5.el6rhs.x86_64.rpm
samba-python-4.4.6-5.el6rhs.x86_64.rpm
samba-test-4.4.6-5.el6rhs.x86_64.rpm
samba-test-libs-4.4.6-5.el6rhs.x86_64.rpm
samba-vfs-glusterfs-4.4.6-5.el6rhs.x86_64.rpm
samba-winbind-4.4.6-5.el6rhs.x86_64.rpm
samba-winbind-clients-4.4.6-5.el6rhs.x86_64.rpm
samba-winbind-krb5-locator-4.4.6-5.el6rhs.x86_64.rpm
samba-winbind-modules-4.4.6-5.el6rhs.x86_64.rpm

Red Hat Gluster 3.2 Samba on RHEL-7:

Source:
samba-4.4.6-5.el7rhgs.src.rpm

noarch:
samba-common-4.4.6-5.el7rhgs.noarch.rpm
samba-pidl-4.4.6-5.el7rhgs.noarch.rpm

x86_64:
ctdb-4.4.6-5.el7rhgs.x86_64.rpm
ctdb-tests-4.4.6-5.el7rhgs.x86_64.rpm
libsmbclient-4.4.6-5.el7rhgs.x86_64.rpm
libsmbclient-devel-4.4.6-5.el7rhgs.x86_64.rpm
libwbclient-4.4.6-5.el7rhgs.x86_64.rpm
libwbclient-devel-4.4.6-5.el7rhgs.x86_64.rpm
samba-4.4.6-5.el7rhgs.x86_64.rpm
samba-client-4.4.6-5.el7rhgs.x86_64.rpm
samba-client-libs-4.4.6-5.el7rhgs.x86_64.rpm
samba-common-libs-4.4.6-5.el7rhgs.x86_64.rpm
samba-common-tools-4.4.6-5.el7rhgs.x86_64.rpm
samba-dc-4.4.6-5.el7rhgs.x86_64.rpm
samba-dc-libs-4.4.6-5.el7rhgs.x86_64.rpm
samba-debuginfo-4.4.6-5.el7rhgs.x86_64.rpm
samba-devel-4.4.6-5.el7rhgs.x86_64.rpm
samba-krb5-printing-4.4.6-5.el7rhgs.x86_64.rpm
samba-libs-4.4.6-5.el7rhgs.x86_64.rpm
samba-python-4.4.6-5.el7rhgs.x86_64.rpm
samba-test-4.4.6-5.el7rhgs.x86_64.rpm
samba-test-libs-4.4.6-5.el7rhgs.x86_64.rpm
samba-vfs-glusterfs-4.4.6-5.el7rhgs.x86_64.rpm
samba-winbind-4.4.6-5.el7rhgs.x86_64.rpm
samba-winbind-clients-4.4.6-5.el7rhgs.x86_64.rpm
samba-winbind-krb5-locator-4.4.6-5.el7rhgs.x86_64.rpm
samba-winbind-modules-4.4.6-5.el7rhgs.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-2017-7494
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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