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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba smbd Named Pipe Validation Flaw Lets Remote Authenticated Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1038555
SecurityTracker URL:  http://securitytracker.com/id/1038555
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  
Version(s): 3.5.0 and after
Description:   A vulnerability was reported in Samba. A remote authenticated user can execute arbitrary code on the target system.

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 samba4.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:1271

Vendor URL:  access.redhat.com/errata/RHSA-2017:1271 (Links to External Site)
Cause:   Input validation 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.
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-2017:1271-01] Important: samba4 security update

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

Synopsis:          Important: samba4 security update
Advisory ID:       RHSA-2017:1271-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1271
Issue date:        2017-05-24
CVE Names:         CVE-2017-7494 
=====================================================================

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 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 Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-10.el6_9.src.rpm

i386:
samba4-4.2.10-10.el6_9.i686.rpm
samba4-client-4.2.10-10.el6_9.i686.rpm
samba4-common-4.2.10-10.el6_9.i686.rpm
samba4-dc-4.2.10-10.el6_9.i686.rpm
samba4-dc-libs-4.2.10-10.el6_9.i686.rpm
samba4-debuginfo-4.2.10-10.el6_9.i686.rpm
samba4-devel-4.2.10-10.el6_9.i686.rpm
samba4-libs-4.2.10-10.el6_9.i686.rpm
samba4-pidl-4.2.10-10.el6_9.i686.rpm
samba4-python-4.2.10-10.el6_9.i686.rpm
samba4-test-4.2.10-10.el6_9.i686.rpm
samba4-winbind-4.2.10-10.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-10.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.i686.rpm

x86_64:
samba4-4.2.10-10.el6_9.x86_64.rpm
samba4-client-4.2.10-10.el6_9.x86_64.rpm
samba4-common-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-10.el6_9.x86_64.rpm
samba4-devel-4.2.10-10.el6_9.x86_64.rpm
samba4-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-pidl-4.2.10-10.el6_9.x86_64.rpm
samba4-python-4.2.10-10.el6_9.x86_64.rpm
samba4-test-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.x86_64.rpm

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

Source:
samba4-4.2.10-10.el6_9.src.rpm

x86_64:
samba4-4.2.10-10.el6_9.x86_64.rpm
samba4-client-4.2.10-10.el6_9.x86_64.rpm
samba4-common-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-10.el6_9.x86_64.rpm
samba4-devel-4.2.10-10.el6_9.x86_64.rpm
samba4-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-pidl-4.2.10-10.el6_9.x86_64.rpm
samba4-python-4.2.10-10.el6_9.x86_64.rpm
samba4-test-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-10.el6_9.src.rpm

i386:
samba4-4.2.10-10.el6_9.i686.rpm
samba4-client-4.2.10-10.el6_9.i686.rpm
samba4-common-4.2.10-10.el6_9.i686.rpm
samba4-dc-4.2.10-10.el6_9.i686.rpm
samba4-dc-libs-4.2.10-10.el6_9.i686.rpm
samba4-debuginfo-4.2.10-10.el6_9.i686.rpm
samba4-devel-4.2.10-10.el6_9.i686.rpm
samba4-libs-4.2.10-10.el6_9.i686.rpm
samba4-pidl-4.2.10-10.el6_9.i686.rpm
samba4-python-4.2.10-10.el6_9.i686.rpm
samba4-test-4.2.10-10.el6_9.i686.rpm
samba4-winbind-4.2.10-10.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-10.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.i686.rpm

ppc64:
samba4-4.2.10-10.el6_9.ppc64.rpm
samba4-client-4.2.10-10.el6_9.ppc64.rpm
samba4-common-4.2.10-10.el6_9.ppc64.rpm
samba4-dc-4.2.10-10.el6_9.ppc64.rpm
samba4-dc-libs-4.2.10-10.el6_9.ppc64.rpm
samba4-debuginfo-4.2.10-10.el6_9.ppc64.rpm
samba4-devel-4.2.10-10.el6_9.ppc64.rpm
samba4-libs-4.2.10-10.el6_9.ppc64.rpm
samba4-pidl-4.2.10-10.el6_9.ppc64.rpm
samba4-python-4.2.10-10.el6_9.ppc64.rpm
samba4-test-4.2.10-10.el6_9.ppc64.rpm
samba4-winbind-4.2.10-10.el6_9.ppc64.rpm
samba4-winbind-clients-4.2.10-10.el6_9.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.ppc64.rpm

s390x:
samba4-4.2.10-10.el6_9.s390x.rpm
samba4-client-4.2.10-10.el6_9.s390x.rpm
samba4-common-4.2.10-10.el6_9.s390x.rpm
samba4-dc-4.2.10-10.el6_9.s390x.rpm
samba4-dc-libs-4.2.10-10.el6_9.s390x.rpm
samba4-debuginfo-4.2.10-10.el6_9.s390x.rpm
samba4-devel-4.2.10-10.el6_9.s390x.rpm
samba4-libs-4.2.10-10.el6_9.s390x.rpm
samba4-pidl-4.2.10-10.el6_9.s390x.rpm
samba4-python-4.2.10-10.el6_9.s390x.rpm
samba4-test-4.2.10-10.el6_9.s390x.rpm
samba4-winbind-4.2.10-10.el6_9.s390x.rpm
samba4-winbind-clients-4.2.10-10.el6_9.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.s390x.rpm

x86_64:
samba4-4.2.10-10.el6_9.x86_64.rpm
samba4-client-4.2.10-10.el6_9.x86_64.rpm
samba4-common-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-10.el6_9.x86_64.rpm
samba4-devel-4.2.10-10.el6_9.x86_64.rpm
samba4-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-pidl-4.2.10-10.el6_9.x86_64.rpm
samba4-python-4.2.10-10.el6_9.x86_64.rpm
samba4-test-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-10.el6_9.src.rpm

i386:
samba4-4.2.10-10.el6_9.i686.rpm
samba4-client-4.2.10-10.el6_9.i686.rpm
samba4-common-4.2.10-10.el6_9.i686.rpm
samba4-dc-4.2.10-10.el6_9.i686.rpm
samba4-dc-libs-4.2.10-10.el6_9.i686.rpm
samba4-debuginfo-4.2.10-10.el6_9.i686.rpm
samba4-devel-4.2.10-10.el6_9.i686.rpm
samba4-libs-4.2.10-10.el6_9.i686.rpm
samba4-pidl-4.2.10-10.el6_9.i686.rpm
samba4-python-4.2.10-10.el6_9.i686.rpm
samba4-test-4.2.10-10.el6_9.i686.rpm
samba4-winbind-4.2.10-10.el6_9.i686.rpm
samba4-winbind-clients-4.2.10-10.el6_9.i686.rpm
samba4-winbind-krb5-locator-4.2.10-10.el6_9.i686.rpm

x86_64:
samba4-4.2.10-10.el6_9.x86_64.rpm
samba4-client-4.2.10-10.el6_9.x86_64.rpm
samba4-common-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-4.2.10-10.el6_9.x86_64.rpm
samba4-dc-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-debuginfo-4.2.10-10.el6_9.x86_64.rpm
samba4-devel-4.2.10-10.el6_9.x86_64.rpm
samba4-libs-4.2.10-10.el6_9.x86_64.rpm
samba4-pidl-4.2.10-10.el6_9.x86_64.rpm
samba4-python-4.2.10-10.el6_9.x86_64.rpm
samba4-test-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-clients-4.2.10-10.el6_9.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-10.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-2017-7494
https://access.redhat.com/security/updates/classification/#important
https://www.samba.org/samba/security/CVE-2017-7494.html
https://access.redhat.com/security/vulnerabilities/3034621

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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