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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba Input Validation Flaw Lets Remote Users Cause the Target Print Spooler Service to Crash
SecurityTracker Alert ID:  1041153
SecurityTracker URL:  http://securitytracker.com/id/1041153
CVE Reference:   CVE-2018-1050   (Links to External Site)
Date:  Jun 20 2018
Impact:   Denial of service 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 cause the target print spooler service to crash.

A remote user can send specially crafted RPC calls to the 'spoolss' service to trigger a null pointer error and cause the target print spooler service to crash.

Systems configured with the the 'spoolss' service as an external daemon are affected.

Impact:   A remote user can cause the target print spooler service to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:1883

Vendor URL:  access.redhat.com/errata/RHSA-2018:1883 (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.
Mar 13 2018 Samba Input Validation Flaw Lets Remote Users Cause the Target Print Spooler Service to Crash



 Source Message Contents

Subject:  [RHSA-2018:1883-01] Low: samba4 security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

Synopsis:          Low: samba4 security and bug fix update
Advisory ID:       RHSA-2018:1883-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1883
Issue date:        2018-06-19
CVE Names:         CVE-2018-1050 
=====================================================================

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 Low. 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):

* samba: Null pointer indirection in printer server process (CVE-2018-1050)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank the Samba project for reporting this issue.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10
Technical Notes linked from the References section.

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/):

1492780 - samba4: Recompile without BIND_NOW due to IFUNC relocation issue on ppc64
1538771 - CVE-2018-1050 samba: Null pointer indirection in printer server process

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.2.10-15.el6.src.rpm

i386:
samba4-4.2.10-15.el6.i686.rpm
samba4-client-4.2.10-15.el6.i686.rpm
samba4-common-4.2.10-15.el6.i686.rpm
samba4-dc-4.2.10-15.el6.i686.rpm
samba4-dc-libs-4.2.10-15.el6.i686.rpm
samba4-debuginfo-4.2.10-15.el6.i686.rpm
samba4-devel-4.2.10-15.el6.i686.rpm
samba4-libs-4.2.10-15.el6.i686.rpm
samba4-pidl-4.2.10-15.el6.i686.rpm
samba4-python-4.2.10-15.el6.i686.rpm
samba4-test-4.2.10-15.el6.i686.rpm
samba4-winbind-4.2.10-15.el6.i686.rpm
samba4-winbind-clients-4.2.10-15.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.i686.rpm

x86_64:
samba4-4.2.10-15.el6.x86_64.rpm
samba4-client-4.2.10-15.el6.x86_64.rpm
samba4-common-4.2.10-15.el6.x86_64.rpm
samba4-dc-4.2.10-15.el6.x86_64.rpm
samba4-dc-libs-4.2.10-15.el6.x86_64.rpm
samba4-debuginfo-4.2.10-15.el6.x86_64.rpm
samba4-devel-4.2.10-15.el6.x86_64.rpm
samba4-libs-4.2.10-15.el6.x86_64.rpm
samba4-pidl-4.2.10-15.el6.x86_64.rpm
samba4-python-4.2.10-15.el6.x86_64.rpm
samba4-test-4.2.10-15.el6.x86_64.rpm
samba4-winbind-4.2.10-15.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-15.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.x86_64.rpm

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

Source:
samba4-4.2.10-15.el6.src.rpm

x86_64:
samba4-4.2.10-15.el6.x86_64.rpm
samba4-client-4.2.10-15.el6.x86_64.rpm
samba4-common-4.2.10-15.el6.x86_64.rpm
samba4-dc-4.2.10-15.el6.x86_64.rpm
samba4-dc-libs-4.2.10-15.el6.x86_64.rpm
samba4-debuginfo-4.2.10-15.el6.x86_64.rpm
samba4-devel-4.2.10-15.el6.x86_64.rpm
samba4-libs-4.2.10-15.el6.x86_64.rpm
samba4-pidl-4.2.10-15.el6.x86_64.rpm
samba4-python-4.2.10-15.el6.x86_64.rpm
samba4-test-4.2.10-15.el6.x86_64.rpm
samba4-winbind-4.2.10-15.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-15.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.2.10-15.el6.src.rpm

i386:
samba4-4.2.10-15.el6.i686.rpm
samba4-client-4.2.10-15.el6.i686.rpm
samba4-common-4.2.10-15.el6.i686.rpm
samba4-dc-4.2.10-15.el6.i686.rpm
samba4-dc-libs-4.2.10-15.el6.i686.rpm
samba4-debuginfo-4.2.10-15.el6.i686.rpm
samba4-devel-4.2.10-15.el6.i686.rpm
samba4-libs-4.2.10-15.el6.i686.rpm
samba4-pidl-4.2.10-15.el6.i686.rpm
samba4-python-4.2.10-15.el6.i686.rpm
samba4-test-4.2.10-15.el6.i686.rpm
samba4-winbind-4.2.10-15.el6.i686.rpm
samba4-winbind-clients-4.2.10-15.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.i686.rpm

ppc64:
samba4-4.2.10-15.el6.ppc64.rpm
samba4-client-4.2.10-15.el6.ppc64.rpm
samba4-common-4.2.10-15.el6.ppc64.rpm
samba4-dc-4.2.10-15.el6.ppc64.rpm
samba4-dc-libs-4.2.10-15.el6.ppc64.rpm
samba4-debuginfo-4.2.10-15.el6.ppc64.rpm
samba4-devel-4.2.10-15.el6.ppc64.rpm
samba4-libs-4.2.10-15.el6.ppc64.rpm
samba4-pidl-4.2.10-15.el6.ppc64.rpm
samba4-python-4.2.10-15.el6.ppc64.rpm
samba4-test-4.2.10-15.el6.ppc64.rpm
samba4-winbind-4.2.10-15.el6.ppc64.rpm
samba4-winbind-clients-4.2.10-15.el6.ppc64.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.ppc64.rpm

s390x:
samba4-4.2.10-15.el6.s390x.rpm
samba4-client-4.2.10-15.el6.s390x.rpm
samba4-common-4.2.10-15.el6.s390x.rpm
samba4-dc-4.2.10-15.el6.s390x.rpm
samba4-dc-libs-4.2.10-15.el6.s390x.rpm
samba4-debuginfo-4.2.10-15.el6.s390x.rpm
samba4-devel-4.2.10-15.el6.s390x.rpm
samba4-libs-4.2.10-15.el6.s390x.rpm
samba4-pidl-4.2.10-15.el6.s390x.rpm
samba4-python-4.2.10-15.el6.s390x.rpm
samba4-test-4.2.10-15.el6.s390x.rpm
samba4-winbind-4.2.10-15.el6.s390x.rpm
samba4-winbind-clients-4.2.10-15.el6.s390x.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.s390x.rpm

x86_64:
samba4-4.2.10-15.el6.x86_64.rpm
samba4-client-4.2.10-15.el6.x86_64.rpm
samba4-common-4.2.10-15.el6.x86_64.rpm
samba4-dc-4.2.10-15.el6.x86_64.rpm
samba4-dc-libs-4.2.10-15.el6.x86_64.rpm
samba4-debuginfo-4.2.10-15.el6.x86_64.rpm
samba4-devel-4.2.10-15.el6.x86_64.rpm
samba4-libs-4.2.10-15.el6.x86_64.rpm
samba4-pidl-4.2.10-15.el6.x86_64.rpm
samba4-python-4.2.10-15.el6.x86_64.rpm
samba4-test-4.2.10-15.el6.x86_64.rpm
samba4-winbind-4.2.10-15.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-15.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.2.10-15.el6.src.rpm

i386:
samba4-4.2.10-15.el6.i686.rpm
samba4-client-4.2.10-15.el6.i686.rpm
samba4-common-4.2.10-15.el6.i686.rpm
samba4-dc-4.2.10-15.el6.i686.rpm
samba4-dc-libs-4.2.10-15.el6.i686.rpm
samba4-debuginfo-4.2.10-15.el6.i686.rpm
samba4-devel-4.2.10-15.el6.i686.rpm
samba4-libs-4.2.10-15.el6.i686.rpm
samba4-pidl-4.2.10-15.el6.i686.rpm
samba4-python-4.2.10-15.el6.i686.rpm
samba4-test-4.2.10-15.el6.i686.rpm
samba4-winbind-4.2.10-15.el6.i686.rpm
samba4-winbind-clients-4.2.10-15.el6.i686.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.i686.rpm

x86_64:
samba4-4.2.10-15.el6.x86_64.rpm
samba4-client-4.2.10-15.el6.x86_64.rpm
samba4-common-4.2.10-15.el6.x86_64.rpm
samba4-dc-4.2.10-15.el6.x86_64.rpm
samba4-dc-libs-4.2.10-15.el6.x86_64.rpm
samba4-debuginfo-4.2.10-15.el6.x86_64.rpm
samba4-devel-4.2.10-15.el6.x86_64.rpm
samba4-libs-4.2.10-15.el6.x86_64.rpm
samba4-pidl-4.2.10-15.el6.x86_64.rpm
samba4-python-4.2.10-15.el6.x86_64.rpm
samba4-test-4.2.10-15.el6.x86_64.rpm
samba4-winbind-4.2.10-15.el6.x86_64.rpm
samba4-winbind-clients-4.2.10-15.el6.x86_64.rpm
samba4-winbind-krb5-locator-4.2.10-15.el6.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-2018-1050
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_release_notes/index.html
https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_technical_notes/index.html

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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