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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Issues Fix) Samba Multiple Flaws Let Remote Users Access Data and Files, Obtain Potentially Sensitive Information, and Deny Service
SecurityTracker Alert ID:  1034620
SecurityTracker URL:  http://securitytracker.com/id/1034620
CVE Reference:   CVE-2015-5252, CVE-2015-5296, CVE-2015-5299, CVE-2015-5330   (Links to External Site)
Date:  Jan 8 2016
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 4.1.22, 4.2.7, 4.3.3
Description:   Multiple vulnerabilities were reported in Samba. A remote user can access data on the target system. A remote user can consume excessive CPU resources on the target system. A remote user can cause the target system to crash. A remote user can obtain files on the target system. A remote user can obtain potentially sensitive information on the target system.

A remote user can send a specially crafted request to the target Samba LDAP server to consume excessive CPU resources on the target system and cause the LDAP server to become unresponsive [CVE-2015-3223]. Versions 4.0.0 through 4.3.2 are affected.

Thilo Uttendorfer of Linux Information Systems AG reported this vulnerability.

The smbd server does not properly verify symbolic links (symlinks). In certain situations, a remote user can access files located outside of the exported share path [CVE-2015-5252]. Versions 3.0.0 through 4.3.2 are affected.

Jan 'Yenya' Kasprzak and the Computer Systems Unit team at Faculty of Informatics, Masaryk University reported this vulnerability.

The system does not properly negotiate signing when establishing an encrypted connection. A remote user that can conduct a man-in-the-middle attack can downgrade the connection and then connect via an unsigned, unencrypted connection [CVE-2015-5296]. Versions 3.2.0 through 4.3.2 are affected.

Stefan Metzmacher of SerNet (www.sernet.com) and the Samba Team reported this vulnerability.

The vfs_shadow_copy2 module does not properly enforce access controls. A remote user without the DIRECTORY_LIST access rights can view the current snapshots [CVE-2015-5299]. Versions 3.2.0 through 4.3.2 are affected.

A remote user can send specially crafted packets to cause the LDAP server in the target samba daemon process to return portions of heap memory [CVE-2015-5330]. Versions 4.0.0 through 4.3.2 are affected.

Douglas Bagnall of Catalyst (www.catalyst.net.nz) reported this vulnerability.

A remote authenticated non-administrative user can bypass the quota limit and create excessive accounts on the target system [CVE-2015-8467]. Versions 4.0.0 through 4.3.2 are affected.

A domain environment with Samba and Windows Active Directory Domain Controllers is affected.

Impact:   A remote user can obtain snapshot data on the target system.

A remote user can consume excessive CPU resources on the target system and cause the target LDAP service to become unresponsive.

A remote user can cause the target system to crash.

A remote user can obtain files on the target system that are located outside of the share path.

A remote user can obtain potentially sensitive information on the target system.

Solution:   Red Hat has issued a fix for CVE-2015-5252, CVE-2015-5296, CVE-2015-5299, and CVE-2015-5330.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0010.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0010.html (Links to External Site)
Cause:   Access control error, Resource 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.
Dec 18 2015 Samba Multiple Flaws Let Remote Users Access Data and Files, Obtain Potentially Sensitive Information, and Deny Service



 Source Message Contents

Subject:  [RHSA-2016:0010-02] Moderate: samba4 security update

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

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

Synopsis:          Moderate: samba4 security update
Advisory ID:       RHSA-2016:0010-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0010.html
Issue date:        2016-01-07
CVE Names:         CVE-2015-5252 CVE-2015-5296 CVE-2015-5299 
                   CVE-2015-5330 CVE-2015-7540 
=====================================================================

1. Summary:

Updated samba4 packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links 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.

A denial of service flaw was found in the LDAP server provided by the AD DC
in the Samba process daemon. A remote attacker could exploit this flaw by
sending a specially crafted packet, which could cause the server to consume
an excessive amount of memory and crash. (CVE-2015-7540)

Multiple buffer over-read flaws were found in the way Samba handled
malformed inputs in certain encodings. An authenticated, remote attacker
could possibly use these flaws to disclose portions of the server memory.
(CVE-2015-5330)

A man-in-the-middle vulnerability was found in the way "connection signing"
was implemented by Samba. A remote attacker could use this flaw to
downgrade an existing Samba client connection and force the use of plain
text. (CVE-2015-5296)

A missing access control flaw was found in Samba. A remote, authenticated
attacker could use this flaw to view the current snapshot on a Samba share,
despite not having DIRECTORY_LIST access rights. (CVE-2015-5299)

An access flaw was found in the way Samba verified symbolic links when
creating new files on a Samba share. A remote attacker could exploit this
flaw to gain access to files outside of Samba's share path. (CVE-2015-5252)

Red Hat would like to thank the Samba project for reporting these issues.
Upstream acknowledges Stefan Metzmacher of the Samba Team and Sernet.de as
the original reporters of CVE-2015-5296, partha@exablox.com as the original
reporter of CVE-2015-5299, Jan "Yenya" Kasprzak and the Computer Systems
Unit team at Faculty of Informatics, Masaryk University as the original
reporters of CVE-2015-5252 flaws, and Douglas Bagnall as the original
reporter of CVE-2015-5330.

All samba4 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing this
update, the smb service will be restarted automatically.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1276126 - CVE-2015-5299 Samba: Missing access control check in shadow copy code
1281326 - CVE-2015-5330 samba, libldb: remote memory read in the Samba LDAP server
1288451 - CVE-2015-7540 samba: DoS to AD-DC due to insufficient checking of asn1 memory allocation
1290288 - CVE-2015-5252 samba: Insufficient symlink verification in smbd
1290292 - CVE-2015-5296 samba: client requesting encryption vulnerable to downgrade attack

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
samba4-4.0.0-67.el6_7.rc4.src.rpm

i386:
samba4-4.0.0-67.el6_7.rc4.i686.rpm
samba4-client-4.0.0-67.el6_7.rc4.i686.rpm
samba4-common-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.i686.rpm
samba4-devel-4.0.0-67.el6_7.rc4.i686.rpm
samba4-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.i686.rpm
samba4-python-4.0.0-67.el6_7.rc4.i686.rpm
samba4-swat-4.0.0-67.el6_7.rc4.i686.rpm
samba4-test-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.i686.rpm

x86_64:
samba4-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-client-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-common-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-devel-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-python-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-swat-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-test-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.x86_64.rpm

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

Source:
samba4-4.0.0-67.el6_7.rc4.src.rpm

x86_64:
samba4-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-client-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-common-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-devel-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-python-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-swat-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-test-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
samba4-4.0.0-67.el6_7.rc4.src.rpm

i386:
samba4-4.0.0-67.el6_7.rc4.i686.rpm
samba4-client-4.0.0-67.el6_7.rc4.i686.rpm
samba4-common-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.i686.rpm
samba4-devel-4.0.0-67.el6_7.rc4.i686.rpm
samba4-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.i686.rpm
samba4-python-4.0.0-67.el6_7.rc4.i686.rpm
samba4-swat-4.0.0-67.el6_7.rc4.i686.rpm
samba4-test-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.i686.rpm

ppc64:
samba4-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-client-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-common-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-dc-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-devel-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-libs-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-python-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-swat-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-test-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.ppc64.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.ppc64.rpm

s390x:
samba4-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-client-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-common-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-dc-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-devel-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-libs-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-python-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-swat-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-test-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.s390x.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.s390x.rpm

x86_64:
samba4-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-client-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-common-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-devel-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-python-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-swat-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-test-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
samba4-4.0.0-67.el6_7.rc4.src.rpm

i386:
samba4-4.0.0-67.el6_7.rc4.i686.rpm
samba4-client-4.0.0-67.el6_7.rc4.i686.rpm
samba4-common-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-4.0.0-67.el6_7.rc4.i686.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.i686.rpm
samba4-devel-4.0.0-67.el6_7.rc4.i686.rpm
samba4-libs-4.0.0-67.el6_7.rc4.i686.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.i686.rpm
samba4-python-4.0.0-67.el6_7.rc4.i686.rpm
samba4-swat-4.0.0-67.el6_7.rc4.i686.rpm
samba4-test-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.i686.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.i686.rpm

x86_64:
samba4-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-client-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-common-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-dc-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-debuginfo-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-devel-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-libs-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-pidl-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-python-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-swat-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-test-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-clients-4.0.0-67.el6_7.rc4.x86_64.rpm
samba4-winbind-krb5-locator-4.0.0-67.el6_7.rc4.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-2015-5252
https://access.redhat.com/security/cve/CVE-2015-5296
https://access.redhat.com/security/cve/CVE-2015-5299
https://access.redhat.com/security/cve/CVE-2015-5330
https://access.redhat.com/security/cve/CVE-2015-7540
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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