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Red Hat Security Advisory 2016-0015-01

Red Hat Security Advisory 2016-0015-01
Posted Jan 8, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0015-01 - Samba is an open-source implementation of the Server Message Block or Common Internet File System protocol, which allows PC-compatible machines to share files, printers, and other information. 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. 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.

tags | advisory, remote, protocol
systems | linux, redhat
advisories | CVE-2015-5252, CVE-2015-5296, CVE-2015-5299, CVE-2015-5330, CVE-2015-7540
MD5 | 2e96ab811259133b53e00e3c518e6ac5

Red Hat Security Advisory 2016-0015-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: samba security update
Advisory ID: RHSA-2016:0015-01
Product: Red Hat Gluster Storage
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0015.html
Issue date: 2016-01-08
CVE Names: CVE-2015-5252 CVE-2015-5296 CVE-2015-5299
CVE-2015-5330 CVE-2015-7540
=====================================================================

1. Summary:

Updated samba packages that fix multiple security issues are now available
for Red Hat Gluster Storage 3.1 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 Gluster 3 Samba on RHEL-6 - noarch, 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 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)

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 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)

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 samba 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 Gluster 3 Samba on RHEL-6:

Source:
samba-4.1.17-16.el6rhs.src.rpm

noarch:
samba-pidl-4.1.17-16.el6rhs.noarch.rpm

x86_64:
libsmbclient-4.1.17-16.el6rhs.x86_64.rpm
libsmbclient-devel-4.1.17-16.el6rhs.x86_64.rpm
libwbclient-4.1.17-16.el6rhs.x86_64.rpm
libwbclient-devel-4.1.17-16.el6rhs.x86_64.rpm
samba-4.1.17-16.el6rhs.x86_64.rpm
samba-client-4.1.17-16.el6rhs.x86_64.rpm
samba-common-4.1.17-16.el6rhs.x86_64.rpm
samba-dc-4.1.17-16.el6rhs.x86_64.rpm
samba-dc-libs-4.1.17-16.el6rhs.x86_64.rpm
samba-debuginfo-4.1.17-16.el6rhs.x86_64.rpm
samba-devel-4.1.17-16.el6rhs.x86_64.rpm
samba-libs-4.1.17-16.el6rhs.x86_64.rpm
samba-python-4.1.17-16.el6rhs.x86_64.rpm
samba-test-4.1.17-16.el6rhs.x86_64.rpm
samba-test-devel-4.1.17-16.el6rhs.x86_64.rpm
samba-test-libs-4.1.17-16.el6rhs.x86_64.rpm
samba-vfs-glusterfs-4.1.17-16.el6rhs.x86_64.rpm
samba-winbind-4.1.17-16.el6rhs.x86_64.rpm
samba-winbind-clients-4.1.17-16.el6rhs.x86_64.rpm
samba-winbind-krb5-locator-4.1.17-16.el6rhs.x86_64.rpm
samba-winbind-modules-4.1.17-16.el6rhs.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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