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Red Hat Security Advisory 2016-0625-01

Red Hat Security Advisory 2016-0625-01
Posted Apr 13, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0625-01 - Samba is an open-source implementation of the Server Message Block protocol and the related Common Internet File System protocol, which allow PC-compatible machines to share files, printers, and various information. Security Fix: A protocol flaw, publicly referred to as Badlock, was found in the Security Account Manager Remote Protocol and the Local Security Authority Remote Protocol. Any authenticated DCE/RPC connection that a client initiates against a server could be used by a man-in-the-middle attacker to impersonate the authenticated user against the SAMR or LSA service on the server. As a result, the attacker would be able to get read/write access to the Security Account Manager database, and use this to reveal all passwords or any other potentially sensitive information in that database.

tags | advisory, remote, local, protocol
systems | linux, redhat
advisories | CVE-2016-2110, CVE-2016-2111, CVE-2016-2112, CVE-2016-2115, CVE-2016-2118
MD5 | 5a8efe293b99249b65c5201ebcb5461f

Red Hat Security Advisory 2016-0625-01

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

Synopsis: Important: samba security update
Advisory ID: RHSA-2016:0625-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0625.html
Issue date: 2016-04-12
CVE Names: CVE-2016-2110 CVE-2016-2111 CVE-2016-2112
CVE-2016-2115 CVE-2016-2118
=====================================================================

1. Summary:

An update for samba is now available for Red Hat Enterprise Linux 4
Extended Lifecycle Support.

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 AS (v. 4 ELS) - i386, ia64, x86_64
Red Hat Enterprise Linux ES (v. 4 ELS) - i386, 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 protocol flaw, publicly referred to as Badlock, was found in the
Security Account Manager Remote Protocol (MS-SAMR) and the Local Security
Authority (Domain Policy) Remote Protocol (MS-LSAD). Any authenticated
DCE/RPC connection that a client initiates against a server could be used
by a man-in-the-middle attacker to impersonate the authenticated user
against the SAMR or LSA service on the server. As a result, the attacker
would be able to get read/write access to the Security Account Manager
database, and use this to reveal all passwords or any other potentially
sensitive information in that database. (CVE-2016-2118)

* Several flaws were found in Samba's implementation of NTLMSSP
authentication. An unauthenticated, man-in-the-middle attacker could use
this flaw to clear the encryption and integrity flags of a connection,
causing data to be transmitted in plain text. The attacker could also force
the client or server into sending data in plain text even if encryption was
explicitly requested for that connection. (CVE-2016-2110)

* It was discovered that Samba configured as a Domain Controller would
establish a secure communication channel with a machine using a spoofed
computer name. A remote attacker able to observe network traffic could use
this flaw to obtain session-related information about the spoofed machine.
(CVE-2016-2111)

* It was found that Samba's LDAP implementation did not enforce integrity
protection for LDAP connections. A man-in-the-middle attacker could use
this flaw to downgrade LDAP connections to use no integrity protection,
allowing them to hijack such connections. (CVE-2016-2112)

* It was found that Samba did not enable integrity protection for IPC
traffic by default. A man-in-the-middle attacker could use this flaw to
view and modify the data sent between a Samba server and a client.
(CVE-2016-2115)

Red Hat would like to thank the Samba project for reporting these issues.
Upstream acknowledges Stefan Metzmacher (SerNet) as the original reporter
of CVE-2016-2118, CVE-2016-2110, CVE-2016-2112, and CVE-2016-2115.

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/):

1311893 - CVE-2016-2110 samba: Man-in-the-middle attacks possible with NTLMSSP authentication
1311902 - CVE-2016-2111 samba: Spoofing vulnerability when domain controller is configured
1311903 - CVE-2016-2112 samba: Missing downgrade detection
1312084 - CVE-2016-2115 samba: Smb signing not required by default when smb client connection is used for ipc usage
1317990 - CVE-2016-2118 samba: SAMR and LSA man in the middle attacks

6. Package List:

Red Hat Enterprise Linux AS (v. 4 ELS):

Source:
samba-3.0.33-3.37.el4.src.rpm

i386:
samba-3.0.33-3.37.el4.i386.rpm
samba-client-3.0.33-3.37.el4.i386.rpm
samba-common-3.0.33-3.37.el4.i386.rpm
samba-debuginfo-3.0.33-3.37.el4.i386.rpm
samba-swat-3.0.33-3.37.el4.i386.rpm

ia64:
samba-3.0.33-3.37.el4.ia64.rpm
samba-client-3.0.33-3.37.el4.ia64.rpm
samba-common-3.0.33-3.37.el4.i386.rpm
samba-common-3.0.33-3.37.el4.ia64.rpm
samba-debuginfo-3.0.33-3.37.el4.i386.rpm
samba-debuginfo-3.0.33-3.37.el4.ia64.rpm
samba-swat-3.0.33-3.37.el4.ia64.rpm

x86_64:
samba-3.0.33-3.37.el4.x86_64.rpm
samba-client-3.0.33-3.37.el4.x86_64.rpm
samba-common-3.0.33-3.37.el4.i386.rpm
samba-common-3.0.33-3.37.el4.x86_64.rpm
samba-debuginfo-3.0.33-3.37.el4.i386.rpm
samba-debuginfo-3.0.33-3.37.el4.x86_64.rpm
samba-swat-3.0.33-3.37.el4.x86_64.rpm

Red Hat Enterprise Linux ES (v. 4 ELS):

Source:
samba-3.0.33-3.37.el4.src.rpm

i386:
samba-3.0.33-3.37.el4.i386.rpm
samba-client-3.0.33-3.37.el4.i386.rpm
samba-common-3.0.33-3.37.el4.i386.rpm
samba-debuginfo-3.0.33-3.37.el4.i386.rpm
samba-swat-3.0.33-3.37.el4.i386.rpm

x86_64:
samba-3.0.33-3.37.el4.x86_64.rpm
samba-client-3.0.33-3.37.el4.x86_64.rpm
samba-common-3.0.33-3.37.el4.i386.rpm
samba-common-3.0.33-3.37.el4.x86_64.rpm
samba-debuginfo-3.0.33-3.37.el4.i386.rpm
samba-debuginfo-3.0.33-3.37.el4.x86_64.rpm
samba-swat-3.0.33-3.37.el4.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-2016-2110
https://access.redhat.com/security/cve/CVE-2016-2111
https://access.redhat.com/security/cve/CVE-2016-2112
https://access.redhat.com/security/cve/CVE-2016-2115
https://access.redhat.com/security/cve/CVE-2016-2118
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/badlock
https://access.redhat.com/articles/2253041
http://badlock.org/
https://access.redhat.com/articles/2243351

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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