[RHSA-2016:0624-01] Critical: samba3x security update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Critical: samba3x security update

Advisory ID: RHSA-2016:0624-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0624.html

Issue date: 2016-04-12

CVE Names: CVE-2015-5370 CVE-2016-2110 CVE-2016-2111

CVE-2016-2112 CVE-2016-2115 CVE-2016-2118

=====================================================================

 

1. Summary:

 

An update for samba3x is now available for Red Hat Enterprise Linux 5.6

Long Life and Red Hat Enterprise Linux 5.9 Long Life.

 

Red Hat Product Security has rated this update as having a security impact

of Critical. 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 Long Life (v. 5.6 server) - i386, ia64, x86_64

Red Hat Enterprise Linux Long Life (v. 5.9 server) - i386, ia64, ppc, s390x, 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):

 

* Multiple flaws were found in Samba's DCE/RPC protocol implementation. A

remote, authenticated attacker could use these flaws to cause a denial of

service against the Samba server (high CPU load or a crash) or, possibly,

execute arbitrary code with the permissions of the user running Samba

(root). This flaw could also be used to downgrade a secure DCE/RPC

connection by a man-in-the-middle attacker taking control of an Active

Directory (AD) object and compromising the security of a Samba Active

Directory Domain Controller (DC). (CVE-2015-5370)

 

Note: While Samba packages as shipped in Red Hat Enterprise Linux do not

support running Samba as an AD DC, this flaw applies to all roles Samba

implements.

 

* 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 Jouni Knuutinen (Synopsis) as the original reporter

of CVE-2015-5370; and 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/):

 

1309987 - CVE-2015-5370 samba: crash in dcesrv_auth_bind_ack due to missing error check

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 Long Life (v. 5.6 server):

 

Source:

samba3x-3.6.23-12.el5_6.src.rpm

 

i386:

samba3x-3.6.23-12.el5_6.i386.rpm

samba3x-client-3.6.23-12.el5_6.i386.rpm

samba3x-common-3.6.23-12.el5_6.i386.rpm

samba3x-debuginfo-3.6.23-12.el5_6.i386.rpm

samba3x-doc-3.6.23-12.el5_6.i386.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_6.i386.rpm

samba3x-swat-3.6.23-12.el5_6.i386.rpm

samba3x-winbind-3.6.23-12.el5_6.i386.rpm

samba3x-winbind-devel-3.6.23-12.el5_6.i386.rpm

 

ia64:

samba3x-3.6.23-12.el5_6.ia64.rpm

samba3x-client-3.6.23-12.el5_6.ia64.rpm

samba3x-common-3.6.23-12.el5_6.ia64.rpm

samba3x-debuginfo-3.6.23-12.el5_6.ia64.rpm

samba3x-doc-3.6.23-12.el5_6.ia64.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_6.ia64.rpm

samba3x-swat-3.6.23-12.el5_6.ia64.rpm

samba3x-winbind-3.6.23-12.el5_6.ia64.rpm

samba3x-winbind-devel-3.6.23-12.el5_6.ia64.rpm

 

x86_64:

samba3x-3.6.23-12.el5_6.x86_64.rpm

samba3x-client-3.6.23-12.el5_6.x86_64.rpm

samba3x-common-3.6.23-12.el5_6.x86_64.rpm

samba3x-debuginfo-3.6.23-12.el5_6.i386.rpm

samba3x-debuginfo-3.6.23-12.el5_6.x86_64.rpm

samba3x-doc-3.6.23-12.el5_6.x86_64.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_6.x86_64.rpm

samba3x-swat-3.6.23-12.el5_6.x86_64.rpm

samba3x-winbind-3.6.23-12.el5_6.i386.rpm

samba3x-winbind-3.6.23-12.el5_6.x86_64.rpm

samba3x-winbind-devel-3.6.23-12.el5_6.i386.rpm

samba3x-winbind-devel-3.6.23-12.el5_6.x86_64.rpm

 

Red Hat Enterprise Linux Long Life (v. 5.9 server):

 

Source:

samba3x-3.6.23-12.el5_9.src.rpm

 

i386:

samba3x-3.6.23-12.el5_9.i386.rpm

samba3x-client-3.6.23-12.el5_9.i386.rpm

samba3x-common-3.6.23-12.el5_9.i386.rpm

samba3x-debuginfo-3.6.23-12.el5_9.i386.rpm

samba3x-doc-3.6.23-12.el5_9.i386.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_9.i386.rpm

samba3x-swat-3.6.23-12.el5_9.i386.rpm

samba3x-winbind-3.6.23-12.el5_9.i386.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.i386.rpm

 

ia64:

samba3x-3.6.23-12.el5_9.ia64.rpm

samba3x-client-3.6.23-12.el5_9.ia64.rpm

samba3x-common-3.6.23-12.el5_9.ia64.rpm

samba3x-debuginfo-3.6.23-12.el5_9.ia64.rpm

samba3x-doc-3.6.23-12.el5_9.ia64.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_9.ia64.rpm

samba3x-swat-3.6.23-12.el5_9.ia64.rpm

samba3x-winbind-3.6.23-12.el5_9.ia64.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.ia64.rpm

 

ppc:

samba3x-3.6.23-12.el5_9.ppc.rpm

samba3x-client-3.6.23-12.el5_9.ppc.rpm

samba3x-common-3.6.23-12.el5_9.ppc.rpm

samba3x-debuginfo-3.6.23-12.el5_9.ppc.rpm

samba3x-debuginfo-3.6.23-12.el5_9.ppc64.rpm

samba3x-doc-3.6.23-12.el5_9.ppc.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_9.ppc.rpm

samba3x-swat-3.6.23-12.el5_9.ppc.rpm

samba3x-winbind-3.6.23-12.el5_9.ppc.rpm

samba3x-winbind-3.6.23-12.el5_9.ppc64.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.ppc.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.ppc64.rpm

 

s390x:

samba3x-3.6.23-12.el5_9.s390x.rpm

samba3x-client-3.6.23-12.el5_9.s390x.rpm

samba3x-common-3.6.23-12.el5_9.s390x.rpm

samba3x-debuginfo-3.6.23-12.el5_9.s390.rpm

samba3x-debuginfo-3.6.23-12.el5_9.s390x.rpm

samba3x-doc-3.6.23-12.el5_9.s390x.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_9.s390x.rpm

samba3x-swat-3.6.23-12.el5_9.s390x.rpm

samba3x-winbind-3.6.23-12.el5_9.s390.rpm

samba3x-winbind-3.6.23-12.el5_9.s390x.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.s390.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.s390x.rpm

 

x86_64:

samba3x-3.6.23-12.el5_9.x86_64.rpm

samba3x-client-3.6.23-12.el5_9.x86_64.rpm

samba3x-common-3.6.23-12.el5_9.x86_64.rpm

samba3x-debuginfo-3.6.23-12.el5_9.i386.rpm

samba3x-debuginfo-3.6.23-12.el5_9.x86_64.rpm

samba3x-doc-3.6.23-12.el5_9.x86_64.rpm

samba3x-domainjoin-gui-3.6.23-12.el5_9.x86_64.rpm

samba3x-swat-3.6.23-12.el5_9.x86_64.rpm

samba3x-winbind-3.6.23-12.el5_9.i386.rpm

samba3x-winbind-3.6.23-12.el5_9.x86_64.rpm

samba3x-winbind-devel-3.6.23-12.el5_9.i386.rpm

samba3x-winbind-devel-3.6.23-12.el5_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-2015-5370

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/#critical

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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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