Scientific Linux Security Update : samba and samba4 on SL6.x, SL7.x i386/x86_64 (Badlock)

This script is Copyright (C) 2016 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

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).

Note: While Samba packages as shipped in Scientific 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.

- 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.

- It was found that Samba did not validate SSL/TLS
certificates in certain connections. A man-in-the-middle
attacker could use this flaw to spoof a Samba server
using a specially crafted SSL/TLS certificate.

- It was discovered that Samba did not enforce Server
Message Block (SMB) signing for clients using the SMB1
protocol. A man-in-the-middle attacker could use this
flaw to modify traffic between a client and a server.

- 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)

See also :

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 90502 ()

Bugtraq ID:

CVE ID: CVE-2015-5370

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