EulerOS 2.0 SP1 : samba (EulerOS-SA-2016-1014)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote EulerOS host is missing multiple security updates.

Description :

According to the versions of the samba packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

- 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)

- 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 nauthenticated,
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 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.(CVE-2016-2113)

- 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.
(CVE-2016-2114)

- 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)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

See also :

http://www.nessus.org/u?0bbec453

Solution :

Update the affected samba packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.6
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Huawei Local Security Checks

Nessus Plugin ID: 99777 ()

Bugtraq ID:

CVE ID: CVE-2015-5370
CVE-2016-2110
CVE-2016-2111
CVE-2016-2112
CVE-2016-2113
CVE-2016-2114
CVE-2016-2115
CVE-2016-2118

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