Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) - Nessus

High Plugin ID: 90508

This page contains detailed information about the Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 90508
Name: Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock)
Filename: samba_4_3_7.nasl
Vulnerability Published: 2016-03-23
This Plugin Published: 2016-04-13
Last Modification Time: 2019-11-20
Plugin Version: 1.13
Plugin Type: remote
Plugin Family: Misc.
Dependencies: smb_nativelanman.nasl
Required KB Items [?]: Settings/ParanoidReport, SMB/NativeLanManager, SMB/samba

Vulnerability Information

Severity: High
Vulnerability Published: 2016-03-23
Patch Published: 2016-04-12
CVE [?]: CVE-2015-5370, CVE-2016-2110, CVE-2016-2111, CVE-2016-2112, CVE-2016-2113, CVE-2016-2114, CVE-2016-2115, CVE-2016-2118
CPE [?]: cpe:/a:samba:samba
In the News: True

Synopsis

The remote Samba server is affected by multiple vulnerabilities.

Description

The version of Samba running on the remote host is 3.x or 4.2.x prior to 4.2.10, 4.3.x prior to 4.3.7, or 4.4.x prior to 4.4.1. It is, therefore, affected by multiple vulnerabilities :

- A flaw exists in the DCE-RPC client when handling specially crafted DCE-RPC packets. A man-in-the-middle (MitM) attacker can exploit this to downgrade the connection security, cause a denial of service through resource exhaustion, or potentially execute arbitrary code. (CVE-2015-5370)

- A flaw exists in the implementation of NTLMSSP authentication. A MitM attacker can exploit this to clear the NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL settings, take over the connections, cause traffic to be sent unencrypted, or have other unspecified impact. (CVE-2016-2110)

- A flaw exists in NETLOGON due to a failure to properly establish a secure channel connection. A MitM attacker can exploit this to spoof the computer names of a secure channel's endpoints, potentially gaining session information. (CVE-2016-2111)

- A flaw exists in the integrity protection mechanisms that allows a MitM attacker to downgrade a secure LDAP connection to an insecure version. (CVE-2016-2112)

- A flaw exists due to improper validation of TLS certificates for the LDAP and HTTP protocols. A MitM attacker can exploit this, via a crafted certificate, to spoof a server, resulting in the disclosure or manipulation of the transmitted traffic. (CVE-2016-2113)

- A flaw exists due to a failure to enforce the 'server signing = mandatory' option in smb.conf for clients using the SMB1 protocol. A MitM attacker can exploit this to conduct spoofing attacks. (CVE-2016-2114)

- A flaw exists due to a failure to perform integrity checking for SMB client connections. A MitM attacker can exploit this to conduct spoofing attacks since the protection mechanisms for DCERPC communication sessions are inherited from the underlying SMB connection. (CVE-2016-2115)

- A flaw, known as Badlock, exists in the Security Account Manager (SAM) and Local Security Authority (Domain Policy) (LSAD) protocols due to improper authentication level negotiation over Remote Procedure Call (RPC) channels. A MitM attacker who is able to able to intercept the traffic between a client and a server hosting a SAM database can exploit this flaw to force a downgrade of the authentication level, which allows the execution of arbitrary Samba network calls in the context of the intercepted user, such as viewing or modifying sensitive security data in the Active Directory (AD) database or disabling critical services. (CVE-2016-2118)

Solution

Upgrade to Samba version 4.2.10 / 4.3.7 / 4.4.1 or later.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) vulnerability:

GitHub: https://github.com/nickanderson/cfengine-CVE-2016-2118
[CVE-2016-2118: An example detection and remediation policy.]
GitHub: https://github.com/trend-anz/Deep-Security-Open-Patch
[CVE-2016-2118]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2016-2118
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C

CVSS Base Score:	6.8 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	8.6
CVSS Temporal Score:	5.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.0 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	7.5 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.6
CVSS Temporal Score:	6.5 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.5 (Medium)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(90508);
  script_version("1.13");
  script_cvs_date("Date: 2019/11/20");

  script_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"
  );
  script_bugtraq_id(86002);
  script_xref(name:"CERT", value:"813296");

  script_name(english:"Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock)");
  script_summary(english:"Checks the version of Samba.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Samba running on the remote host is 3.x or 4.2.x prior
to 4.2.10, 4.3.x prior to 4.3.7, or 4.4.x prior to 4.4.1. It is,
therefore, affected by multiple vulnerabilities :

  - A flaw exists in the DCE-RPC client when handling
    specially crafted DCE-RPC packets. A man-in-the-middle
    (MitM) attacker can exploit this to downgrade the
    connection security, cause a denial of service through
    resource exhaustion, or potentially execute arbitrary
    code. (CVE-2015-5370)

  - A flaw exists in the implementation of NTLMSSP
    authentication. A MitM attacker can exploit this to
    clear the NTLMSSP_NEGOTIATE_SIGN and
    NTLMSSP_NEGOTIATE_SEAL settings, take over the
    connections, cause traffic to be sent unencrypted, or
    have other unspecified impact. (CVE-2016-2110)

  - A flaw exists in NETLOGON due to a failure to properly
    establish a secure channel connection. A MitM attacker
    can exploit this to spoof the computer names of a secure
    channel's endpoints, potentially gaining session
    information. (CVE-2016-2111)

  - A flaw exists in the integrity protection mechanisms
    that allows a MitM attacker to downgrade a secure LDAP
    connection to an insecure version. (CVE-2016-2112)

  - A flaw exists due to improper validation of TLS
    certificates for the LDAP and HTTP protocols. A MitM
    attacker can exploit this, via a crafted certificate,
    to spoof a server, resulting in the disclosure or
    manipulation of the transmitted traffic. (CVE-2016-2113)

  - A flaw exists due to a failure to enforce the
    'server signing = mandatory' option in smb.conf for
    clients using the SMB1 protocol. A MitM attacker can
    exploit this to conduct spoofing attacks.
    (CVE-2016-2114)

  - A flaw exists due to a failure to perform integrity
    checking for SMB client connections. A MitM attacker can
    exploit this to conduct spoofing attacks since the
    protection mechanisms for DCERPC communication sessions
    are inherited from the underlying SMB connection.
    (CVE-2016-2115)

  - A flaw, known as Badlock, exists in the Security Account
    Manager (SAM) and Local Security Authority
    (Domain Policy) (LSAD) protocols due to improper
    authentication level negotiation over Remote Procedure
    Call (RPC) channels. A MitM attacker who is able to able
    to intercept the traffic between a client and a server
    hosting a SAM database can exploit this flaw to force a
    downgrade of the authentication level, which allows the
    execution of arbitrary Samba network calls in the
    context of the intercepted user, such as viewing or
    modifying sensitive security data in the Active
    Directory (AD) database or disabling critical services.
    (CVE-2016-2118)");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2015-5370.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2110.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2111.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2112.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2113.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2114.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2115.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2118.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.2.10.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.3.7.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.4.1.html");
  script_set_attribute(attribute:"see_also", value:"http://badlock.org");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.2.10 / 4.3.7 / 4.4.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-2118");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/03/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/04/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/04/13");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_nativelanman.nasl");
  script_require_keys("SMB/NativeLanManager", "SMB/samba", "Settings/ParanoidReport");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_kb_item("SMB/transport");
if (!port) port = 445;

lanman = get_kb_item_or_exit("SMB/NativeLanManager");

if ("Samba " >!< lanman) audit(AUDIT_NOT_LISTEN, "Samba", port);

version = lanman - 'Samba ';

if (version =~ "^4(\.[1-4])?$" || version =~ "^3$")
  audit(AUDIT_VER_NOT_GRANULAR, "Samba", port, version);

fix = NULL;

regexes = make_array(-2, "a(\d+)", -1, "rc(\d+)");

# Affected :
# 3.x.x < 4.2.10
# 4.2.x < 4.2.10
# 4.3.x < 4.3.7
# 4.4.0 < 4.4.1
if (
  version =~ "^3\." ||
  version =~ "^4\.[01]\."
)
  fix = '4.2.10';
if (version =~ "^4\.2\.")
  fix = '4.2.10';
if (version =~ "^4\.3\.")
  fix = '4.3.7';
if (version =~ "^4\.4\.")
  fix = '4.4.1';

if (
  version =~ "^3\." ||
  fix && ver_compare(ver:version, fix:fix, regexes:regexes) < 0
)
{
  report = '\n  Installed version : ' + version +
           '\n  Fixed version     : ' + fix +
           '\n';
  security_report_v4(port:port, severity:SECURITY_WARNING, extra: report);
}
else audit(AUDIT_LISTEN_NOT_VULN, "Samba", port, version);

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/samba_4_3_7.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\samba_4_3_7.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/samba_4_3_7.nasl

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How to Run

Here is how to run the Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Misc. plugin family.
On the right side table select Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) plugin ID 90508.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl samba_4_3_7.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a samba_4_3_7.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - samba_4_3_7.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state samba_4_3_7.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

86002

CERT | Computer Emergency Response Team:

813296

See also:

Similar and related Nessus plugins:

90510 - MS16-047: Security Update for SAM and LSAD Remote Protocols (3148527) (Badlock) (uncredentialed check)
90509 - Samba Badlock Vulnerability
90440 - MS16-047: Security Update for SAM and LSAD Remote Protocols (3148527) (Badlock)
122056 - Samba < 2.2.8a Remote Code Execution Vulnerability
25217 - Samba < 3.0.25 Multiple Vulnerabilities
29253 - Samba < 3.0.28 send_mailslot Function Remote Buffer Overflow
17720 - Samba SWAT 3.0.2 - 3.0.4 HTTP Basic Auth base64 Buffer Overflow
47036 - Samba 3.x < 3.3.13 SMB1 Packet Chaining Memory Corruption
55733 - Samba 3.x < 3.3.16 / 3.4.14 / 3.5.10 Multiple Vulnerabilities
82580 - Samba 3.0.0 'SamrChangePassword' RCE
69276 - Samba 3.x < 3.5.22 / 3.6.x < 3.6.17 / 4.0.x < 4.0.8 read_nttrans_ea_lis DoS
132023 - Samba 4.x < 4.9.17 / 4.10.x < 4.10.11 / 4.11.x < 4.11.3 Multiple Vulnerabilities
133210 - Samba 4.x < 4.9.18 / 4.10.x < 4.10.12 / 4.11.x < 4.11.5 Multiple Vulnerabilities
81485 - Samba 3.5.x < 3.5.22 / 3.6.x < 3.6.25 / 4.0.x < 4.0.25 / 4.1.x < 4.1.17 TALLOC_FREE() RCE
138223 - Samba 4.x < 4.10.17 / 4.11.x < 4.11.11 / 4.12.x < 4.12.4 Multiple Vulnerabilities
142419 - Samba 3.6.x < 4.11.15 / 4.12.x < 4.12.9 / 4.13.x < 4.13.1 Multiple Vulnerabilities
149699 - Samba 4.12.x < 4.12.14 / 4.13.x < 4.13.7 / 4.14.x < 4.14.2 Multiple DoS
149350 - Samba 3.6.x < 4.12.15 / 4.13.x < 4.13.8 / 4.14.x < 4.14.4 Unauthorized File Access
155620 - Samba 4.13.x < 4.13.14 / 4.14.x < 4.14.10 / 4.15.x < 4.15.2 Multiple Vulnerabilities
157360 - Samba 4.13.x < 4.13.17 / 4.14.x < 4.14.12 / 4.15.x < 4.15.5 Multiple Vulnerabilities
100388 - Samba 3.5.x < 4.4 / 4.4.x < 4.4.14 / 4.5.x < 4.5.10 / 4.6.x < 4.6.4 Shared Library RCE
103535 - Samba 4.4.x < 4.4.16 / 4.5.x < 4.5.14 / 4.6.x < 4.6.8 Multiple Vulnerabilities
108378 - Samba 4.5.x < 4.5.16 / 4.6.x < 4.6.14 / 4.7.x < 4.7.6 Multiple Vulnerabilities
130628 - Samba 4.5.x / 4.6.x / 4.7.x / 4.8.x / 4.9.x < 4.9.15 / 4.10.x < 4.10.10 / 4.11.x < 4.11.2 Password Complexity Check Bypass (CVE-2019-14833)
130629 - Samba 4.x < 4.9.15 / 4.10.x < 4.10.10 AD DC LDAP Server Denial of Service (CVE-2019-14847)
25216 - Samba NDR MS-RPC Request Heap-Based Remote Buffer Overflow
58662 - Samba 3.x < 3.6.4 / 3.5.14 / 3.4.16 RPC Multiple Buffer Overflows
44406 - Samba Symlink Traversal Arbitrary File Access (unsafe check)
11398 - Samba < 2.2.8 Multiple Vulnerabilities
11442 - Samba TNG < 0.3.1 Multiple Remote Vulnerabilities
11523 - Samba < 2.2.8a / 3.0.0 Multiple Remote Overflows
11168 - Samba Encrypted Password String Conversion Decryption Overflow

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file samba_4_3_7.nasl version 1.13. For more plugins, visit the Nessus Plugin Library.

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Samba 3.x < 4.2.10 / 4.2.x < 4.2.10 / 4.3.x < 4.3.7 / 4.4.x < 4.4.1 Multiple Vulnerabilities (Badlock) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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