Samba Badlock Vulnerability - Nessus

High Plugin ID: 90509

This page contains detailed information about the Samba Badlock Vulnerability 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: 90509
Name: Samba Badlock Vulnerability
Filename: samba_badlock.nasl
Vulnerability Published: 2016-03-23
This Plugin Published: 2016-04-13
Last Modification Time: 2019-11-20
Plugin Version: 1.8
Plugin Type: remote
Plugin Family: General
Dependencies: samba_detect.nasl
Required KB Items [?]: SMB/name, SMB/samba, SMB/transport

Vulnerability Information

Severity: High
Vulnerability Published: 2016-03-23
Patch Published: 2016-04-12
CVE [?]: CVE-2016-2118
CPE [?]: cpe:/a:samba:samba
In the News: True

Synopsis

An SMB server running on the remote host is affected by the Badlock vulnerability.

Description

The version of Samba, a CIFS/SMB server for Linux and Unix, running on the remote host is affected by a flaw, known as Badlock, that 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 man-in-the-middle 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.

Solution

Upgrade to Samba version 4.2.11 / 4.3.8 / 4.4.2 or later.

Public Exploits

Target Network Port(s): 139, 445
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 Badlock Vulnerability 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(90509);
  script_version("1.8");
  script_cvs_date("Date: 2019/11/20");

  script_cve_id("CVE-2016-2118");
  script_bugtraq_id(86002);
  script_xref(name:"CERT", value:"813296");

  script_name(english:"Samba Badlock Vulnerability");
  script_summary(english:"Detects if the Badlock patch has been applied.");

  script_set_attribute(attribute:"synopsis", value:
"An SMB server running on the remote host is affected by the Badlock
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Samba, a CIFS/SMB server for Linux and Unix, running on
the remote host is affected by a flaw, known as Badlock, that 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 man-in-the-middle 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.");
  script_set_attribute(attribute:"see_also", value:"http://badlock.org");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2016-2118.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.2.11 / 4.3.8 / 4.4.2 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:"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:"General");

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

  script_dependencies("samba_detect.nasl");
  script_require_keys("SMB/samba", "SMB/name", "SMB/transport");
  script_require_ports(139, 445);

  exit(0);
}

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

# DCERPC reject status codes
PROTO_ERROR = 0x1c01000b;
RING_ERROR = 0x1c010002;

appname = "Samba";
get_kb_item_or_exit("SMB/samba");
name = kb_smb_name();
port = kb_smb_transport();

###
# Binds to one of the typically available pipes
# @return a fd to the pipe
##
function bind_to_pipe()
{
  local_var fid = bind_pipe (pipe:"\unixinfo", uuid:"9c54e310-a955-4885-bd31-78787147dfa6", vers:0);
  if (!isnull(fid)) return fid;

  fid = bind_pipe (pipe:"\spoolss", uuid:"12345678-1234-abcd-ef00-0123456789ab", vers:1);
  if (!isnull(fid)) return fid;

  fid = bind_pipe (pipe:"\lsarpc", uuid:"12345778-1234-abcd-ef00-0123456789ab", vers:0);
  if (!isnull(fid)) return fid;

  # if samba_detect.nasl is successful than we should never be able to
  # hit here since we know it successfully bound to a pipe.
  audit(AUDIT_RESP_BAD, port);
}

if (get_kb_item("Host/scanned") && !get_port_state(port)) audit(AUDIT_PORT_CLOSED, port);

# establish a connection
soc = open_sock_tcp(port);
if (!soc) audit(AUDIT_SOCK_FAIL, port);

# start the session and try to connect to the share
session_init(socket:soc, hostname:name);
if (NetUseAdd(share:"IPC$") != 1) audit(AUDIT_SHARE_FAIL, "IPC");

# We need to bind to a pipe. We know samba_detect did so try
# the known pipes
bound_pipe = bind_to_pipe();

# Make a ping request (this should be unexpected)
data = raw_word(w:0);
data = dce_rpc_pipe_request(fid:bound_pipe, code:0x3f, data:data, type:1);
smb_close (fid:bound_pipe);
NetUseDel();

if (!data || (strlen(data) < 28)) audit(AUDIT_RESP_BAD, port, "the RPC pipe request");
   
# Type should be fault (3)
if (get_byte (blob:data, pos:2) != 3) audit(AUDIT_RESP_BAD, port, "the type examination");

# Check against the two known errors; any third type will be flagged as a bad resp.
error = get_dword (blob:data, pos:24);
if (error == PROTO_ERROR) audit(AUDIT_INST_VER_NOT_VULN, appname);
else if (error != RING_ERROR) audit(AUDIT_RESP_BAD, port, "the error code check");

report = '\nNessus detected that the Samba Badlock patch has not been applied.\n';
security_report_v4(port:port, severity:SECURITY_WARNING, extra:report);

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

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

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How to Run

Here is how to run the Samba Badlock Vulnerability 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 General plugin family.
On the right side table select Samba Badlock Vulnerability plugin ID 90509.
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_badlock.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

/opt/nessus/bin/nasl -T - samba_badlock.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_badlock.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)
90508 - 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)
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)
11398 - Samba < 2.2.8 Multiple Vulnerabilities
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)
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_badlock.nasl version 1.8. For more plugins, visit the Nessus Plugin Library.

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Samba Badlock Vulnerability - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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