Samba Encrypted Password String Conversion Decryption Overflow - Nessus

Critical   Plugin ID: 11168

This page contains detailed information about the Samba Encrypted Password String Conversion Decryption Overflow 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

ID: 11168
Name: Samba Encrypted Password String Conversion Decryption Overflow
Filename: samba_unicode_overflow.nasl
Vulnerability Published: 2002-11-20
This Plugin Published: 2002-11-25
Last Modification Time: 2018-07-27
Plugin Version: 1.16
Plugin Type: remote
Plugin Family: Gain a shell remotely
Dependencies: smb_nativelanman.nasl
Required KB Items [?]: SMB/NativeLanManager

Vulnerability Information

Severity: Critical
Vulnerability Published: 2002-11-20
Patch Published: N/A
CVE [?]: CVE-2002-1318
CPE [?]: cpe:/a:samba:samba

Synopsis

Remote code can be executed on the remote server.

Description

The remote Samba server, according to its version number, is vulnerable to a bug in the length checking for encrypted password change requests from clients. A client could potentially send an encrypted password, which, when decrypted with the old hashed password could be used as a buffer overrun attack on the stack of smbd.

Solution

upgrade to Samba 2.2.7

Public Exploits

Target Network Port(s): 139
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Samba Encrypted Password String Conversion Decryption Overflow vulnerability:

  1. Metasploit: exploit/multi/samba/nttrans
    [Samba 2.2.2 - 2.2.6 nttrans Buffer Overflow]

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.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
CVSS Base Score:10.0 (High)
Impact Subscore:10.0
Exploitability Subscore:10.0
CVSS Temporal Score:8.3 (High)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:8.3 (High)

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Plugin Source

This is the samba_unicode_overflow.nasl nessus plugin source code. This script is Copyright (C) 2002-2018 Tenable Network Security, Inc. 

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

include("compat.inc");

if(description)
{
 script_id(11168);
 script_version ("1.16");
 script_cve_id("CVE-2002-1318");
 script_bugtraq_id(6210);

 script_name(english: "Samba Encrypted Password String Conversion Decryption Overflow");
 
 script_set_attribute(attribute:"synopsis", value:
"Remote code can be executed on the remote server." );
 script_set_attribute(attribute:"description", value:
"The remote Samba server, according to its version number, is vulnerable
to a bug in the length checking for encrypted password change requests 
from clients. A client could potentially send an encrypted password, 
which, when decrypted with the old hashed password could be used as a
buffer overrun attack on the stack of smbd." );
 script_set_attribute(attribute:"solution", value:
"upgrade to Samba 2.2.7" );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Samba 2.2.2 - 2.2.6 nttrans Buffer Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

 script_set_attribute(attribute:"plugin_publication_date", value: "2002/11/25");
 script_set_attribute(attribute:"vuln_publication_date", value: "2002/11/20");
 script_cvs_date("Date: 2018/07/27 18:38:14");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
script_end_attributes();
 
 script_summary(english: "checks samba version");
 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2002-2018 Tenable Network Security, Inc.");
 script_family(english: "Gain a shell remotely");
 script_dependencie("smb_nativelanman.nasl");
 script_require_ports(139);
 script_require_keys("SMB/NativeLanManager");
 exit(0);
}

#
# The script code starts here
#

lanman = get_kb_item("SMB/NativeLanManager");
if("Samba" >< lanman)
{
 # Samba 2.2.2 to 2.2.6 is affected
 if(ereg(pattern:"Samba 2\.2\.[2-6][^0-9]*$",
 	 string:lanman))security_hole(139);
}

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

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

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How to Run

Here is how to run the Samba Encrypted Password String Conversion Decryption Overflow as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

  1. Click to start a New Scan.
  2. Select Advanced Scan.
  3. Navigate to the Plugins tab.
  4. On the top right corner click to Disable All plugins.
  5. On the left side table select Gain a shell remotely plugin family.
  6. On the right side table select Samba Encrypted Password String Conversion Decryption Overflow plugin ID 11168.
  7. Specify the target on the Settings tab and click to Save the scan.
  8. 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_unicode_overflow.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID: See also: Similar and related Nessus plugins:
  • 15037 - Debian DSA-200-1 : samba - remote exploit
  • 13979 - Mandrake Linux Security Advisory : samba (MDKSA-2002:081)
  • 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
  • 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
  • 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)
  • 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
  • 90509 - Samba Badlock Vulnerability
  • 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)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file samba_unicode_overflow.nasl version 1.16. For more plugins, visit the Nessus Plugin Library.

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