Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) - Nessus

High Plugin ID: 133603

This page contains detailed information about the Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 133603
Name: Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce)
Filename: cisco-sa-20200205-iosxr-cdp-rce.nasl
Vulnerability Published: 2020-02-05
This Plugin Published: 2020-02-10
Last Modification Time: 2022-01-24
Plugin Version: 1.9
Plugin Type: combined
Plugin Family: CISCO
Dependencies: cisco_ios_xr_version.nasl
Required KB Items [?]: Host/Cisco/IOS-XR/Version

Vulnerability Information

Severity: High
Vulnerability Published: 2020-02-05
Patch Published: 2020-02-05
CVE [?]: CVE-2020-3118
CPE [?]: cpe:/o:cisco:ios_xr

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, the Cisco IOS XR Software is affected by a remote code execution vulnerability within the Cisco Discovery Protocol due to improper validation of string input. An unauthenticated, adjacent attacker can exploit this to bypass authentication and execute arbitrary commands with root privileges.

Please see the included Cisco BIDs and Cisco Security Advisory for more information

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvr09190.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) vulnerability:

GitHub: https://github.com/epi052/CiscoNotes
[CVE-2020-3118]

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-2020-3118
CVSS V2 Vector: AV:A/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	8.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	6.5
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	8.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.4 (High)

STIG Severity [?]: I
STIG Risk Rating: High

Go back to menu.

Plugin Source

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

include('compat.inc');

if (description)
{
  script_id(133603);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/24");

  script_cve_id("CVE-2020-3118");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr09190");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20200205-iosxr-cdp-rce");
  script_xref(name:"IAVA", value:"2020-A-0041-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");

  script_name(english:"Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Cisco IOS XR Software is affected by a remote code execution vulnerability
within the Cisco Discovery Protocol due to improper validation of string input. An unauthenticated, adjacent
attacker can exploit this to bypass authentication and execute arbitrary commands with root privileges.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-iosxr-cdp-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b9623904");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr09190");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvr09190.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3118");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/02/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/02/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/10");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xr");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CISCO");

  script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_ios_xr_version.nasl");
  script_require_keys("Host/Cisco/IOS-XR/Version");

  exit(0);
}

include('audit.inc');
include('cisco_workarounds.inc');
include('ccf.inc');

product_info = cisco::get_product_info(name:'Cisco IOS XR');

model = get_kb_item('CISCO/model');
if (empty_or_null(model))
  model = product_info['model'];
model = toupper(model);

if ('ASR9' >< model && 'X64' >!< model)
{
  pies = make_array(
    '6.4.2', 'asr9k-px-6.4.2.CSCvr78185',
    '6.5.3', 'asr9k-px-6.5.3.CSCvr78185'
  );
}
else if ('ASR9' >< model)
{
  pies = make_array(
    '6.5.3', 'asr9k-x64-6.5.3.CSCvr78185'
  );
}
else if ('NCS5500' >< model)
{
  pies = make_array(
    '6.5.3', 'ncs5500-6.5.3.CSCvr78185'
  );
}
else if ('NCS540' >< model && 'L' >!< model)
{
  pies = make_array(
    '6.5.3', 'ncs540-6.5.3.CSCvr78185'
  );
}
else if ('NCS6' >< model)
{
  pies = make_array(
    '5.2.5', ' ncs6k-5.2.5.CSCvr78185'
  );
}
else if ('XRV9' >< model || 'XRV 9' >< model)
{
  pies = make_array(
    '6.6.2', 'xrv9k-6.5.3.CSCvr78185'
  );
}
else if ('NCS560' >< model)
{
  pies = make_array(
    '6.6.25', 'ncs560-6.6.25.CSCvr78185'
  );
}
else if ('CRS-PX' >< model)
{
  pies = make_array(
    '6.4.2', 'hfr-px-6.4.2.CSCvr78185'
  );
}
else if ('NCS5k' >< model)
{
    pies = make_array(
    '6.5.3', 'ncs5k-6.5.3.CSCvr78185'
  );
}
else if ('White box' >< model)
{
    pies = make_array(
    '6.6.12', 'iosxrwbd-6.6.12.CSCvr78185'
  );
}
else if ('NCS540L' >< model)
{
    pies = make_array(
    '7.0.1', 'ncs540l-7.0.1.CSCvr78185'
  );
}

# Check for patches
version = product_info['version'];
if (!empty_or_null(pies) && !empty_or_null(pies[version]))
{
  fixed_ver = product_info['version'] + ' with patch ' + pies[version];
  if (get_kb_item('Host/local_checks_enabled'))
  {
    buf = cisco_command_kb_item('Host/Cisco/Config/show_install_package_all', 'show install package all');
    if (check_cisco_result(buf))
    {
      if (pies[version] >< buf)
        audit(AUDIT_HOST_NOT, 'affected since patch '+pies[version]+' is installed');
    }
  }
}

vuln_ranges = [
  {'min_ver' : '6.6.1', 'fix_ver' : '6.6.3'},
  {'min_ver' : '6.6.25', 'fix_ver' : '7.0.2'}
];

workarounds = make_list(CISCO_WORKAROUNDS['cdp']);
workaround_params = make_list();

if (!empty_or_null(fixed_ver))
  fixed_ver = fixed_ver + ' or upgrade to 6.6.3 / 7.0.2';
else
  fixed_ver = 'Upgrade to 6.6.3 / 7.0.2';

reporting = make_array(
  'port'     , product_info['port'],
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvr09190',
  'fix'      , fixed_ver
);

cisco::check_and_report(
  product_info:product_info,
  workarounds:workarounds,
  workaround_params:workaround_params,
  reporting:reporting,
  vuln_ranges:vuln_ranges,
  router_only:TRUE
);

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/cisco-sa-20200205-iosxr-cdp-rce.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\cisco-sa-20200205-iosxr-cdp-rce.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/cisco-sa-20200205-iosxr-cdp-rce.nasl

Go back to menu.

How to Run

Here is how to run the Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) 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 CISCO plugin family.
On the right side table select Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) plugin ID 133603.
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 cisco-sa-20200205-iosxr-cdp-rce.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a cisco-sa-20200205-iosxr-cdp-rce.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - cisco-sa-20200205-iosxr-cdp-rce.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 cisco-sa-20200205-iosxr-cdp-rce.nasl -t <IP/HOST>

Go back to menu.

References

IAVA | Information Assurance Vulnerability Alert:

2020-A-0041-S

Cisco Bug ID:

CSCvr09190

Cisco Security Advisory:

cisco-sa-20200205-iosxr-cdp-rce

See also:

Similar and related Nessus plugins:

107004 - Cisco ASA Remote Code Execution and Denial of Service Vulnerability (cisco-sa-20180129-asa1) (destructive check)
69953 - Management Center for Cisco Security Agents Remote Code Execution (cisco-sa-20110216-csa)
79271 - Cisco Email Security Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
79272 - Cisco Content Security Management Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
79273 - Cisco Web Security Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
106630 - Cisco Firepower Threat Defense (FTD) Adaptive Security Appliance Remote Code Execution and Denial of Service Vulnerability (cisco-sa-20180129-asa1)
106484 - Cisco ASA Remote Code Execution and Denial of Service Vulnerability (cisco-sa-20180129-asa1)
108722 - Cisco IOS Software Smart Install Remote Code Execution Vulnerability
108723 - Cisco IOS XE Software Smart Install Remote Code Execution Vulnerability
126640 - Cisco Data Center Network Manager Arbitrary File Upload and Remote Code Execution Vulnerability
133604 - Cisco NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-nxos-cdp-rce)
160400 - Cisco Identity Services Log4j Engine Remote Code Execution (cisco-sa-apache-log4j-qRuKNEbd)
137901 - Cisco IOS Software One Platform Kit Remote Code Execution Vulnerability (cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC)
137902 - IOS XE Software One Platform Kit Remote Code Execution Vulnerability (cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC)
137903 - Cisco NX-OS Software One Platform Kit Remote Code Execution Vulnerability (cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC)
79584 - Cisco TelePresence Conductor Bash Remote Code Execution (Shellshock)
78596 - Cisco TelePresence Video Communication Server Bash Remote Code Execution (Shellshock)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file cisco-sa-20200205-iosxr-cdp-rce.nasl version 1.9. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Cisco IOS XR Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-iosxr-cdp-rce) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)