Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR) - Nessus

High   Plugin ID: 137655

This page contains detailed information about the Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR) 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

ID: 137655
Name: Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR)
Filename: cisco-sa-sxp-68TEVzR-iosxe.nasl
Vulnerability Published: 2020-06-03
This Plugin Published: 2020-06-19
Last Modification Time: 2021-04-28
Plugin Version: 1.10
Plugin Type: local
Plugin Family: CISCO
Dependencies: cisco_ios_xe_version.nasl
Required KB Items [?]: Host/Cisco/IOS-XE/Version

Vulnerability Information

Severity: High
Vulnerability Published: 2020-06-03
Patch Published: 2020-06-03
CVE [?]: CVE-2020-3228
CPE [?]: cpe:/o:cisco:ios_xe

Synopsis

The remote device is missing a vendor-supplied security patch

Description

A denial of service (DoS) vulnerability exists in Security Group Tag Exchange Protocol (SXP) in Cisco IOS Software, Cisco IOS XE Software, and Cisco NX-OS Software due to crafted SXP packets being mishandled. An unauthenticated, remote attacker can exploit this issue, by sending specifically crafted SXP packets to the affected device, to cause the device to reload, resulting in a DoS condition.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvd71220, CSCvp96954, CSCvt30182

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 Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR) vulnerability:

  1. GitHub: https://github.com/AlAIAL90/CVE-2020-3228
    [CVE-2020-3228: PoC for exploiting CVE-2020-3228 : A vulnerability in Security Group Tag Exchange ...]

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-2020-3228
CVSS V2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C/E:U/RL:OF/RC:C
CVSS Base Score:7.8 (High)
Impact Subscore:6.9
Exploitability Subscore:10.0
CVSS Temporal Score:5.8 (Medium)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:5.8 (Medium)
CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C
CVSS Base Score:8.6 (High)
Impact Subscore:4.0
Exploitability Subscore:3.9
CVSS Temporal Score:7.5 (High)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:7.5 (High)
STIG Severity [?]: I
STIG Risk Rating: High

Go back to menu.

Plugin Source

This is the cisco-sa-sxp-68TEVzR-iosxe.nasl nessus plugin source code. This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof. 

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

include('compat.inc');

if (description)
{
  script_id(137655);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/28");

  script_cve_id("CVE-2020-3228");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvd71220");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvp96954");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvt30182");
  script_xref(name:"CISCO-SA", value:"cisco-sa-sxp-68TEVzR");
  script_xref(name:"IAVA", value:"2020-A-0260");

  script_name(english:"Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"A denial of service (DoS) vulnerability exists in Security Group Tag Exchange Protocol (SXP) in Cisco IOS Software,
Cisco IOS XE Software, and Cisco NX-OS Software due to crafted SXP packets being mishandled. An unauthenticated, remote
attacker can exploit this issue, by sending specifically crafted SXP packets to the affected device, to cause the device
to reload, resulting in a DoS condition.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sxp-68TEVzR
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cc568213");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvd71220");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp96954");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt30182");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvd71220, CSCvp96954, CSCvt30182");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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-2020-3228");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xe");
  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) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_ios_xe_version.nasl");
  script_require_keys("Host/Cisco/IOS-XE/Version");

  exit(0);
}

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

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

version_list=make_list(
  '3.9.2bE',
  '3.9.2S',
  '3.9.2E',
  '3.9.1S',
  '3.9.1E',
  '3.9.0aS',
  '3.9.0S',
  '3.9.0E',
  '3.8.8E',
  '3.8.7E',
  '3.8.6E',
  '3.8.5aE',
  '3.8.5E',
  '3.8.4E',
  '3.8.3E',
  '3.8.2E',
  '3.8.1E',
  '3.8.0E',
  '3.7.5E',
  '3.7.4E',
  '3.7.3E',
  '3.7.2E',
  '3.7.1E',
  '3.7.0E',
  '3.6.9aE',
  '3.6.9E',
  '3.6.8E',
  '3.6.7bE',
  '3.6.7aE',
  '3.6.7E',
  '3.6.6E',
  '3.6.5bE',
  '3.6.5aE',
  '3.6.5E',
  '3.6.4E',
  '3.6.3E',
  '3.6.2aE',
  '3.6.1E',
  '3.6.10E',
  '3.6.0bE',
  '3.6.0aE',
  '3.6.0E',
  '3.5.3E',
  '3.5.2E',
  '3.5.1E',
  '3.5.0E',
  '3.3.5SE',
  '3.3.4SE',
  '3.3.3SE',
  '3.3.2XO',
  '3.3.2SE',
  '3.3.1XO',
  '3.3.1SE',
  '3.3.0XO',
  '3.3.0SE',
  '3.18.6SP',
  '3.18.5SP',
  '3.18.4SP',
  '3.18.3bSP',
  '3.18.3aSP',
  '3.18.3SP',
  '3.18.2aSP',
  '3.18.1aSP',
  '3.18.1SP',
  '3.18.0aS',
  '3.17.4S',
  '3.17.3S',
  '3.17.2S ',
  '3.17.1aS',
  '3.17.1S',
  '3.17.0S',
  '3.16.9S',
  '3.16.8S',
  '3.16.7bS',
  '3.16.7aS',
  '3.16.7S',
  '3.16.6bS',
  '3.16.6S',
  '3.16.5bS',
  '3.16.5aS',
  '3.16.5S',
  '3.16.4gS',
  '3.16.4eS',
  '3.16.4dS',
  '3.16.4cS',
  '3.16.4bS',
  '3.16.4aS',
  '3.16.3S',
  '3.16.2bS',
  '3.16.2S',
  '3.16.1aS',
  '3.16.1S',
  '3.16.10S',
  '3.16.0cS',
  '3.16.0S',
  '3.15.4S',
  '3.15.3S',
  '3.15.2S',
  '3.15.1cS',
  '3.15.1S',
  '3.15.0S',
  '3.14.4S',
  '3.14.3S',
  '3.14.2S',
  '3.14.1S',
  '3.14.0S',
  '3.13.9S',
  '3.13.8S',
  '3.13.7aS',
  '3.13.7S',
  '3.13.6bS',
  '3.13.6aS',
  '3.13.6S',
  '3.13.5aS',
  '3.13.5S',
  '3.13.4S',
  '3.13.3S',
  '3.13.2aS',
  '3.13.2S',
  '3.13.1S',
  '3.13.10S',
  '3.13.0aS',
  '3.13.0S',
  '3.12.4S',
  '3.12.3S',
  '3.12.2S',
  '3.12.1S',
  '3.12.0aS',
  '3.12.0S',
  '3.11.4S',
  '3.11.3S',
  '3.11.2S',
  '3.11.1S',
  '3.11.0S',
  '3.11.0E',
  '3.10.9S',
  '3.10.8aS',
  '3.10.8S',
  '3.10.7S',
  '3.10.6S',
  '3.10.5S',
  '3.10.4S',
  '3.10.3S',
  '3.10.3E',
  '3.10.2tS',
  '3.10.2aS',
  '3.10.2S',
  '3.10.2E',
  '3.10.1sE',
  '3.10.1aE',
  '3.10.1S',
  '3.10.1E',
  '3.10.10S',
  '3.10.0cE',
  '3.10.0S',
  '3.10.0E',
  '16.9.3s',
  '16.9.3a',
  '16.9.3',
  '16.9.2s',
  '16.9.2',
  '16.9.1s',
  '16.9.1d',
  '16.9.1c',
  '16.9.1a',
  '16.9.1',
  '16.8.3',
  '16.8.2',
  '16.8.1s',
  '16.8.1c',
  '16.8.1a',
  '16.8.1',
  '16.7.3',
  '16.7.2',
  '16.7.1',
  '16.6.6',
  '16.6.5b',
  '16.6.5',
  '16.6.4s',
  '16.6.4a',
  '16.6.4',
  '16.6.3',
  '16.6.2',
  '16.6.1',
  '16.5.3',
  '16.5.2',
  '16.5.1b',
  '16.5.1a',
  '16.5.1',
  '16.4.3',
  '16.4.2',
  '16.4.1',
  '16.3.9',
  '16.3.8',
  '16.3.7',
  '16.3.6',
  '16.3.5b',
  '16.3.5',
  '16.3.4',
  '16.3.3',
  '16.3.2',
  '16.3.1a',
  '16.3.1',
  '16.2.2',
  '16.2.1',
  '16.11.1s',
  '16.11.1c',
  '16.11.1b',
  '16.11.1a',
  '16.11.1',
  '16.10.2',
  '16.10.1s',
  '16.10.1e',
  '16.10.1b',
  '16.10.1a',
  '16.10.1',
  '16.1.3',
  '16.1.2',
  '16.1.1'
);

workarounds = make_list(CISCO_WORKAROUNDS['generic_workaround']);
workaround_params = WORKAROUND_CONFIG['cts_sxp'];

reporting = make_array(
  'port'     , product_info['port'], 
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvd71220, CSCvp96954, CSCvt30182'
);

cisco::check_and_report(
  product_info:product_info,
  reporting:reporting,
  workarounds:workarounds,
  workaround_params:workaround_params,
  vuln_versions:version_list
);

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-sxp-68TEVzR-iosxe.nasl
  • Windows:
    C:\ProgramData\Tenable\Nessus\nessus\plugins\cisco-sa-sxp-68TEVzR-iosxe.nasl
  • Mac OS X:
    /Library/Nessus/run/lib/nessus/plugins/cisco-sa-sxp-68TEVzR-iosxe.nasl

Go back to menu.

How to Run

Here is how to run the Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR) 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 CISCO plugin family.
  6. On the right side table select Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR) plugin ID 137655.
  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 cisco-sa-sxp-68TEVzR-iosxe.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a cisco-sa-sxp-68TEVzR-iosxe.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-sxp-68TEVzR-iosxe.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-sxp-68TEVzR-iosxe.nasl -t <IP/HOST>

Go back to menu.

References

IAVA | Information Assurance Vulnerability Alert:
  • 2020-A-0260
Cisco Bug ID: Cisco Security Advisory: CWE | Common Weakness Enumeration:
  • CWE-20 (Weakness) Improper Input Validation
See also: Similar and related Nessus plugins:
  • 137654 - Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR)
  • 137656 - Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service Vulnerability (cisco-sa-sxp-68TEVzR)
  • 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)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file cisco-sa-sxp-68TEVzR-iosxe.nasl version 1.10. For more plugins, visit the Nessus Plugin Library.

Go back to menu.