Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service (CVE-2020-3228)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501317);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/16");

  script_cve_id("CVE-2020-3228");

  script_name(english:"Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Service (CVE-2020-3228)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in Security Group Tag Exchange Protocol (SXP) in Cisco
IOS Software, Cisco IOS XE Software, and Cisco NX-OS Software could
allow an unauthenticated, remote attacker to cause the affected device
to reload, resulting in a denial of service (DoS) condition. The
vulnerability exists because crafted SXP packets are mishandled. An
attacker could exploit this vulnerability by sending specifically
crafted SXP packets to the affected device. A successful exploit could
allow the attacker to cause the affected device to reload, resulting
in a DoS condition.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # 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:"solution", value:
"Refer to the vendor advisory.");
  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:"2023/07/25");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nexus_1000v_series_switches");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2023-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Cisco");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Cisco');

var asset = tenable_ot::assets::get(vendor:'Cisco');

var vuln_cpes = {
    "cpe:/o:cisco:nexus_1000v_series_switches:5.2%281%29SV5%281.1%29" :
        {"versionEndIncluding" : "5.2%281%29SV5%281.1%29", "versionStartIncluding" : "5.2%281%29SV5%281.1%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_1000v_series_switches:5.2%281%29SV5%281.2%29" :
        {"versionEndIncluding" : "5.2%281%29SV5%281.2%29", "versionStartIncluding" : "5.2%281%29SV5%281.2%29", "family" : "NXOS"},
    "cpe:/o:cisco:nexus_1000v_series_switches:5.2%281%29SV5%281.3%29" :
        {"versionEndIncluding" : "5.2%281%29SV5%281.3%29", "versionStartIncluding" : "5.2%281%29SV5%281.3%29", "family" : "NXOS"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_HOLE);