Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service (CVE-2020-3120)

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

include('compat.inc');

if (description)
{
  script_id(501267);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/26");

  script_cve_id("CVE-2020-3120");
  script_xref(name:"CEA-ID", value:"CEA-2020-0016");

  script_name(english:"Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service (CVE-2020-3120)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in the Cisco Discovery Protocol implementation for
Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software
could allow an unauthenticated, adjacent attacker to cause a reload of
an affected device, resulting in a denial of service (DoS) condition.
The vulnerability is due to a missing check when the affected software
processes Cisco Discovery Protocol messages. An attacker could exploit
this vulnerability by sending a malicious Cisco Discovery Protocol
packet to an affected device. A successful exploit could allow the
attacker to exhaust system memory, causing the device to reload. Cisco
Discovery Protocol is a Layer 2 protocol. To exploit this
vulnerability, an attacker must be in the same broadcast domain as the
affected device (Layer 2 adjacent).

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-20200205-fxnxos-iosxr-cdp-dos
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3303b2ba");
  # http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?57837047");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:A/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:A/AC:L/PR:N/UI:N/S:U/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-2020-3120");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(190);

  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:"2023/07/25");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:13");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:14");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:9");
  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 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:nx-os:5.2" :
        {"versionEndIncluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:5.2%281%29sv3%284.1b%29" :
        {"versionEndExcluding" : "5.2%281%29sv3%284.1b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:5.2%281%29sv5%281.3%29" :
        {"versionEndExcluding" : "5.2%281%29sv5%281.3%29", "versionStartIncluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.2%2824%29" :
        {"versionEndExcluding" : "6.2%2824%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.2%2829%29" :
        {"versionEndExcluding" : "6.2%2829%29", "versionStartIncluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i7%288%29" :
        {"versionEndExcluding" : "7.0%283%29i7%288%29", "versionStartIncluding" : "7.0%283%29i", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3%286%29n1%281%29" :
        {"versionEndExcluding" : "7.3%286%29n1%281%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3%285%29d1%281%29" :
        {"versionEndExcluding" : "7.3%285%29d1%281%29", "versionStartIncluding" : "7.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.2%285%29" :
        {"versionEndExcluding" : "8.2%285%29", "versionStartIncluding" : "8.0", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.4%281a%29" :
        {"versionEndExcluding" : "8.4%281a%29", "versionStartIncluding" : "7.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.4%282%29" :
        {"versionEndExcluding" : "8.4%282%29", "versionStartIncluding" : "8.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:9.3%282%29" :
        {"versionEndExcluding" : "9.3%282%29", "versionStartIncluding" : "7.0%283%29f2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:13.2%289b%29" :
        {"versionEndExcluding" : "13.2%289b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:14.2%281j%29" :
        {"versionEndExcluding" : "14.2%281j%29", "versionStartIncluding" : "14.0", "family" : "NXOS"}
};

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