Cisco NX-OS Software NX-API Denial of Service (CVE-2019-1968)

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

include('compat.inc');

if (description)
{
  script_id(501382);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/26");

  script_cve_id("CVE-2019-1968");

  script_name(english:"Cisco NX-OS Software NX-API Denial of Service (CVE-2019-1968)");

  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 NX-API feature of Cisco NX-OS Software could
allow an unauthenticated, remote attacker to cause an NX-API system
process to unexpectedly restart. The vulnerability is due to incorrect
validation of the HTTP header of a request that is sent to the NX-API.
An attacker could exploit this vulnerability by sending a crafted HTTP
request to the NX-API on an affected device. A successful exploit
could allow the attacker to cause a denial of service (DoS) condition
in the NX-API service; however, the NX-OS device itself would still be
available and passing network traffic. Note: The NX-API feature is
disabled by default.

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-20190828-nxos-api-dos
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a91dc821");
  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:P");
  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: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-2019-1968");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(116);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/08/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/30");
  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:6.0%282%29a8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:6.1%282%29i2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:6.1%282%29i3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.0%283%29f");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.0%283%29i4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.0%283%29i7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:9.2");
  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:7.1" :
        {"versionEndIncluding" : "7.1", "versionStartIncluding" : "7.1", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.2" :
        {"versionEndIncluding" : "7.2", "versionStartIncluding" : "7.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3" :
        {"versionEndIncluding" : "7.3", "versionStartIncluding" : "7.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.0" :
        {"versionEndIncluding" : "8.0", "versionStartIncluding" : "8.0", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.1" :
        {"versionEndIncluding" : "8.1", "versionStartIncluding" : "8.1", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.2" :
        {"versionEndIncluding" : "8.2", "versionStartIncluding" : "8.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.3" :
        {"versionEndIncluding" : "8.3", "versionStartIncluding" : "8.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.1%282%29i2" :
        {"versionEndIncluding" : "6.1%282%29i2", "versionStartIncluding" : "6.1%282%29i2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.1%282%29i3" :
        {"versionEndIncluding" : "6.1%282%29i3", "versionStartIncluding" : "6.1%282%29i3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i4" :
        {"versionEndIncluding" : "7.0%283%29i4", "versionStartIncluding" : "7.0%283%29i4", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i7" :
        {"versionEndIncluding" : "7.0%283%29i7", "versionStartIncluding" : "7.0%283%29i7", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:9.2" :
        {"versionEndIncluding" : "9.2", "versionStartIncluding" : "9.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.0%282%29a8" :
        {"versionEndIncluding" : "6.0%282%29a8", "versionStartIncluding" : "6.0%282%29a8", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29f" :
        {"versionEndIncluding" : "7.0%283%29f", "versionStartIncluding" : "7.0%283%29f", "family" : "NXOS"}
};

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