Cisco FXOS and NX-OS Software Authenticated Simple Network Management Protocol Denial of Service (CVE-2019-1963)

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

include('compat.inc');

if (description)
{
  script_id(501411);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/26");

  script_cve_id("CVE-2019-1963");

  script_name(english:"Cisco FXOS and NX-OS Software Authenticated Simple Network Management Protocol Denial of Service (CVE-2019-1963)");

  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 Simple Network Management Protocol (SNMP) input
packet processor of Cisco FXOS Software and Cisco NX-OS Software could
allow an authenticated, remote attacker to cause the SNMP application
on an affected device to restart unexpectedly. The vulnerability is
due to improper validation of Abstract Syntax Notation One
(ASN.1)-encoded variables in SNMP packets. An attacker could exploit
this vulnerability by sending a crafted SNMP packet to the SNMP daemon
on the affected device. A successful exploit could allow the attacker
to cause the SNMP application to restart multiple times, leading to a
system-level restart and a denial of service (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-20190828-fxnxos-snmp-dos
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?355e564b");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:L/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-2019-1963");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/08/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/28");
  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:6.2%2829%29" :
        {"versionEndExcluding" : "6.2%2829%29", "versionStartIncluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.4" :
        {"versionEndExcluding" : "8.4", "versionStartIncluding" : "7.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:13.2%287k%29" :
        {"versionEndExcluding" : "13.2%287k%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:14.0%282c%29" :
        {"versionEndExcluding" : "14.0%282c%29", "versionStartIncluding" : "14.0", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:14.1%281i%29" :
        {"versionEndExcluding" : "14.1%281i%29", "versionStartIncluding" : "14.1", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:9.2%283%29" :
        {"versionEndExcluding" : "9.2%283%29", "versionStartIncluding" : "7.0%283%29f", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.1%285%29n1%281b%29" :
        {"versionEndExcluding" : "7.1%285%29n1%281b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3%285%29n1%281%29" :
        {"versionEndExcluding" : "7.3%285%29n1%281%29", "versionStartIncluding" : "7.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.2%2822%29" :
        {"versionEndExcluding" : "6.2%2822%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.2%280%29d1%281%29" :
        {"versionEndExcluding" : "7.2%280%29d1%281%29", "versionStartIncluding" : "7.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.2%283%29" :
        {"versionEndExcluding" : "8.2%283%29", "versionStartIncluding" : "8.0", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.3%282%29" :
        {"versionEndExcluding" : "8.3%282%29", "versionStartIncluding" : "8.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:5.2%281%29sv3%284.1a%29" :
        {"versionEndExcluding" : "5.2%281%29sv3%284.1a%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:5.2" :
        {"versionEndExcluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:5.2%281%29sv5%281.2%29" :
        {"versionEndExcluding" : "5.2%281%29sv5%281.2%29", "versionStartIncluding" : "5.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i4%289%29" :
        {"versionEndExcluding" : "7.0%283%29i4%289%29", "versionStartIncluding" : "7.0%283%29i4", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i7%286%29" :
        {"versionEndExcluding" : "7.0%283%29i7%286%29", "versionStartIncluding" : "7.0%283%29i7", "family" : "NXOS"}
};

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