Siemens SIMATIC S7-1500 Uncontrolled Resource Consumption (CVE-2019-19281)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(500362);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2019-19281");
  script_xref(name:"ICSA", value:"20-042-11");

  script_name(english:"Siemens SIMATIC S7-1500 Uncontrolled Resource Consumption (CVE-2019-19281)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability has been identified in SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All
versions >= V2.5 and < V20.8), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions
>= V2.5 and < V2.8), SIMATIC S7-1500 Software Controller (All versions >= V2.5 and < V20.8). Affected devices contain a
vulnerability that allows an unauthenticated attacker to trigger a Denial-of-Service condition. The vulnerability can be
triggered if specially crafted UDP packets are sent to the device. The security vulnerability could be exploited by an
attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user
interaction. An attacker could use the vulnerability to compromise the device availability.  

This plugin only works
with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-750824.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.us-cert.gov/ics/advisories/icsa-20-042-11");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.

Siemens has released updates for several affected products and recommends specific workarounds and mitigations that
customers can apply to reduce the risk:

- Restrict network access to affected devices.
- For SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants), Siemens recommends users update to v20.8
(v2x.8 corresponds to v2.8 of the S7-1500 CPU firmware).

- For SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants), Siemens recommends users update to v2.8
- For SIMATIC S7-1500 Software Controller, Siemens recommends users update to v20.8 (v2x.8 corresponds to v2.8 of the
S7-1500 CPU firmware).

For more information on this vulnerability and associated software updates, please see Siemens security advisory
SSA-750824");
  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: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-2019-19281");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(400);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/07");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1511-1_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1513-1_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1515-2_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1516-3_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1516-3_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1517-3_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1517-3_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1507s_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1508s_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1507s_f_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1508s_f_firmware");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

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

var vuln_cpes = {
    "cpe:/o:siemens:simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware" :
        {"versionEndExcluding" : "20.8", "versionStartIncluding" : "2.5", "family" : "ET200SP"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1511-1_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1513-1_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1515-2_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1516-3_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1516-3_dp_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1517-3_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1517-3_dp_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_pn_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_dp_firmware" :
        {"versionEndExcluding" : "2.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1507s_firmware" :
        {"versionEndExcluding" : "20.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1508s_firmware" :
        {"versionEndExcluding" : "20.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1507s_f_firmware" :
        {"versionEndExcluding" : "20.8", "versionStartIncluding" : "2.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_cpu_1508s_f_firmware" :
        {"versionEndExcluding" : "20.8", "versionStartIncluding" : "2.5", "family" : "S71500"}
};

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