Siemens SIPROTEC 5 Devices Improper Input Validation (CVE-2021-41769)

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

include('compat.inc');

if (description)
{
  script_id(500843);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/04");

  script_cve_id("CVE-2021-41769");

  script_name(english:"Siemens SIPROTEC 5 Devices Improper Input Validation (CVE-2021-41769)");

  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 SIPROTEC 5 6MD85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 6MD86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 6MD89 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 6MU85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7KE85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SA82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SA86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SA87 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SD82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SD86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SD87 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SJ81 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SJ82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SJ85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SJ86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SK82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SK85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SL82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7SL86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SL87 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SS85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7ST85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7SX85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7UM85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7UT82 devices (CPU
variant CP100) (All versions < V8.83), SIPROTEC 5 7UT85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7UT86 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7UT87 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7VE85 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 7VK87 devices (CPU
variant CP300) (All versions < V8.83), SIPROTEC 5 Compact 7SX800
devices (CPU variant CP050) (All versions < V8.83). An improper input
validation vulnerability in the web server could allow an
unauthenticated user to access device information.

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-439673.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-22-013-04");
  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 recommends updating to v8.83 or later versions

Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented
procedures made available with the product. If supported by the product, an automated means to apply the security
updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security
update, and supervision by trained staff of the update process in the target environment.

As a general security measure Siemens strongly recommends protecting network access with appropriate mechanisms (e.g.,
firewalls, segmentation, VPN). Siemens also encourages users to configure the environment according to Siemens
operational guidelines for industrial security in order to run the devices in a protected IT environment.

Siemens also recommends following security guidelines for Digital Grid Products.

For additional information, please refer to Siemens Security Advisory SSA-439673");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  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:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-41769");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/01/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/01/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/02/28");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:6md85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:6md86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:6md89_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:6mu85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ke85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sa82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sa86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sa87_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sd82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sd86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sd87_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sj82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sj85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sj86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sk82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sk85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sl82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sl86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7sl87_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ss85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7st85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7um85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ut82_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ut85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ut86_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ut87_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7ve85_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:7vk87_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2024 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:6md85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:6md86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:6md89_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:6mu85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ke85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sa82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sa86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sa87_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sd82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sd86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sd87_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sj82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sj85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sj86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sk82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sk85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sl82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sl86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7sl87_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ss85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7st85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7um85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ut82_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ut85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ut86_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ut87_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7ve85_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"},
    "cpe:/o:siemens:7vk87_firmware" :
        {"versionEndExcluding" : "8.83", "family" : "Siprotec5"}
};

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