Siemens SCALANCE, RUGGEDCOM Third-Party Improper Input Validation (CVE-2021-26401)

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

include('compat.inc');

if (description)
{
  script_id(503283);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/08");

  script_cve_id("CVE-2021-26401");
  script_xref(name:"ICSA", value:"23-075-01");

  script_name(english:"Siemens SCALANCE, RUGGEDCOM Third-Party Improper Input Validation (CVE-2021-26401)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate
CVE-2017-5715 on some AMD CPUs.

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-419740.pdf");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/document/109817007/");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-23-075-01");
  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 identified the following specific workarounds and mitigations users can apply to reduce risk: 
- Update all of the affected products to v7.2 or later version or the software.

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate 
mechanisms. To operate the devices in a protected IT environment, Siemens recommends users configure the environment 
according to Siemens' operational guidelines for Industrial Security, and to follow the recommendations in the product 
manuals. Additional information on Industrial Security by Siemens can be found on the Siemens page for Industrial 
Security.

For further inquiries on security vulnerabilities in Siemens products and solutions, contact the Siemens ProductCERT. 
For more information, see the associated Siemens security advisory SSA-419740 in HTML and CSAF.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-26401");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/03/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/03/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/08");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_eu_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_nam_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m804pb_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_a%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_b%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_a%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_b%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m826-2_shdsl-router_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m874-2_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m874-3_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m876-3_%28evdo%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m876-3_%28rok%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m876-4_%28eu%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m876-4_%28nam%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_m876-4_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_mum853-1_%28eu%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_mum856-1_%28eu%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_mum856-1_%28row%29_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_s615_eec_firmware:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_s615_firmware:7.2");
  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) 2025 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:ruggedcom_rm1224_lte%284g%29_eu_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "RuggedCom", "orderNumbers" : ['6GK6108-4AM00-2BA2']},
    "cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_nam_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "RuggedCom", "orderNumbers" : ['6GK6108-4AM00-2DA2']},
    "cpe:/o:siemens:scalance_m804pb_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5804-0AP00-2AA2']},
    "cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_a%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5812-1AA00-2AA2']},
    "cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_b%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5812-1BA00-2AA2']},
    "cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_a%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5816-1AA00-2AA2']},
    "cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_b%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5816-1BA00-2AA2']},
    "cpe:/o:siemens:scalance_m826-2_shdsl-router_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5826-2AB00-2AB2']},
    "cpe:/o:siemens:scalance_m874-2_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5874-2AA00-2AA2']},
    "cpe:/o:siemens:scalance_m874-3_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5874-3AA00-2AA2']},
    "cpe:/o:siemens:scalance_m876-3_%28evdo%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5876-3AA02-2BA2']},
    "cpe:/o:siemens:scalance_m876-3_%28rok%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5876-3AA02-2EA2']},
    "cpe:/o:siemens:scalance_m876-4_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5876-4AA10-2BA2']},
    "cpe:/o:siemens:scalance_m876-4_%28eu%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5876-4AA00-2BA2']},
    "cpe:/o:siemens:scalance_m876-4_%28nam%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5876-4AA00-2DA2']},
    "cpe:/o:siemens:scalance_mum853-1_%28eu%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5853-2EA00-2DA1']},
    "cpe:/o:siemens:scalance_mum856-1_%28eu%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5856-2EA00-3DA1']},
    "cpe:/o:siemens:scalance_mum856-1_%28row%29_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCEM", "orderNumbers" : ['6GK5856-2EA00-3AA1']},
    "cpe:/o:siemens:scalance_s615_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCES", "orderNumbers" : ['6GK5615-0AA00-2AA2']},
    "cpe:/o:siemens:scalance_s615_eec_firmware:7.2" :
        {"versionEndExcluding" : "7.2", "family" : "SCALANCES", "orderNumbers" : ['6GK5615-0AA01-2AA2']}
};

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