Siemens SIMATIC S7-1500 TM MFP BIOS NULL Pointer Dereference (CVE-2021-42376)

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

include('compat.inc');

if (description)
{
  script_id(502973);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/14");

  script_cve_id("CVE-2021-42376");
  script_xref(name:"ICSA", value:"23-166-10");

  script_name(english:"Siemens SIMATIC S7-1500 TM MFP BIOS NULL Pointer Dereference (CVE-2021-42376)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A NULL pointer dereference in Busybox's hush applet leads to denial of
service when processing a crafted shell command, due to missing
validation after a \x03 delimiter character. This may be used for DoS
under very rare conditions of filtered command input.

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-565386.pdf");
  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://cert-portal.siemens.com/productcert/pdf/ssa-831302.pdf");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109815650/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109945851/");
  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-23-166-10");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-42376");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(476);

  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:"2025/02/25");

  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:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28eu%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28eu%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28eu%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28us%29_firmware:2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_tm_mfp");
  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:scalance_wam763-1_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_%28eu%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28eu%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TA0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TB0']},
    "cpe:/o:siemens:scalance_wum763-1_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3AA0', '6GK5763-1AL00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_%28eu%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_%28us%29_firmware:2.0" :
        {"versionEndExcluding" : "2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DB0']},
    "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']},
    "cpe:/o:siemens:simatic_s7-1500_tm_mfp" :
        {"versionEndExcluding" : "1.3", "family" : "S71500", "orderNumbers": ["6ES7558-1AA00-0AB0"]}
};

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