Siemens SCALANCE W700 NULL Pointer Dereference (CVE-2023-28484)

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

include('compat.inc');

if (description)
{
  script_id(502899);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/14");

  script_cve_id("CVE-2023-28484");
  script_xref(name:"ICSA", value:"25-044-09");

  script_name(english:"Siemens SCALANCE W700 NULL Pointer Dereference (CVE-2023-28484)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"In libxml2 before 2.10.4, parsing of certain invalid XSD schemas can
lead to a NULL pointer dereference and subsequently a segfault. This
occurs in xmlSchemaFixupComplexType in xmlschemas.c.

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/html/ssa-398330.html");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-556635.pdf");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-625862.pdf");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-341067.pdf");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-769027.html");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109955177/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109955597/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109977720/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109954475/");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-25-044-09");
  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:

- All affected products: Update to V3.0.0 or later version

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To
operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens'
operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-769027 in HTML and CSAF.");
  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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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-2023-28484");

  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:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/02/24");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wab762-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wub762-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wub762-1_ifeatures_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1542sp-1_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1542sp-1_irc_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1543sp-1_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_firmware:3.1.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.5");
  script_set_attribute(attribute:"generated_plugin", value:"former");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2025-2026 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_s7-1500_cpu_firmware:3.1.5" :
        {"versionEndExcluding" : "3.1.5", "versionStartIncluding" : "3.1.0", "family" : "S71500", "orderNumbers" : ['6ES7518-4FX00-1AB0', '6ES7518-4AX00-1AB0', '6ES7518-4FX00-1AC0', '6ES7518-4AX00-1AC0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.5" :
        {"versionEndExcluding" : "3.1.5", "versionStartIncluding" : "3.1.0", "family" : "S71500", "orderNumbers" : ['6AG1518-4AX00-4AC0']},
    "cpe:/o:siemens:simatic_cp_1542sp-1_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "S71500", "orderNumbers" : ['6GK7542-6UX00-0XE0']},
    "cpe:/o:siemens:simatic_cp_1542sp-1_irc_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "S71500", "orderNumbers" : ['6GK7542-6VX00-0XE0']},
    "cpe:/o:siemens:simatic_cp_1543sp-1_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "S71500", "orderNumbers" : ['6GK7543-6WX00-0XE0']},
    "cpe:/o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "ET200", "orderNumbers" : ['6AG2542-6VX00-4XE0']},
    "cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "ET200", "orderNumbers" : ['6AG1543-6WX00-7XE0']},
    "cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:2.3" :
        {"versionEndExcluding" : "2.3", "family" : "ET200", "orderNumbers" : ['6AG2543-6WX00-4XE0']},
    "cpe:/o:siemens:scalance_wab762-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-6AA0']},
    "cpe:/o:siemens:scalance_wam763-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DA0']},
    "cpe:/o:siemens:scalance_wam763-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DC0']},
    "cpe:/o:siemens:scalance_wam763-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DC0']},
    "cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TA0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TC0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TB0']},
    "cpe:/o:siemens:scalance_wub762-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-1AA0']},
    "cpe:/o:siemens:scalance_wub762-1_ifeatures_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-2AA0']},
    "cpe:/o:siemens:scalance_wum763-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3AA0', '6GK5763-1AL00-3DA0']},
    "cpe:/o:siemens:scalance_wum763-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3DB0', '6GK5763-1AL00-3AB0']},
    "cpe:/o:siemens:scalance_wum766-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DC0']},
    "cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DB0']}
};

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