Siemens SCALANCE LPE9403 Authentication Bypass Using an Alternate Path or Channel (CVE-2025-40581)

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

include('compat.inc');

if (description)
{
  script_id(503296);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/01");

  script_cve_id("CVE-2025-40581");
  script_xref(name:"ICSA", value:"25-135-18");

  script_name(english:"Siemens SCALANCE LPE9403 Authentication Bypass Using an Alternate Path or Channel (CVE-2025-40581)");

  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 SCALANCE LPE9403
(6GK5998-3GS00-2AC2) (All versions with SINEMA Remote Connect Edge
Client installed). Affected devices are vulnerable to an
authentication bypass. This could allow a non-privileged local
attacker to bypass the authentication of the SINEMA Remote Connect
Edge Client, and to read and modify the configuration parameters.

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-327438.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-18");
  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:

- SCALANCE LPE9403 (6GK5998-3GS00-2AC2): Currently no fix is available
- SCALANCE LPE9403 (6GK5998-3GS00-2AC2)(CVE-2025-40572, CVE-2025-40573, CVE-2025-40574, CVE-2025-40579, CVE-2025-40580,
CVE-2025-40581, CVE-2025-40582, CVE-2025-40583): Restrict access to authorized and trusted personal only
- SCALANCE LPE9403 (6GK5998-3GS00-2AC2)(CVE-2025-40575, CVE-2025-40576, CVE-2025-40577, CVE-2025-40578): Disable the
Profinet Discovery and Configuration Protocol (DCP) service
- SCALANCE LPE9403 (6GK5998-3GS00-2AC2)(CVE-2025-40582): Only use trusted SINEMA Remote Connect Servers

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-327438 in HTML and CSAF.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-40581");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(288);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/05/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/24");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_lpe9403_firmware:-");
  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) 2025-2026 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:scalance_lpe9403_firmware:-" :
        {"family" : "SCALANCE", "orderNumbers" : ["6GK5998-3GS00-2AC2"]}
};

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