Siemens SIMATIC S7-1500 Out-of-bounds Write (CVE-2025-68160)

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

include('compat.inc');

if (description)
{
  script_id(505145);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/16");

  script_cve_id("CVE-2025-68160");

  script_name(english:"Siemens SIMATIC S7-1500 Out-of-bounds Write (CVE-2025-68160)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Issue summary: Writing large, newline-free data into a BIO chain using
the line-buffering filter where the next BIO performs short writes can
trigger a heap-based out-of-bounds write.  Impact summary: This out-
of-bounds write can cause memory corruption which typically results in
a crash, leading to Denial of Service for an application.  The line-
buffering BIO filter (BIO_f_linebuffer) is not used by default in
TLS/SSL data paths. In OpenSSL command-line applications, it is
typically only pushed onto stdout/stderr on VMS systems. Third-party
applications that explicitly use this filter with a BIO chain that can
short-write and that write large, newline-free data influenced by an
attacker would be affected. However, the circumstances where this
could happen are unlikely to be under attacker control, and
BIO_f_linebuffer is unlikely to be handling non-curated data
controlled by an attacker. For that reason the issue was assessed as
Low severity.  The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not
affected by this issue, as the BIO implementation is outside the
OpenSSL FIPS module boundary.  OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1
and 1.0.2 are vulnerable to this issue.

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-265688.html");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-68160");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(787);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/04/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/13");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  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) 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_tm_mfp" :
        {"versionEndIncluding" : "1.1", "versionStartIncluding" : "1.1", "family" : "S71500", "orderNumbers": ["6ES7558-1AA00-0AB0"]}
};

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