Siemens SIMATIC S7-1500 Improper Input Validation(CVE-2025-38457)

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

include('compat.inc');

if (description)
{
  script_id(505303);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/24");

  script_cve_id("CVE-2025-38457");

  script_name(english:"Siemens SIMATIC S7-1500 Improper Input Validation(CVE-2025-38457)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"In the Linux kernel, the following vulnerability has been resolved:
net/sched: Abort __tc_modify_qdisc if parent class does not exist
Lion's patch [1] revealed an ancient bug in the qdisc API.  Whenever a
user creates/modifies a qdisc specifying as a parent another  qdisc,
the qdisc API will, during grafting, detect that the user is  not
trying to attach to a class and reject. However grafting is  performed
after qdisc_create (and thus the qdiscs' init callback) is  executed.
In qdiscs that eventually call qdisc_tree_reduce_backlog  during init
or change (such as fq, hhf, choke, etc), an issue  arises. For
example, executing the following commands:    sudo tc qdisc add dev lo
root handle a: htb default 2  sudo tc qdisc add dev lo parent a:
handle beef fq    Qdiscs such as fq, hhf, choke, etc unconditionally
invoke  qdisc_tree_reduce_backlog() in their control path init() or
change() which  then causes a failure to find the child class;
however, that does not stop  the unconditional invocation of the
assumed child qdisc's qlen_notify with  a null class. All these qdiscs
make the assumption that class is non-null.    The solution is ensure
that qdisc_leaf() which looks up the parent  class, and is invoked
prior to qdisc_create(), should return failure on  not finding the
class.  In this patch, we leverage qdisc_leaf to return ERR_PTRs
whenever the  parentid doesn't correspond to a class, so that we can
detect it  earlier on and abort before qdisc_create is called.    [1] 
https://lore.kernel.org/netdev/d912cbd7-193b-4269-9857-
[email protected]/

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-082556.html");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-38457");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/23");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  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");
  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_cpu_firmware:3.1.5" :
        {"versionStartIncluding" : "3.1.5", "family" : "S71500", "orderNumbers" : ['6ES7518-4AX00-1AB0', '6ES7518-4FX00-1AB0', '6ES7518-4AX00-1AC0', '6ES7518-4FX00-1AC0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware" :
        {"family" : "S71500", "orderNumbers" : ['6AG1518-4AX00-4AC0']}
};

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