Siemens S7-300/400 PLC (CVE-2016-9159)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(500306);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/13");

  script_cve_id("CVE-2016-9159");

  script_name(english:"Siemens S7-300/400 PLC (CVE-2016-9159)");

  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 SIMATIC S7-300 CPU family (All versions), SIMATIC S7-300 CPU family (incl.
related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS
variants) (All versions), SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 V6
and earlier CPU family (All versions), SIMATIC S7-400 V7 CPU family (All versions), SIMATIC S7-410 V8 CPU family (All
versions), SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) (All versions). An attacker with network access to port
102/tcp (ISO-TSAP) or via Profibus could obtain credentials from the PLC if protection-level 2 is configured on the
affected devices.  

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:"http://www.securityfocus.com/bid/94820");
  script_set_attribute(attribute:"see_also", value:"https://ics-cert.us-cert.gov/advisories/ICSA-16-348-05");
  script_set_attribute(attribute:"see_also", value:"http://www.securitytracker.com/id/1037434");
  # https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-731239.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e53c5d06");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-731239.pdf");
  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 provides the following firmware versions to resolve CVE-2016-9158:

- SIMATIC S7-300 CPU family: Update to v3.X.14
- SIMATIC S7-400 PN v6: Update to v6.0.6
- SIMATIC S7-400 v7 CPU family: Update to v7.0.2
- SIMATIC S7-410 v8 CPU family: Update to v8.2

Siemens also recommends the following mitigations:

- Deactivate the web server. 
- Apply Protection-Level 3 read/write protection.
- Apply cell protection concept.
- Apply defense-in-depth strategies.
- Use VPN for protecting network communication between cells.
- For SIMATIC S7-CPU 410 CPUs: Activate Field Interface Security in PCS 7 V9.0 and use a CP 443-1 Adv. to communicate
with ES/OS in order to mitigate vulnerability 2 (CVE-2016-9159).

Siemens strongly recommends users protect network access with appropriate mechanisms (e.g., firewalls, segmentation,
VPN). Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines
for Industrial Security.

For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security
Advisory SSA-731239.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-9159");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(200);

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/07");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-400_pn%2fdp_v6_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-400_pn%2fdp_v7_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-410_v8_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) 2022-2024 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_s7-300_cpu_firmware:-" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-400_pn%2fdp_v7_firmware:-" :
        {"versionStartIncluding" : "7.0", "versionEndIncluding" : "7.x", "family" : "S7400"},
    "cpe:/o:siemens:simatic_s7-400_pn%2fdp_v6_firmware:-" :
        {"versionStartIncluding" : "6.0", "versionEndIncluding" : "6.x", "family" : "S7400"},
    "cpe:/o:siemens:simatic_s7-410_v8_firmware" :
        {"versionStartIncluding" : "8.0", "versionEndExcluding" : "8.2", "family" : "S7400"}
};

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