Siemens SICAM MMU, SICAM T, and SICAM SGU Authentication Bypass By Capture-Replay (CVE-2020-10045)

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

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

if (description)
{
  script_id(500399);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/04");

  script_cve_id("CVE-2020-10045");

  script_name(english:"Siemens SICAM MMU, SICAM T, and SICAM SGU Authentication Bypass By Capture-Replay (CVE-2020-10045)");

  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 SICAM MMU (All versions < V2.05), SICAM SGU (All versions), SICAM T (All versions
< V2.18). An error in the challenge-response procedure could allow an attacker to replay authentication traffic and gain
access to protected areas of the web application.  

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/pdf/ssa-305120.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-20-196-03");
  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 recommends applying updates, where available:

- SICAM MMU: Update to v2.05
- SICAM SGU: For RTU applications, upgrade the discontinued SICAM SGU devices to SICAM A8000 RTUs.
- SICAM T: Update to v2.18

Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:

- The firmware updates to SICAM T and SICAM MMU introduce authentication to the web application and remove some
unnecessary functionality. The web authentication functionality reduces the risk of access to the device’s web
application for executing administrative commands by unauthenticated users.
- Due to hardware constraints, encryption is not possible on the devices. Confidential data such as passwords handled by
the devices need to be protected on the network by other means, e.g., by VPN.
- The risk for remote code execution and unauthenticated firmware installation can be mitigated by ensuring encryption
and authentication between the user and the device, e.g., by VPN.
- Use a modern and up to date browser.

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

For additional information, please refer to Siemens Security Advisory SSA-305120");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-2020-10045");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(294);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/14");
  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:sicam_mmu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:sicam_sgu_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:sicam_t_firmware");
  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:sicam_mmu_firmware" :
        {"versionEndExcluding" : "2.05", "family" : "Sicam"},
    "cpe:/o:siemens:sicam_sgu_firmware:-" :
        {"family" : "Sicam"},
    "cpe:/o:siemens:sicam_t_firmware" :
        {"versionEndExcluding" : "2.18", "family" : "Sicam"}
};

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