Synology DSM Use of a Broken or Risky Cryptographic Algorithm (CVE-2020-27653)

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

include('compat.inc');

if (description)
{
  script_id(502814);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/23");

  script_cve_id("CVE-2020-27653");

  script_name(english:"Synology DSM Use of a Broken or Risky Cryptographic Algorithm (CVE-2020-27653)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Algorithm downgrade vulnerability in QuickConnect in Synology DiskStation
Manager (DSM) before 6.2.3_25426 allows man-in-the-middle attackers to
spoof servers and obtain sensitive information via unspecified
vectors.

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://www.synology.com/security/advisory/Synology_SA_20_14");
  # https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1061
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e65a4948");
  script_set_attribute(attribute:"see_also", value:"https://www.synology.com/security/advisory/Synology_SA_20_14");
  # https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1061
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e65a4948");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-27653");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(327);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/01/22");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:synology:diskstation_manager:6.2.3_25426");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Synology");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Synology');

var asset = tenable_ot::assets::get(vendor:'Synology');

var vuln_cpes = {
    "cpe:/o:synology:diskstation_manager:6.2.3_25426" :
        {"versionEndIncluding" : "6.2.3_25426", "versionStartIncluding" : "6.2.3_25426", "family" : "DiskStation"}
};

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