Synology DiskStation Manager Improper Restriction of Operations within the Bounds of a Memory Buffer (CVE-2021-26561)

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

include('compat.inc');

if (description)
{
  script_id(502467);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/10/01");

  script_cve_id("CVE-2021-26561");

  script_name(english:"Synology DiskStation Manager Improper Restriction of Operations within the Bounds of a Memory Buffer (CVE-2021-26561)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Stack-based buffer overflow vulnerability in synoagentregisterd in
Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-
the-middle attackers to execute arbitrary code via syno_finder_site
HTTP header.

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_26");
  # https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1159
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3181628f");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-26561");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(119, 121);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/02/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/10/01");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:synology:diskstation_manager");
  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) 2024 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:/a:synology:diskstation_manager" :
        {"versionEndExcluding" : "6.2.3-25426-3", "versionStartIncluding" : "6.2", "family" : "DiskStation"}
};

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