Veeam Backup and Replication 13.x < 13.0.1.2067 Multiple Vulnerabilities (KB4738 / KB4831)

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

include('compat.inc');

if (description)
{
  script_id(303202);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/23");

  script_cve_id(
    "CVE-2026-21669",
    "CVE-2026-21670",
    "CVE-2026-21671",
    "CVE-2026-21672",
    "CVE-2026-21708",
    "CVE-2026-21709"
  );
  script_xref(name:"IAVA", value:"2026-A-0244");

  script_name(english:"Veeam Backup and Replication 13.x < 13.0.1.2067 Multiple Vulnerabilities (KB4738 / KB4831)");

  script_set_attribute(attribute:"synopsis", value:
"The version of Veeam Backup and Replication installed on the remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Veeam Backup and Replication installed on the remote Windows host is prior to 13.0.1.2067. It is,
therefore, affected by multiple vulnerabilities:

  - A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup
    Server. (CVE-2026-21669)

  - A vulnerability allowing a low-privileged user to extract saved SSH credentials. (CVE-2026-21670)

  - A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code
    execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication. (CVE-2026-21671)

  - A vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.
    (CVE-2026-21672)

  - A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
    (CVE-2026-21708)

  - A vulnerability allowing a local attacker with administrator privileges to bypass Windows Driver Signature
    Enforcement. (CVE-2026-21709)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.veeam.com/kb4738");
  script_set_attribute(attribute:"see_also", value:"https://www.veeam.com/kb4831");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Veeam Backup and Replication version 13.0.1.2067 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  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:L/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-2026-21669");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-21670");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:veeam:backup_and_replication");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("veeam_backup_and_replication_win_installed.nbin");
  script_require_keys("SMB/Registry/Enumerated", "installed_sw/Veeam Backup and Replication");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Veeam Backup and Replication', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version':'13.0', 'fixed_version':'13.0.1.2067'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:result);