OpenSSH < 9.3p2 Vulnerability

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

include('compat.inc');

if (description)
{
  script_id(178910);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/27");

  script_cve_id("CVE-2023-38408");

  script_name(english:"OpenSSH < 9.3p2 Vulnerability");

  script_set_attribute(attribute:"synopsis", value:
"The SSH server running on the remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of OpenSSH installed on the remote host is prior to 9.3p2. It is, therefore, affected by a vulnerability as
referenced in the release-9.3p2 advisory.

  - Fix CVE-2023-38408 - a condition where specific libaries loaded via ssh-agent(1)'s PKCS#11 support could
    be abused to achieve remote code execution via a forwarded agent socket if the following (openssh-9.3p2-1)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.openssh.com/txt/release-9.3p2");
  script_set_attribute(attribute:"solution", value:
"Upgrade to OpenSSH 9.3p2 / 9.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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-2023-38408");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/07/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/07/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/26");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:openbsd:openssh");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("openssh_detect.nbin");
  script_require_keys("installed_sw/OpenSSH", "Settings/ParanoidReport");
  script_require_ports("Services/ssh", 22);

  exit(0);
}

include('backport.inc');
include('vcf.inc');
include('vcf_extras.inc');

var port = get_service(svc:'ssh', default:22, exit_on_fail:TRUE);
var app_info = vcf::openssh::get_app_info(app:'OpenSSH', port:port);

# only vuln if certain conditions are met, e.g. specific libraries exist on victim
if (report_paranoia < 2) audit(AUDIT_PARANOID);

vcf::check_all_backporting(app_info:app_info);

var constraints = [
  {'min_version': '3.0', 'fixed_version': '9.3p2', 'fixed_display': '9.3p2 / 9.4'}
];

vcf::openssh::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);