OpenBSD OpenSSH 8.7p1 - 8.8p1 RCE Vulnerability

# SPDX-FileCopyrightText: 2024 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:openbsd:openssh";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.114696");
  script_version("2025-01-13T08:32:03+0000");
  script_tag(name:"last_modification", value:"2025-01-13 08:32:03 +0000 (Mon, 13 Jan 2025)");
  script_tag(name:"creation_date", value:"2024-07-09 07:11:01 +0000 (Tue, 09 Jul 2024)");
  script_tag(name:"cvss_base", value:"6.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:P/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2024-07-08 18:15:09 +0000 (Mon, 08 Jul 2024)");

  script_cve_id("CVE-2024-6409");

  script_tag(name:"qod_type", value:"remote_banner_unreliable");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("OpenBSD OpenSSH 8.7p1 - 8.8p1 RCE Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2024 Greenbone AG");
  script_family("General");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_tag(name:"summary", value:"OpenBSD OpenSSH is prone to a remote code execution (RCE)
  vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"There is a possible RCE in privsep child due to a race condition
  in signal handling when call cleanup_exit() from grace_alarm_handler(). Please see the references
  for more information.");

  script_tag(name:"affected", value:"OpenBSD OpenSSH versions 8.7p1 through 8.8p1 when distribution
  specific patches have been applied. Known affected distributions are RHEL 9 and Fedora 35 through
  Fedora 37.");

  script_tag(name:"solution", value:"Update to a newer OpenSSH version which doesn't make the
  problematic cleanup_exit() call.");

  script_xref(name:"URL", value:"http://www.openwall.com/lists/oss-security/2024/07/08/2");
  script_xref(name:"URL", value:"https://access.redhat.com/security/cve/CVE-2024-6409");
  script_xref(name:"URL", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2295085");

  exit(0);
}

include("version_func.inc");
include("host_details.inc");

if (isnull(port = get_app_port(cpe: CPE)))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_in_range(version: version, test_version: "8.7p1", test_version2: "8.8p1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "See references", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);