Dropbear < 2016.74 Multiple Vulnerabilities

# SPDX-FileCopyrightText: 2016 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:dropbear_ssh_project:dropbear_ssh";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106381");
  script_version("2025-09-02T05:39:48+0000");
  script_tag(name:"last_modification", value:"2025-09-02 05:39:48 +0000 (Tue, 02 Sep 2025)");
  script_tag(name:"creation_date", value:"2016-11-10 14:18:45 +0700 (Thu, 10 Nov 2016)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-03-04 23:00:00 +0000 (Sat, 04 Mar 2017)");

  script_cve_id("CVE-2016-7406", "CVE-2016-7407", "CVE-2016-7408", "CVE-2016-7409");

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

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

  script_name("Dropbear < 2016.74 Multiple Vulnerabilities");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("General");
  script_dependencies("gb_dropbear_consolidation.nasl");
  script_mandatory_keys("dropbear_ssh/detected");

  script_tag(name:"summary", value:"Dropbear is prone to multiple vulnerabilities.");

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

  script_tag(name:"insight", value:"The following flaws exist:

  - CVE-2016-7406: Message printout was vulnerable to format string injection. A dbclient user who
  can control username or host arguments could potentially run arbitrary code as the dbclient user.

  - CVE-2016-7407: dropbearconvert import of OpenSSH keys could run arbitrary code as the local
  dropbearconvert user when parsing malicious key files.

  - CVE-2016-7408: dbclient could run arbitrary code as the local dbclient user if particular -m
  or -c arguments are provided.

  - CVE-2016-7409: bclient or dropbear server could expose process memory to the running user if
  compiled with DEBUG_TRACE and running with -v.");

  script_tag(name:"impact", value:"An authenticated attacker may run arbitrary code.");

  script_tag(name:"affected", value:"Dropbear versions 2016.73 and prior.");

  script_tag(name:"solution", value:"Update to version 2016.74 or later.");

  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2016/09/14/7");

  exit(0);
}

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

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

if (version_is_less(version: vers, test_version: "2016.74")) {
  report = report_fixed_ver(installed_version: vers, fixed_version: "2016.74", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);