OpenWRT < 18.06.8, 19.x < 19.07.2 ppp Vulnerability

# Copyright (C) 2022 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
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CPE = "cpe:/a:openwrt:openwrt";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.148626");
  script_version("2022-08-23T10:11:31+0000");
  script_tag(name:"last_modification", value:"2022-08-23 10:11:31 +0000 (Tue, 23 Aug 2022)");
  script_tag(name:"creation_date", value:"2022-08-23 06:56:09 +0000 (Tue, 23 Aug 2022)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/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:"2020-08-11 19:15:00 +0000 (Tue, 11 Aug 2020)");

  script_cve_id("CVE-2020-8597");

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

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

  script_name("OpenWRT < 18.06.8, 19.x < 19.07.2 ppp Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2022 Greenbone Networks GmbH");
  script_family("Buffer overflow");
  script_dependencies("gb_openwrt_ssh_login_detect.nasl");
  script_mandatory_keys("openwrt/detected");

  script_tag(name:"summary", value:"OpenWRT is prone to a buffer overflow vulnerability in ppp.");

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

  script_tag(name:"insight", value:"A remotely exploitable vulnerability was found in
  Point-to-Point Protocol Daemon (pppd), which has a significant potential impact due to the
  possibility of remote code execution prior to authentication.");

  script_tag(name:"affected", value:"OpenWRT version 18.06.7 and prior and version 19.x through
  19.07.1.");

  script_tag(name:"solution", value:"Update to version 18.06.8, 19.07.2 or later.");

  script_xref(name:"URL", value:"https://openwrt.org/advisory/2020-02-21-1");

  exit(0);
}

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

if (!version = get_app_version(cpe: CPE, nofork: TRUE))
  exit(0);

if (version_is_less(version: version, test_version: "18.06.8")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "18.06.8");
  security_message(port: 0, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "19.0", test_version2: "19.07.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "19.07.2");
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);