Synology Router Manager (SRM) 1.2.x DoS Vulnerability (Synology-SA-20:11) - Unreliable Remote Version Check

# SPDX-FileCopyrightText: 2023 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:synology:router_manager";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.170498");
  script_version("2024-03-15T05:06:15+0000");
  script_tag(name:"last_modification", value:"2024-03-15 05:06:15 +0000 (Fri, 15 Mar 2024)");
  script_tag(name:"creation_date", value:"2023-06-19 08:33:05 +0000 (Mon, 19 Jun 2023)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-05-12 14:15:00 +0000 (Wed, 12 May 2021)");

  script_cve_id("CVE-2019-11823");

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

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

  script_name("Synology Router Manager (SRM) 1.2.x DoS Vulnerability (Synology-SA-20:11) - Unreliable Remote Version Check");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_synology_srm_consolidation.nasl");
  script_mandatory_keys("synology/srm/detected");

  script_tag(name:"summary", value:"Synology Router Manager (SRM) is prone to a denial of service
  (DoS) vulnerability.");

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

  script_tag(name:"insight", value:"A CRLF injection vulnerability in Network Center allows remote
  attackers to cause a denial of service (out-of-bounds read and application crash) via crafted
  network traffic.");

  script_tag(name:"affected", value:"SRM version 1.2.x prior to 1.2.3-8017-2.");

  script_tag(name:"solution", value:"Update to firmware version 1.2.3-8017-2 or later.");

  script_xref(name:"URL", value:"https://www.synology.com/en-global/security/advisory/Synology_SA_20_11");

  exit(0);
}

include("host_details.inc");
include("revisions-lib.inc");
include("version_func.inc");

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

# nb: The patch level version cannot be obtained so when the fix is on a patch level version (e.g.
# 1.1.5-6542-4 and not 1.1.5-6542), there will be 2 VTs with different qod_type.
if (version =~ "^1\.2\.3-8017" && (revcomp(a: version, b: "1.2.3-8017-2") < 0)) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.2.3-8017-2");
  security_message(port: 0, data: report);
  exit(0);
}

# nb: This is checked by VT 1.3.6.1.4.1.25623.1.0.170497
if (version =~ "^1\.1" && (revcomp(a: version, b: "1.2.3-8017") < 0))
  exit(0);

exit(99);