UnrealIRCd Local Privilege Escalation Vulnerability

# SPDX-FileCopyrightText: 2017 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:unrealircd:unrealircd";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.811317");
  script_version("2023-07-25T05:05:58+0000");
  script_cve_id("CVE-2017-13649");
  script_tag(name:"cvss_base", value:"2.1");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");
  script_tag(name:"creation_date", value:"2017-08-31 14:02:54 +0530 (Thu, 31 Aug 2017)");
  script_name("UnrealIRCd Local Privilege Escalation Vulnerability");

  script_tag(name:"summary", value:"UnrealIRCd is prone to a local privilege escalation vulnerability.");

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

  script_tag(name:"insight", value:"The flaw exists due to error in handling
  of PID file. A PID file after dropping privileges to a non-root account, which
  might allow local users to kill arbitrary processes by leveraging access to
  this non-root account for PID file modification before a root script executes
  a 'kill cat /pathname' command.");

  script_tag(name:"impact", value:"Successful exploitation of this vulnerability
  will allow attackers to gain elevated privileges.");

  script_tag(name:"affected", value:"UnrealIRCd versions 4.0.13 and prior.");

  script_tag(name:"solution", value:"Please see the referenced bugreport for
  a workaround how to mitigate this issue within the used start scripts.");

  script_tag(name:"solution_type", value:"Workaround");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/100507");
  script_xref(name:"URL", value:"http://seclists.org/oss-sec/2017/q3/343");
  script_xref(name:"URL", value:"https://bugs.unrealircd.org/view.php?id=4990");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("gb_unrealircd_detect.nasl");
  script_mandatory_keys("UnrealIRCD/Detected");

  exit(0);
}

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

if(!UnPort = get_app_port(cpe:CPE)){
  exit(0);
}

if(!UnVer = get_app_version(cpe:CPE, port:UnPort)){
  exit(0);
}

if(version_is_less_equal(version:UnVer, test_version:"4.0.13"))
{
  report = report_fixed_ver(installed_version:UnVer, fixed_version:"Please see the solution tag for an available Workaround");
  security_message(data:report, port:UnPort);
  exit(0);
}
exit(0);