wu-ftpd ABOR privilege escalation

# SPDX-FileCopyrightText: 2004 David Maciejak
# 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:washington_university:wu-ftpd";

# Ref: David Greenman <dg at root dot com>

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.14301");
  script_version("2023-08-01T13:29:10+0000");
  script_tag(name:"last_modification", value:"2023-08-01 13:29:10 +0000 (Tue, 01 Aug 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_cve_id("CVE-1999-1326");
  script_xref(name:"OSVDB", value:"8718");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_name("wu-ftpd ABOR privilege escalation");
  script_category(ACT_GATHER_INFO);
  script_family("FTP");
  script_copyright("Copyright (C) 2004 David Maciejak");
  script_dependencies("gb_wu-ftpd_detect.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("wu-ftpd/installed");

  script_tag(name:"summary", value:"The remote Wu-FTPd server seems to be vulnerable to a remote privilege
  escalation.");

  script_tag(name:"insight", value:"This version contains a flaw that may allow a malicious user to gain
  access to unauthorized privileges.

  Specifically, there is a flaw in the way that the server handles an ABOR command after a data connection
  has been closed. The flaw is within the dologout() function and proper exploitation will give the
  remote attacker the ability to execute arbitrary code as the 'root' user.");

  script_tag(name:"impact", value:"This flaw may lead to a loss of confidentiality and/or integrity.");

  script_tag(name:"solution", value:"Upgrade to Wu-FTPd 2.4.2 or newer.");

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

  exit(0);
}

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

if( ! port = get_app_port( cpe:CPE ) ) exit( 0 );
if( ! vers = get_app_version( cpe:CPE, port:port ) ) exit( 0 );

if( egrep( pattern:"^(2\.([0-3]\.|4\.[01]))", string:vers ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"2.4.2" );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );