QPopper Username Information Disclosure

# SPDX-FileCopyrightText: 2004 Scott Shebby
# 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.12279");
  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_xref(name:"URL", value:"http://www.securityfocus.com/bid/7110");
  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("QPopper Username Information Disclosure");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2004 Scott Shebby");
  script_family("General");
  script_dependencies("popserver_detect.nasl");
  script_require_ports("Services/pop3", 110, 995);
  script_mandatory_keys("pop3/qpopper/detected");

  script_tag(name:"summary", value:"The remote server appears to be running a version of QPopper
  that is older than 4.0.6.");

  script_tag(name:"impact", value:"Versions older than 4.0.6 are vulnerable to a bug where remote
  attackers can enumerate valid usernames based on server responses during the authentication process.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since the disclosure
  of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer
  release, disable respective features, remove the product or replace the product by another one.");

  script_tag(name:"solution_type", value:"WillNotFix");
  script_tag(name:"qod_type", value:"remote_banner");

  exit(0);
}

include("pop3_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

port = pop3_get_port(default:110);
banner = pop3_get_banner(port:port);
if(!banner || "Qpopper" >!< banner)
  exit(0);

if(ereg(pattern:".*Qpopper.*version ([0-3]\.*|4\.0\.[0-5][^0-9]).*", string:banner, icase:TRUE)){
  security_message(port:port);
  exit(0);
}

exit(99);