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Email Injection

There are a lot of ways to send anonymous emails, some use it to mass mail, some use it to spoof identity, and some (a few) use it to send email anonymously. Usually a web mailform using the mail() function generates emails containing headers with the originating IP of the server it's running on. Therefore the mailform acts as a SMTP proxy. The input fields of the form may vary, but it is common to specify a mailform that gives you control over the subject, the message, and the sender's email address.

Function usage : mail([RECIPIENT],[SUBJECT],[MESSAGE],[EXTRAHEADERS],[EXTRAPARAMS]);


In this context, the target is to be able to send anonymous emails to other recipients. There are numerous additional fields that can be specified in the mail headers (see [ RFC 822 ]). For example 'Cc' (Carbon Copy), which sends a copy of the message to the email addresses given as arguments. A better choice is to use the 'Bcc' (Blind Carbon Copy) which sends a carbon copy of the message just like with the 'Cc' header, except that the recipiends email addresses given as arguments are not shown to the multiple recipients' headers. As specified in the [ RFC 822 ], one must add a line feed for every header. The <LF> (line feed) char has a hexadecimal value of 0x0A.

Thus by providing the following values to the example script of this article : -
Sender : <blocquote> "sender@anonymous.www%0ACc:recipient@someothersite.xxx%0ABcc:somebloke@grrrr.xxx,someotherbloke@oooops.xxx" </blocquote>
"ahem" </blocquote> - Message : <blocquote> "My Message..."
</blocquote>

Now The Raw email data will look like
To: recipient@victim.xxx
Subject: ahem
From: sender@anonymous.xxx
Cc:recipient@someothersite.xxx
Bcc:somebloke@grrrr.xxx,someotherbloke@oooops.xxx
My Message...



Let's keep the same value for subject and message, and give the following value to the sender : email@anonymous.xxx%0ATo:email1@who.xxx
the mail output is :
To: recipient@victim.xxx
Subject: Hum
From: email@anonymous.xxx
To:email1@who.xxx
My Message...


Repeating the 'To' header won't be a problem, the mail will be sent to recipient@victim.xxx AND email1@who.xxx.

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Assignment 01(Enroll TO Offensive-Security Course)

Steps 1:download the page.
2:open fc4.js in your favourite editor and add following lines in it or just replace it with vode given below.
3:then open the download html file in browser and fill the form with your email and a garbage value string.
4:thats it? it will show you the real security string??
yeah but  ...theirs another challenge waiting for you ... :D

function fc4me(srvstr) {

   if(!document.pleazfc4me.email.value || !document.pleazfc4me.securitystring.value) {
      alert("Please fill in all the required fields!");
      return false;
   }
   else {
      document.pleazfc4me.submit();
    }
   var t=hexMD5("\x74\x72\x79\x68\x61\x72\x64\x65\x72"+srvstr)
alert(t)
document.write(t)
}



Finally Got In :-)