Joomla 2.5.4 SQL Injection

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[ TITLE ....... ][ Joomla 2.5.4 with components/extensions I found @ webs  
[ DATE ........ ][ 07.04.2012  
[ AUTOHR ...... ][ http://hauntit.blogspot.com  
[ SOFT LINK ... ][ http://joomla.org  
[ VERSION ..... ][ 2.5.4  
[ TESTED ON ... ][ LAMP  
[ ----------------------------------------------------------------------- [  
  
[ 1. What is this?  
[ 2. What is the type of vulnerability?  
[ 3. Where is bug :)  
[ 4. More...  
  
[--------------------------------------------[  
[ 1. What is this?  
This is very nice CMS, You should try it! ;)  
  
[--------------------------------------------[  
[ 2. What is the type of vulnerability?  
  
When admin add 'the same content' twicely, then he will see an error similar to this:  
"Duplicate entry 'c9ujq(...)63rscpi5' for key 'PRIMARY' SQL=INSERT INTO `qcd3p_session` (`session_id`, `client_id`, `time`) VALUES ('c9u(...)i5', 1, '1338(...)88')"  
  
So now 'attacker' can find out what is the prefix of Your Joomla installation.  
In other way, this bug is available only from admin. ;)  
  
[--------------------------------------------[  
[ 3. Where is bug :)  
http://joomla/administrator/index.php?option=com_installer&view=update&task=%2bunion%2bselect%2bnull--.ajax  
  
[--------------------------------------------[  
[ 4. More...  
  
- http://www.joomla.org  
- http://hauntit.blogspot.com  
- http://www.google.com  
- http://portswigger.net  
  
* Why 'with friends' - because I added to my localhost Joomla installation so  
many extensions (to tests;)), so vulnerable could be else part of CMS too (for example:  
similar bug I found in latest VirtueMart 2.0.2. Check out at my blog. *  
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[ All questions about new projects @ mail now :)  
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[ Best regards  
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