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Critical Security at Joomla 1.5.X before 1.5.6 Version

Two day ago, Our Official website has defaced by some one, They change layout our official website with another picture.
i have investigate, the hole is from Joomla software where our office use to built website.

to recover that's hole we must edited joomla source code at :
File : /components/com_user/models/reset.php

Line: 111-130
{1} - Replace ' with empty char
{3} - If you enter ' in token field then query will be looks like : "SELECT id FROM jos_users WHERE block = 0 AND activation = '' "

that's smart solution, than upgrade to higher joomla version.
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