Easily exploitable Pseudo Random Number generator in phpbb version 2.0.19 and under.

I. DESCRIPTION

Easily exploitable Pseudo Random Number generator in phpbb version 2.0.19 and under.

II. DETAILS

Due to poor design the gen_rand_string() can only generate upto 1 million hashes or random strings. This
allow an attacker to reset any account through the lost password request form by "predicting" the
validation id and the new password for the account. Worst case scenario (for the attacker) is that he will
have to send 1 million requests to reset the password and 1 million requests to get the new password.

For more info visit http://www.r-security.net/tutorials/view/readtutorial.php?id=4