WordPress-MU wp-login.php Security Bypass Vulnerability

Summary
The host is running WordPres-MU and is prone to Security Bypass vulnerability.
Impact
Attackers can exploit this issue to bypass security restrictions and change the administrative password. Impact Level: Application
Solution
Update to Version 2.8.4 http://mu.wordpress.org/download/
Insight
The flaw is due to an error in the wp-login.php script password reset mechanism which can be exploited by passing an array variable in a resetpass (aka rp) action.
Affected
WordPress-MU version prior to 2.8.4 on all running platform.
References