Due to an issue with the Windows binary allowing any user to read or execute the contents of a file directly from the PHP binary, we have delayed the 4.1.2 release of PHP for Windows to allow for this fix. This release also fixes the file upload security problem.
With this new release, we introduce 2 new php.ini settings, which MUST be set to make the binary work. It's worth noting, at this point, that this particular fix only applies to the CGI binary. The SAPI module will still work as expected, and it's use is encouraged.
The new settings are:
It is known that Apache (any version) and iPlanet servers are vulnerable to this issue, however Microsoft IIS is not. Since cgi.force_redirect takes a value of either 1 or 0, (on or off) you should set it to 1 if you are running Apache or iPlanet servers, and to 0 for IIS. If you are unsure of which you need, set it to 1 and see if your scripts execute. You will need to stop and restart your server when you change your php.ini file, for the changes to have effect.
If cgi.force_redirect is turned on, and you are not running under Apache or Netscape (iPlanet) web servers, you MAY need to set an environment variable name that PHP will look for to know it is OK to continue execution. Setting this variable MAY cause security issues, so check what you are doing first.
More information can be found here relating to the form upload exploit that caused the release of 4.1.2 initially.