Kosmas Skiadopoulos discovered a serious security vulnerability [0] in the
CGI SAPI of PHP version 4.3.0. PHP [1] contains code for preventing direct
access to the CGI binary with configure option
"--enable-force-cgi-redirect" and php.ini option "cgi.force_redirect". In
PHP 4.3.0 there is a bug which renders these options useless. Please note
that this bug does NOT affect any of the other SAPI modules such as the
Apache or ISAPI modules.
Anyone with access to websites hosted on a web server which employs the CGI
module may exploit this vulnerability to gain access to any file readable
by the user under which the webserver runs. A remote attacker could also
trick PHP into executing arbitrary PHP code if attacker is able to inject
the code into files accessible by the CGI. This could be for example the
web server access-logs.
