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php5 (5.4.4-14+deb7u9) stable; urgency=medium

* The default PHP FPM socket permission has been changed from 0666
to 0660 to mitigate security vulnerability (CVE-2014-0185) in PHP
FPM that allowed any local user to run a PHP code under the active
user of FPM process via crafted FastCGI client.

The default Debian setup now correctly sets the listen.owner and
listen.group to www-data:www-data in default php-fpm.conf. If you
have more FPM instances or a webserver not running under www-data
user you need to adjust the configuration of FPM pools in
/etc/php5/fpm/p­ool.d/ so the accessing process has rights to
access the socket.

-- Ondřej Surý Mon, 12 May 2014 14:23:05 +0200