Emil Lerner, beched and d90pwn found a buffer underflow in php5-fpm, a Fast Process Manager for the PHP language, which can lead to remote code execution.
Instances are vulnerable depending on the web server configuration, in particular PATH_INFO handling. For a full list of preconditions, check: https://github.com/neex/phuip-fpizdam
For Debian 7 Wheezy, these problems have been fixed in version 5.4.45-0+deb7u25.
We recommend that you upgrade your php5 packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/