Debian: DSA-4085-3 Essential File System Safeguards for Node.js

The previous update for php5, DSA-3074-1, introduced regression in the
sessionclean cron script. The change was intended to fix a potential
symlink attack using filenames including the NULL character (Debian bug
#766147), but depended on sed package version too recent, not in Wheezy.

This update reverts the fix, so people are advised to keep kernel
symlink protection (sysctl fs.protected_symlinks=1) enabled as it is by
default on Wheezy, which is enough to prevent successful exploitation.

For the stable distribution (wheezy), this problem has been fixed in
version 5.4.35-0+deb7u2.

We recommend that you upgrade your php5 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/