libarchive - security update

It was found that libarchive mishandled hardlink archive entries of
non-zero data size, possibly allowing remote attackers to to write to
arbitrary files via especially crafted archives.

For Debian 7 Wheezy, these problems have been fixed in version
3.0.4-3+wheezy4.

We recommend that you upgrade your libarchive packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;