p7zip - security update

Marcin Icewall Noga of Cisco Talos discovered an out-of-bound read
vulnerability in the CInArchive::ReadFileItem method in p7zip, a 7zr
file archiver with high compression ratio. A remote attacker can take
advantage of this flaw to cause a denial-of-service or, potentially the
execution of arbitrary code with the privileges of the user running
p7zip, if a specially crafted UDF file is processed.

For Debian 7 Wheezy, these problems have been fixed in version
9.20.1~dfsg.1-4+deb7u2.

We recommend that you upgrade your p7zip 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;