Rock Stevens, Andrew Ruef and Marcin Icewall Noga discovered a
heap-based buffer overflow vulnerability in the zip_read_mac_metadata
function in libarchive, a multi-format archive and compression library,
which may lead to the execution of arbitrary code if a user or automated
system is tricked into processing a specially crafted ZIP file.

For the stable distribution (jessie), this problem has been fixed in
version 3.1.2-11+deb8u1.

We recommend that you upgrade your libarchive packages.