Jakub Wilk discovered that miniunzip in zlib-bin was affected by a directory traversal security vulnerability. An attacker could use this flaw to extract the contents of a specially crafted zip file to arbitrary locations.
For Debian 7 Wheezy, these problems have been fixed in version 1:1.2.7.dfsg-13+deb7u2.
We recommend that you upgrade your zlib packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/