Multiple directory traversal vulnerabilities in dpkg-source in dpkg-dev 1.3.0 allow remote attackers to modify files outside of the intended directories via a source package with a crafted Index: pseudo-header in conjunction with (1) missing --- and +++ header lines or (2) a +++ header line with a blank pathname.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=749183
http://www.ubuntu.com/usn/USN-2242-1