Multiple directory traversal vulnerabilities in Lintian 1.23.x through 1.23.28, 1.24.x through 1.24.2.1, and 2.x before 2.3.2 allow remote attackers to overwrite arbitrary files or obtain sensitive information via vectors involving (1) control field names, (2) control field values, and (3) control files of patch systems.
http://www.ubuntu.com/usn/USN-891-1
http://www.debian.org/security/2010/dsa-1979
http://packages.qa.debian.org/l/lintian/news/20100128T015554Z.html