wu-ftpd - missing input sanitising

Several denial of service conditions have been discovered in wu-ftpd,
the popular FTP daemon. The Common Vulnerabilities and Exposures
project identifies the following problems:

• CAN-2005-0256
  Adam Zabrocki discovered a denial of service condition in wu-ftpd
  that could be exploited by a remote user and cause the server to
  slow down by resource exhaustion.

• CAN-2003-0854
  Georgi Guninski discovered that /bin/ls may be called from within
  wu-ftpd in a way that will result in large memory consumption and
  hence slow down the server.

For the stable distribution (woody) these problems have been fixed in
version 2.6.2-3woody5.

For the unstable distribution (sid) these problems have been fixed in
version 2.6.2-19.

We recommend that you upgrade your wu-ftpd package.