apt - several vulnerabilities

Two vulnerabilities have been discovered in APT, the well-known dpkg
frontend. The Common Vulnerabilities and Exposures project identifies
the following problems:

• CVE-2009-1300
  In time zones where daylight savings time occurs at midnight,
  the apt cron.daily script fails, stopping new security updates
  from being applied automatically.
• CVE-2009-1358
  A repository that has been signed with an expired or revoked
  OpenPGP key would still be considered valid by APT.

For the old stable distribution (etch), these problems have been fixed in
version 0.6.46.4-0.1+etch1.

For the stable distribution (lenny), these problems have been fixed in
version 0.7.20.2+lenny1.

For the unstable distribution (sid), these problems have been fixed in
version 0.7.21.

We recommend that you upgrade your apt package.