icedove - several

• CVE-2011-2372
  Mariusz Mlynski discovered that websites could open a download
  dialog — which has open as the default action —, while a user
  presses the ENTER key.
• CVE-2011-2995
  Benjamin Smedberg, Bob Clary and Jesse Ruderman discovered crashes
  in the rendering engine, which could lead to the execution of
  arbitrary code.
• CVE-2011-2998
  Mark Kaplan discovered an integer underflow in the JavaScript
  engine, which could lead to the execution of arbitrary code.
• CVE-2011-2999
  Boris Zbarsky discovered that incorrect handling of the
  window.location object could lead to bypasses of the same-origin
  policy.
• CVE-2011-3000
  Ian Graham discovered that multiple Location headers might lead to
  CRLF injection.

As indicated in the Lenny (oldstable) release notes, security support for
the Icedove packages in the oldstable needed to be stopped before the end
of the regular Lenny security maintenance life cycle.
You are strongly encouraged to upgrade to stable or switch to a different
mail client.

For the stable distribution (squeeze), this problem has been fixed in
version 3.0.11-1+squeeze5.

For the unstable distribution (sid), this problem has been fixed in
version 3.1.15-1.

We recommend that you upgrade your icedove packages.