squirrelmail - various issues

Various vulnerabilities have been found in SquirrelMail, a webmail
application. The Common Vulnerabilities and Exposures project
identifies the following vulnerabilities:

• CVE-2010-4554
  SquirrelMail did not prevent page rendering inside a third-party
  HTML frame, which makes it easier for remote attackers to conduct
  clickjacking attacks via a crafted web site.
• CVE-2010-4555,
  CVE-2011-2752,
  CVE-2011-2753
  Multiple small bugs in SquirrelMail allowed an attacker to inject
  malicious script into various pages or alter the contents of user
  preferences.
• CVE-2011-2023
  It was possible to inject arbitrary web script or HTML via a
  crafted STYLE element in an HTML part of an e-mail message.

For the oldstable distribution (lenny), these problems have been fixed in
version 1.4.15-4+lenny5.

For the stable distribution (squeeze), these problems have been fixed in
version 1.4.21-2.

For the testing (wheezy) and unstable distribution (sid), these problems
have been fixed in version 1.4.22-1.

We recommend that you upgrade your squirrelmail packages.