Jan Wagner uploaded new packages for icinga which fixed the following
security problems:

CVE-2012-6096
  CGI buffer overflows

  https://security-tracker.debian.org/tracker/CVE-2012-6096

For the squeeze-backports distribution the problems have been fixed in
version 1.7.1-5~bpo60+1 of the icinga package.

For the testing distribution (wheezy) these problems will be fixed soon.

For the unstable distribution (sid), these problems have been fixed in
version 1.7.1-5 of the icinga package.