An issue with quoting has been found when invoking ed. In order to avoid this, ed is now directly started instead of calling a shell which starts ed.
For Debian 7 Wheezy, these problems have been fixed in version 2.6.1-3+deb7u3.
We recommend that you upgrade your patch packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/