Updated moodle package fixes security vulnerabilities:
Null characters were allowed in query strings in Moodle before 2.4.6, which caused sql statements to terminate and fail, potentially allowing sql injection in Moodle's SQL Server driver (CVE-2013-4313).
Links to external blogs were not being adequately cleaned in Moodle before 2.4.6, potentially allowing for XSS attacks (CVE-2013-4341).