See article at:
http://www.asteriskvoipnews.com/asterisk_releases/asterisk_1213_released_securityvulnerability_fix.html
Note that in addition to Asterisk 1.2.13, other upgrade files are Zaptel 1.2.10, Asterisk-Addons 1.2.5 and libpri 1.2.5.
Quick question: Assuming someone has a working system that started out as Trixbox, but where FreePBX has been upgraded to Version 2.1.3, would it cause anything to stop working if one were to install these Asterisk upgrades manually, using (for example) the instructions at http://nerdvittles.com/index.php?p=126, but of course substituting the current version numbers in the filenames? Or, would it be better to wait until a Trixbox upgrade is released that contains these upgrades? The concern is really that Asterisk and FreePBX keep working.