spamassassin -- Nefarious rule configuration files can run system commands

The Apache SpamAssassin project reports:

A nefarious rule configuration (.cf) files can be configured to
run system commands. This issue is less stealthy and attempts to
exploit the issue will throw warnings.
Thanks to Damian Lukowski at credativ for reporting the issue
ethically. With this bug unpatched, exploits can be injected in a
number of scenarios though doing so remotely is difficult. In
addition to upgrading to SA 3.4.4, we again recommend that users
should only use update channels or 3rd party .cf files from trusted
places.