asterisk -- Unauthorized data disclosure and shell access command injection in app_minivm

The Asterisk project reports:

AST-2017-005 - A change was made to the strict RTP
support in the RTP stack to better tolerate late media
when a reinvite occurs. When combined with the symmetric
RTP support this introduced an avenue where media could
be hijacked. Instead of only learning a new address when
expected the new code allowed a new source address to be
learned at all times.
AST-2017-006 - The app_minivm module has an “externnotify”
program configuration option that is executed by the
MinivmNotify dialplan application. The application uses
the caller-id name and number as part of a built string
passed to the OS shell for interpretation and execution.
Since the caller-id name and number can come from an
untrusted source, a crafted caller-id name or number
allows an arbitrary shell command injection.