Fixes the following security issues:
- AST-2020-001: Remote crash in res_pjsip_session
Upon receiving a new SIP Invite, Asterisk did not return the created
dialog locked or referenced.
- AST-2020-002: Outbound INVITE loop on challenge with different nonce
If Asterisk is challenged on an outbound INVITE and the nonce is changed
in each response, Asterisk will continually send INVITEs in a loop. This
causes Asterisk to consume more and more memory since the transaction will
never terminate (even if the call is hung up), ultimately leading to a
restart or shutdown of Asterisk. Outbound authentication must be
configured on the endpoint for this to occur.
For details, see the announcement:
https://www.asterisk.org/asterisk-news/asterisk-13-37-1-16-14-1-17-8-1-18-0-1-and-16-8-cert5-now-available-security/
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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