CVE-2019-13161

An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and
15.x through 15.7.2, and 16.x through 16.4.0, and Certified Asterisk
through 13.21-cert3. A pointer dereference in chan_sip while handling SDP
negotiation allows an attacker to crash Asterisk when handling an SDP
answer to an outgoing T.38 re-invite. To exploit this vulnerability an
attacker must cause the chan_sip module to send a T.38 re-invite request to
them. Upon receipt, the attacker must send an SDP answer containing both a
T.38 UDPTL stream and another media stream containing only a codec (which
is not permitted according to the chan_sip configuration).

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931981&gt;