This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.
A telephony application running on the remote host is affected by a
denial of service vulnerability.
According to its SIP banner, the version of Asterisk running on the
remote host is 13.10.x prior to 13.11.1. It is, therefore, affected by
a NULL pointer dereference flaw due to improper handling of ACK
packets from an unknown username. An unauthenticated, remote attacker
can exploit this to crash the program, resulting in a denial of
service. This vulnerability only affects installations using the PJSIP
stack; installations using chan_sip are unaffected.
Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.
See also :
Upgrade to Asterisk version 13.11.1.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.1
Public Exploit Available : true