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 either 13.x prior to 13.8.1 or 13.1-cert prior to
13.1-cert5. It is, therefore, affected by a flaw in PJProject due to a
failure to close TCP connections after receiving new ones. An
unauthenticated, remote attacker can exploit this, by opening multiple
connections without sending data, to exhaust the number of allowed TCP
connections, resulting in a denial of service condition.
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 13.8.1 / 13.1-cert5, or apply the
appropriate patch according to the Asterisk advisory.
Risk factor :
Medium / CVSS Base Score : 5.0
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