Asterisk SIP File Descriptor Exhaustion with chan_sip Session-Timers DoS (AST-2014-002)

This script is Copyright (C) 2014-2016 Tenable Network Security, Inc.

Synopsis :

A telephony application running on the remote host is affected by a
denial of service vulnerability.

Description :

According to the version in its SIP banner, the version of Asterisk
running on the remote host is potentially affected by a denial of
service vulnerability.

A denial of service flaw exists with the SIP INVITE request handling.
It is possible for a remote attacker to use all available file
descriptors using SIP INVITE requests. These file descriptors cannot be
released without restarting Asterisk, which could allow an attacker to
bypass intrusion detection systems.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.

See also :

Solution :

Upgrade to Asterisk / 11.8.1 / 12.1.1 / Certified Asterisk
1.8.15-cert5 / 11.6-cert2, or apply the appropriate patch listed in
the Asterisk advisory.

Risk factor :

Medium / CVSS Base Score : 4.3
CVSS Temporal Score : 3.6
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 73020 ()

Bugtraq ID: 66094

CVE ID: CVE-2014-2287

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