Synopsis :

The version of Asterisk installed on the remote host may be 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 vulnerability
that could allow a remote attacker to crash the server. This issue
could be exploited when the attacker has a valid SCCP (Skinny) ID and
closes a connection when in certain call states. A null pointer is
left behind and can cause the server to crash when the pointer is
later dereferenced.

See also :

https://issues.asterisk.org/jira/browse/ASTERISK-19905
http://downloads.asterisk.org/pub/security/AST-2012-008.html

Solution :

Upgrade to Asterisk 1.8.12.1 / 10.4.1 / 1.8.11-cert-2 or apply the
patches listed in the Asterisk advisory.

Risk factor :

Low / CVSS Base Score : 3.5
(CVSS2#AV:N/AC:M/Au:S/C:N/I:N/A:P)
CVSS Temporal Score : 2.6
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false