Asterisk Multiple Vulnerabilities (AST-2016-001 - AST-2016-003) (BEAST)

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


Synopsis :

A telephony application running on the remote host is affected by
multiple vulnerabilities.

Description :

According to its SIP banner, the version of Asterisk running on the
remote host is affected by the following vulnerabilities :

- An information disclosure vulnerability, known as BEAST,
exists in the SSL 3.0 and TLS 1.0 protocols due to a
flaw in the way the initialization vector (IV) is
selected when operating in cipher-block chaining (CBC)
modes. A man-in-the-middle attacker can exploit this
to obtain plaintext HTTP header data, by using a
blockwise chosen-boundary attack (BCBA) on an HTTPS
session, in conjunction with JavaScript code that uses
the HTML5 WebSocket API, the Java URLConnection API,
or the Silverlight WebClient API. (CVE-2011-3389)

- An integer overflow condition exists in sip.conf due to
improper validation of user-supplied input when handling
'timert1' values. A remote attacker can exploit this to
cause a denial of service. (VulnDB 134040)

- An unspecified flaw exists due to improper handling of
FAT data in UDPTL packets. A remote attacker can exploit
this to cause a denial of service. (VulnDB 134041)

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

See also :

http://downloads.asterisk.org/pub/security/AST-2016-001.html
http://downloads.asterisk.org/pub/security/AST-2016-002.html
http://downloads.asterisk.org/pub/security/AST-2016-003.html
https://www.imperialviolet.org/2011/09/23/chromeandbeast.html

Solution :

Upgrade to Asterisk version 11.21.1 / 13.7.1 / 11.6-cert12 /
13.1-cert3. Alternatively, apply the appropriate patch referenced in
the vendor advisories.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 88715 ()

Bugtraq ID: 49778
82651
82656
82670

CVE ID: CVE-2011-3389

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