Asterisk Information Disclosure (AST-2014-011) (POODLE)

Medium Nessus Plugin ID 78623

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VPR Score: 5.6

Synopsis

A telephony application running on the remote host is affected by an information disclosure vulnerability.

Description

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by an error related to the way SSL 3.0 handles padding bytes when decrypting messages encrypted using block ciphers in cipher block chaining (CBC) mode. A man-in-the-middle attacker can decrypt a selected byte of a cipher text in as few as 256 tries if they are able to force a victim application to repeatedly send the same data over newly created SSL 3.0 connections. This is also known as the 'POODLE' issue.

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

Solution

Upgrade to Asterisk 1.8.31.1 / 11.13.1 / 12.6.1 / 1.8.28-cert2 / 11.6-cert7 or apply the appropriate patch listed in the Asterisk advisory.

See Also

http://downloads.asterisk.org/pub/security/AST-2014-011.html

https://issues.asterisk.org/jira/browse/ASTERISK-24425

https://www.openssl.org/news/secadv/20141015.txt

https://www.openssl.org/news/vulnerabilities.html

https://www.imperialviolet.org/2014/10/14/poodle.html

https://www.openssl.org/~bodo/ssl-poodle.pdf

https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00

Plugin Details

Severity: Medium

ID: 78623

File Name: asterisk_ast_2014_011.nasl

Version: 1.16

Type: remote

Family: Misc.

Published: 2014/10/22

Updated: 2018/06/27

Dependencies: 63202

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 5.6

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: asterisk/sip_detected, Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2014/10/20

Vulnerability Publication Date: 2014/10/14

Reference Information

CVE: CVE-2014-3566

BID: 70574

CERT: 577193