Asterisk Project Security Advisory - AST-2014-011 Product Asterisk Summary Asterisk Susceptibility to POODLE Vulnerability Nature of Advisory Unauthorized Data Disclosure Susceptibility Remote Unauthenticated Sessions Severity Medium Exploits Known No Reported On 16 October 2014 Reported By abelbeck Posted On 20 October 2014 Last Updated On October 20, 2014 Advisory Contact Matt Jordan CVE Name CVE-2014-3566 Description The POODLE vulnerability - described under CVE-2014-3566 - is described at https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3566. This advisory describes the Asterisk's project susceptibility to this vulnerability. The POODLE vulnerability consists of two issues: 1) A vulnerability in the SSL protocol version 3.0. This vulnerability has no known solution. 2) The ability to force a fallback to SSLv3 when a TLS connection is negotiated. Asterisk is susceptible to both portions of the vulnerability in different places. 1) The res_jabber and res_xmpp module both use SSLv3 exclusively, and are hence susceptible to POODLE. 2) The core TLS handling, used by the chan_sip channel driver, Asterisk Manager Interface (AMI), and the Asterisk HTTP server, defaults to allowing SSLv3/SSLv2 fallback. This allows a MITM to potentially force a connection to fallback to SSLv3, exposing it to the POODLE vulnerability. Resolution Asterisk has been patched such that it no longer uses SSLv3 for the res_jabber/res_xmpp modules. Additionally, when the encryption method is not specified, the default handling in the TLS core no longer allows for a fallback to SSLv3 or SSLv2. 1) Users of Asterisk's res_jabber or res_xmpp modules should upgrade to the versions of Asterisk specified in this advisory. 2) Users of Asterisk's chan_sip channel driver, AMI, and HTTP server may set the "tlsclientmethod" or "sslclientmethod" to "tlsv1" to force TLSv1 as the only allowed encryption method. Alternatively, they may also upgrade to the versions of Asterisk specified in this advisory. Users of Asterisk are encouraged to NOT specify "sslv2" or "sslv3". Doing so will now emit a WARNING. Affected Versions Product Release Series Asterisk Open Source 1.8.x All versions Asterisk Open Source 11.x All versions Asterisk Open Source 12.x All versions Certified Asterisk 1.8.28 All versions Certified Asterisk 11.6 All versions Corrected In Product Release Asterisk Open Source 1.8.31.1, 11.13.1, 12.6.1 Certified Asterisk 1.8.28-cert2, 11.6-cert7 Patches SVN URL Revision http://downloads.asterisk.org/pub/security/AST-2014-011-1.8.diff Asterisk 1.8 http://downloads.asterisk.org/pub/security/AST-2014-011-11.diff Asterisk 11 http://downloads.asterisk.org/pub/security/AST-2014-011-12.diff Asterisk 12 http://downloads.asterisk.org/pub/security/AST-2014-011-1.8.28.diff Certified Asterisk 1.8.28 http://downloads.asterisk.org/pub/security/AST-2014-011-11.6.diff Certified Asterisk 11.6 Links https://issues.asterisk.org/jira/browse/ASTERISK-24425 Asterisk Project Security Advisories are posted at http://www.asterisk.org/security This document may be superseded by later versions; if so, the latest version will be posted at http://downloads.digium.com/pub/security/AST-2014-011.pdf and http://downloads.digium.com/pub/security/AST-2014-011.html Revision History Date Editor Revisions Made October 19 Matt Jordan Initial Revision Asterisk Project Security Advisory - AST-2014-011 Copyright (c) 2014 Digium, Inc. All Rights Reserved. Permission is hereby granted to distribute and publish this advisory in its original, unaltered form.