Asterisk Project Security Advisory - AST-2014-010 Product Asterisk Summary Remote crash when handling out of call message in certain dialplan configurations Nature of Advisory Remotely triggered crash of Asterisk Susceptibility Remote authenticated sessions Severity Minor Exploits Known No Reported On 05 September 2014 Reported By Philippe Lindheimer Posted On 18 September 2014 Last Updated On September 18, 2014 Advisory Contact Matt Jordan <mjordan AT digium DOT com> CVE Name Pending Description When an out of call message - delivered by either the SIP or PJSIP channel driver or the XMPP stack - is handled in Asterisk, a crash can occur if the channel servicing the message is sent into the ReceiveFax dialplan application while using the res_fax_spandsp module. Note that this crash does not occur when using the res_fax_digium module. While this crash technically occurs due to a configuration issue, as attempting to receive a fax from a channel driver that only contains textual information will never succeed, the likelihood of having it occur is sufficiently high as to warrant this advisory. Resolution The fax family of applications have been updated to handle the Message channel driver correctly. Users using the fax family of applications along with the out of call text messaging features are encouraged to upgrade their versions of Asterisk to the versions specified in this security advisory. Additionally, users of Asterisk are encouraged to use a separate dialplan context to process text messages. This avoids issues where the Message channel driver is passed to dialplan applications that assume a media stream is available. Note that the various channel drivers and stacks provide such an option; an example being the SIP channel driver's outofcall_message_context option. Affected Versions Product Release Series Asterisk Open Source 11.x All versions Asterisk Open Source 12.x All versions Certified Asterisk 11.6 All versions Corrected In Product Release Asterisk Open Source 11.12.1, 12.5.1 Certified Asterisk 11.6-cert6 Patches SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2014-010-11.6.diff Certified Asterisk
Links https://issues.asterisk.org/jira/browse/ASTERISK-24301 Asterisk Project Security Advisories are posted at http://www.asterisk.org/security This document may be superseded by later versions; if so, the latest version will be posted at http://downloads.digium.com/pub/security/AST-2014-010.pdf and http://downloads.digium.com/pub/security/AST-2014-010.html Revision History Date Editor Revisions Made September 18 Matt Jordan Initial Draft Asterisk Project Security Advisory - AST-2014-010 Copyright (c) 2014 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its original, unaltered form.