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

CVE-2014-6610

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.diff

Asterisk 11

http://downloads.asterisk.org/pub/security/AST-2014-010-12.diff

Asterisk 12

http://downloads.asterisk.org/pub/security/AST-2014-010-11.6.diff

Certified Asterisk 11.6

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

18 September, 2014

Matt Jordan

Initial Draft

18 September, 2014

Matt Jordan

Added CVE