AST-2016-004: Long Contact URIs in REGISTER requests can crash Asterisk

               Asterisk Project Security Advisory - AST-2016-004

Product Asterisk
Summary Long Contact URIs in REGISTER requests can crash
Nature of Advisory Remote Crash
Susceptibility Remote Authenticated Sessions
Severity Major
Exploits Known No
Reported On January 19, 2016
Reported By George Joseph
Posted On
Last Updated On February 10, 2016
Advisory Contact Mark Michelson <mmichelson AT digium DOT com>
CVE Name

Description Asterisk may crash when processing an incoming REGISTER
request if that REGISTER contains a Contact header with a
lengthy URI.

This crash will only happen for requests that pass
authentication. Unauthenticated REGISTER requests will not
result in a crash occurring.

This vulnerability only affects Asterisk when using PJSIP
as its SIP stack. The chan_sip module does not have this

Resolution Measures have been put in place to ensure that REGISTER
requests with long Contact URIs are rejected instead of
causing a crash.

Affected Versions
Product Release
Asterisk Open Source 11.x Unaffected
Asterisk Open Source 13.x All versions
Certified Asterisk 11.6 Unaffected
Certified Asterisk 13.1 All versions

Corrected In
Product Release
Asterisk Open Source 13.8.1
Certified Asterisk 13.1-cert5

SVN URL Revision


Asterisk Project Security Advisories are posted at

This document may be superseded by later versions; if so, the latest
version will be posted at and

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