AST-2012-010: Possible Resource Leak On Uncompleted Re-invite Transactions

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Asterisk Project Security Advisory – AST-2012-010

Product Asterisk
Summary Possible resource leak on uncompleted re-invite
Nature of Advisory Denial of Service
Susceptibility Remote authenticated sessions
Severity Minor
Exploits Known No
Reported On June 13, 2012
Reported By Steve Davies
Posted On July 5, 2012
Last Updated On July 5, 2012
Advisory Contact Terry Wilson

Description If Asterisk sends a re-invite and an endpoint responds to
the re-invite with a provisional response but never sends a
final response, then the SIP dialog structure is never
freed and the RTP ports for the call are never released. If
an attacker has the ability to place a call, they could
create a denial of service by using all available RTP

Resolution A re-invite that receives a provisional response without a
final response is detected and properly cleaned up at

Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 10.x All versions
Asterisk Business Edition C.3.x All versions
Certified Asterisk 1.8.11-certx All versions
Asterisk Digiumphones 10.x.x-digiumphones All versions

Corrected In
Product Release
Asterisk Open Source, 10.5.2
Asterisk Business Edition C.3.7.5
Certified Asterisk 1.8.11-cert4
Asterisk Digiumphones 10.5.2-digiumphones

URL Revision Asterisk
1.8 Asterisk


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This document may be superseded by later versions; if so, the latest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

Revision History
Date Editor Revisions Made
06/27/2012 Terry Wilson Initial Release

Asterisk Project Security Advisory – AST-2012-010
Copyright (c) 2012 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.