<div dir="ltr"><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Asterisk Security Team</b> <span dir="ltr"><<a href="mailto:security@asterisk.org">security@asterisk.org</a>></span><br>Date: 2016-02-03 23:59 GMT-02:00<br>Subject: [asterisk-dev] AST-2016-002: File descriptor exhaustion in chan_sip<br>To: <a href="mailto:asterisk-dev@lists.digium.com">asterisk-dev@lists.digium.com</a><br><br><br> Asterisk Project Security Advisory - AST-2016-002<br>
<br>
Product Asterisk<br>
Summary File descriptor exhaustion in chan_sip<br>
Nature of Advisory Denial of Service<br>
Susceptibility Remote Unauthenticated Sessions<br>
Severity Minor<br>
Exploits Known Yes<br>
Reported On September 17, 2015<br>
Reported By Alexander Traud<br>
Posted On February 3, 2016<br>
Last Updated On February 3, 2016<br>
Advisory Contact Richard Mudgett <rmudgett AT digium DOT com><br>
CVE Name Pending<br>
<br>
Description Setting the sip.conf timert1 value to a value higher than<br>
1245 can cause an integer overflow and result in large<br>
retransmit timeout times. These large timeout values hold<br>
system file descriptors hostage and can cause the system to<br>
run out of file descriptors.<br>
<br>
Resolution Setting the sip.conf timert1 value to 1245 or lower will not<br>
exhibit the vulnerability. The default timert1 value is 500.<br>
Asterisk has been patched to detect the integer overflow and<br>
calculate the previous retransmission timer value.<br>
<br>
Affected Versions<br>
Product Release<br>
Series<br>
Asterisk Open Source 1.8.x All versions<br>
Asterisk Open Source 11.x All versions<br>
Asterisk Open Source 12.x All versions<br>
Asterisk Open Source 13.x All versions<br>
Certified Asterisk 1.8.28 All versions<br>
Certified Asterisk 11.6 All versions<br>
Certified Asterisk 13.1 All versions<br>
<br>
Corrected In<br>
Product Release<br>
Asterisk Open Source 11.21.1, 13.7.1<br>
Certified Asterisk 11.6-cert12, 13.1-cert3<br>
<br>
Patches<br>
SVN URL Revision<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-1.8.28.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-1.8.28.diff</a> Certified<br>
Asterisk<br>
1.8.28<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-11.6.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-11.6.diff</a> Certified<br>
Asterisk<br>
11.6<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-13.1.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-13.1.diff</a> Certified<br>
Asterisk<br>
13.1<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-1.8.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-1.8.diff</a> Asterisk<br>
1.8<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-11.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-11.diff</a> Asterisk<br>
11<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-12.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-12.diff</a> Asterisk<br>
12<br>
<a href="http://downloads.asterisk.org/pub/security/AST-2016-002-13.diff" rel="noreferrer" target="_blank">http://downloads.asterisk.org/pub/security/AST-2016-002-13.diff</a> Asterisk<br>
13<br>
<br>
Links <a href="https://issues.asterisk.org/jira/browse/ASTERISK-25397" rel="noreferrer" target="_blank">https://issues.asterisk.org/jira/browse/ASTERISK-25397</a><br>
<br>
Asterisk Project Security Advisories are posted at<br>
<a href="http://www.asterisk.org/security" rel="noreferrer" target="_blank">http://www.asterisk.org/security</a><br>
<br>
This document may be superseded by later versions; if so, the latest<br>
version will be posted at<br>
<a href="http://downloads.digium.com/pub/security/AST-2016-002.pdf" rel="noreferrer" target="_blank">http://downloads.digium.com/pub/security/AST-2016-002.pdf</a> and<br>
<a href="http://downloads.digium.com/pub/security/AST-2016-002.html" rel="noreferrer" target="_blank">http://downloads.digium.com/pub/security/AST-2016-002.html</a><br>
<br>
Revision History<br>
Date Editor Revisions Made<br>
September 29, 2015 Richard Mudgett Initial document created<br>
<br>
Asterisk Project Security Advisory - AST-2016-002<br>
Copyright (c) 2015 Digium, Inc. All Rights Reserved.<br>
Permission is hereby granted to distribute and publish this advisory in its<br>
original, unaltered form.<br>
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