AST-2016-002: File descriptor exhaustion in chan_sip

               Asterisk Project Security Advisory - AST-2016-002

Product Asterisk
Summary File descriptor exhaustion in chan_sip
Nature of Advisory Denial of Service
Susceptibility Remote Unauthenticated Sessions
Severity Minor
Exploits Known Yes
Reported On September 17, 2015
Reported By Alexander Traud
Posted On February 3, 2016
Last Updated On February 3, 2016
Advisory Contact Richard Mudgett <rmudgett AT digium DOT com>
CVE Name Pending

Description Setting the sip.conf timert1 value to a value higher than
1245 can cause an integer overflow and result in large
retransmit timeout times. These large timeout values hold
system file descriptors hostage and can cause the system to
run out of file descriptors.

Resolution Setting the sip.conf timert1 value to 1245 or lower will not
exhibit the vulnerability. The default timert1 value is 500.
Asterisk has been patched to detect the integer overflow and
calculate the previous retransmission timer value.

Affected Versions
Product Release
Asterisk Open Source 1.8.x All versions
Asterisk Open Source 11.x All versions
Asterisk Open Source 12.x All versions
Asterisk Open Source 13.x All versions
Certified Asterisk 1.8.28 All versions
Certified Asterisk 11.6 All versions
Certified Asterisk 13.1 All versions

Corrected In
Product Release
Asterisk Open Source 11.21.1, 13.7.1
Certified Asterisk 11.6-cert12, 13.1-cert3

SVN URL Revision Certified
1.8.28 Certified
11.6 Certified
13.1 Asterisk
1.8 Asterisk
11 Asterisk
12 Asterisk


Asterisk Project Security Advisories are posted at

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