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CVE-2016-9937

Published: 12 December 2016

An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. This occurs as the code does not properly handle spaces separating the parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in chan_pjsip an SDP offer or answer is still processed and the crash occurs.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
asterisk
Launchpad, Ubuntu, Debian
upstream Not vulnerable
(1:13.12.2~dfsg-2)
precise Not vulnerable

trusty Does not exist
(trusty was not-affected)
xenial Not vulnerable

yakkety Not vulnerable

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H