Vulnerability CVE-2016-9937


Published: 2016-12-12   Modified: 2016-12-13

Description:
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.

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Digium -> Asterisk 
Asterisk -> Opensource 

 References:
http://downloads.asterisk.org/pub/security/AST-2016-008-13.diff
http://downloads.asterisk.org/pub/security/AST-2016-008-14.diff
http://downloads.asterisk.org/pub/security/AST-2016-008.html
http://www.securityfocus.com/bid/94792
http://www.securitytracker.com/id/1037407
https://issues.asterisk.org/jira/browse/ASTERISK-26579

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