High severity · published Dec 12, 2016
CVE-2016-9937
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
7.5
CVSS
2.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
13.12; 13.13; 14.0; 14.1; 14.01; 14.1.1; +3 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-9937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-9937
Patch
http://downloads.asterisk.org/pub/security/AST-2016-008-13.diff
Patch
http://downloads.asterisk.org/pub/security/AST-2016-008-14.diff
Patch
http://downloads.asterisk.org/pub/security/AST-2016-008.html
Third Party Advisory
http://www.securityfocus.com/bid/94792
www.securitytracker.com
http://www.securitytracker.com/id/1037407
Patch
https://issues.asterisk.org/jira/browse/ASTERISK-26579
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