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CVE
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CVE-2016-9937Date: (C)2016-12-14   (M)2018-02-19


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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 5.0
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
SECTRACK-1037407
BID-94792
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
https://issues.asterisk.org/jira/browse/ASTERISK-26579

CPE    7
cpe:/a:digium:asterisk:14.0
cpe:/a:digium:asterisk:14.1.1
cpe:/a:digium:asterisk:14.1.2
cpe:/a:digium:asterisk:13.12
...
CWE    1
CWE-119

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