CVE-2016-9937: Buffer Overflow
First published: Mon Dec 12 2016(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Asterisk | =13.12 | |
| Asterisk | =13.13 | |
| Asterisk | =14.0 | |
| Asterisk | =14.1 | |
| Asterisk | =14.01 | |
| Asterisk | =14.1.1 | |
| Asterisk | =14.1.2 | |
| Asterisk | =14.02 | |
| Asterisk | =14.2 |
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Reference Links
- 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
Frequently Asked Questions
What is the severity of CVE-2016-9937?
CVE-2016-9937 is classified as a high severity vulnerability due to its potential to cause a denial of service.
How do I fix CVE-2016-9937?
To fix CVE-2016-9937, upgrade Asterisk to versions 13.13.1, 14.2.1 or later.
What software versions are affected by CVE-2016-9937?
CVE-2016-9937 affects Asterisk versions 13.12.x, 13.13.x before 13.13.1, and 14.x before 14.2.1.
What type of vulnerability is CVE-2016-9937?
CVE-2016-9937 is a parsing vulnerability related to the handling of the Opus codec in SDP offers and answers.
How does CVE-2016-9937 exploit the system?
CVE-2016-9937 exploits the system by causing recursive calls during parsing, ultimately leading to a crash.
- agent/references
- agent/type
- agent/remedy
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/author
- agent/severity
- agent/last-modified-date
- agent/event
- agent/description
- agent/first-publish-date
- agent/source
- collector/nvd-index
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- vendor/digium
- canonical/asterisk
- version/asterisk/13.12
- version/asterisk/13.13
- version/asterisk/14.0
- version/asterisk/14.1
- version/asterisk/14.01
- version/asterisk/14.1.1
- version/asterisk/14.1.2
- version/asterisk/14.02
- version/asterisk/14.2