CVE-2017-17850

Description

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 72.18% Top 5%
Vendor Advisory gentoo.org Vendor Advisory asterisk.org Vendor Advisory asterisk.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://issues.asterisk.org/jira/browse/ASTERISK-27480 vendor advisory issue tracking
http://www.securitytracker.com/id/1040056 third party advisory vdb entry
https://security.gentoo.org/glsa/201811-11 vendor advisory
http://downloads.asterisk.org/pub/security/AST-2017-014.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-17850?
CVE-2017-17850 has been scored as a high severity vulnerability.
How to fix CVE-2017-17850?
To fix CVE-2017-17850, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-17850 being actively exploited in the wild?
It is possible that CVE-2017-17850 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~72% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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