CVE-2017-17850

HIGH

Asterisk < 13.18.4, < 14.7.4, < 15.1.4, and < 13.18-cert1 - Denial of Service via Missing Contact Header in SIP Messages

Title source: llm
STIX 2.1

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.

References (4)

Core 4
Core References
Issue Tracking, Vendor Advisory x_refsource_confirm
https://issues.asterisk.org/jira/browse/ASTERISK-27480
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040056
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/201811-11

Scores

CVSS v3 7.5
EPSS 0.7535
EPSS Percentile 99.5%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-20
Status published
Products (3)
digium/asterisk 13.0.0 - 13.18.4
digium/certified_asterisk 13.1.0 (3 CPE variants)
digium/certified_asterisk 13.8 cert1
Published Dec 27, 2017
Tracked Since Feb 18, 2026