CVE-2017-17850 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://downloads.asterisk.org/pub/security/AST-2017-014.html http://www.securitytracker.com/id/1040056 https://issues.asterisk.org/jira/browse/ASTERISK-27480 https://security.gentoo.org/glsa/201811-11

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5