CVE-2019-18790

Description

An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.

How to fix CVE-2019-18790

To remediate CVE-2019-18790, upgrade the affected package to a fixed version below.

• —upgrade to 16.3.0-r3 or later
• —upgrade to 1:16.10.0~dfsg-1 or later

Is CVE-2019-18790 being exploited?

Moderate — EPSS is 7.4%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 16.3.0-r3
• from 0, < 1:16.10.0~dfsg-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-18790
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-18790