CVE-2019-18790

moderate-risk
Published 2019-11-22

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.

Do I need to act?

~
7.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (9)

Affected Vendors

Debian Digium

References (8)

Patch http://downloads.asterisk.org/pub/security/AST-2019-006.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/11/msg00038.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
Vendor Advisory https://www.asterisk.org/downloads/security-advisories
Patch http://downloads.asterisk.org/pub/security/AST-2019-006.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/11/msg00038.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
Vendor Advisory https://www.asterisk.org/downloads/security-advisories
49
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 10/34 · Low
Exposure 15/34 · Moderate