Improper access control in Asterisk Open Source and Certified Asterisk - CVE-2019-18790
Published: November 22, 2019
Vulnerability identifier: #VU22934
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-18790
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. A remote attacker can send a specially crafted SIP request, change a SIP peer’s IP address and hijack the calls.
Note: This vulnerability is only exploitable when the “nat” option is set to the default, or “auto_force_rport”.
Affected software
Asterisk Open Source
Certified Asterisk
asterisk (Alpine package)
Certified Asterisk
asterisk (Alpine package)
How to mitigate CVE-2019-18790
Install updates from vendor's website.
Asterisk Open Source - addressed in versions 13.29.2, 16.6.2, 17.0.1
Certified Asterisk - update to 13.21-cert5
asterisk (Alpine package) - addressed in versions 16.3.0-r3, 16.6.2-r0
Certified Asterisk - update to 13.21-cert5
asterisk (Alpine package) - addressed in versions 16.3.0-r3, 16.6.2-r0