Use-after-free in Asterisk Open Source and Certified Asterisk - CVE-2022-42705
Published: December 2, 2022
Vulnerability identifier: #VU69827
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-42705
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error within res_pjsip_pubsub.c, res_pjsip_outbound_registration.c, pjsip_transport_events.c files when performing activity on a subscription via a reliable transport at the same time Asterisk is also performing activty on that subscription. A remote user can trigger a use-after-free error and perform a denial of service (DoS) attack.
Affected software
Asterisk Open Source
Certified Asterisk
Debian Linux
asterisk (Debian package)
Certified Asterisk
Debian Linux
asterisk (Debian package)
How to mitigate CVE-2022-42705
Install updates from vendor's website.
Asterisk Open Source - addressed in versions 16.29.1, 18.15.1, 19.7.1, 20.0.1
Certified Asterisk - update to 18.9-cert3
asterisk (Debian package) - update to 1:16.28.0~dfsg-0+deb11u2
Certified Asterisk - update to 18.9-cert3
asterisk (Debian package) - update to 1:16.28.0~dfsg-0+deb11u2