CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
AI Score
Confidence
Low
Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with .1
or [.1]
, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting noload = res_resolver_unbound.so
in modules.conf, or set rewrite_contact = yes
on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 11 | all | asterisk | <= 1:16.28.0~dfsg-0+deb11u4 | asterisk_1:16.28.0~dfsg-0+deb11u4_all.deb |
Debian | 999 | all | asterisk | < 1:20.9.3~dfsg+~cs6.14.60671435-1 | asterisk_1:20.9.3~dfsg+~cs6.14.60671435-1_all.deb |