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
High
EPSS
Percentile
10.9%
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.
[
{
"vendor": "asterisk",
"product": "asterisk",
"versions": [
{
"version": "< 18.24.3",
"status": "affected"
},
{
"version": ">= 19.0.0, < 20.9.3",
"status": "affected"
},
{
"version": ">= 21.0.0, < 21.4.3",
"status": "affected"
},
{
"version": "< 18.9-cert12",
"status": "affected"
},
{
"version": ">= 19.0, < 20.7-cert2",
"status": "affected"
}
]
}
]
github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9