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CVE-2020-28242

Published: 6 November 2020

An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
asterisk
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

groovy Ignored
(end of life)
trusty Does not exist

xenial Needed

hirsute Not vulnerable
(1:16.15.0~dfsg-1)
impish Not vulnerable
(1:16.15.0~dfsg-1)
jammy Not vulnerable
(1:16.15.0~dfsg-1)
kinetic Not vulnerable
(1:16.15.0~dfsg-1)
lunar Not vulnerable
(1:16.15.0~dfsg-1)
upstream
Released (1:16.15.0~dfsg-1)
mantic Not vulnerable
(1:16.15.0~dfsg-1)
Patches:
upstream: http://downloads.asterisk.org/pub/security/AST-2020-002-13.diff
upstream: http://downloads.asterisk.org/pub/security/AST-2020-002-16.diff

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H