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CVE-2020-12457

Published: 21 August 2020

An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
wolfssl
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

groovy Not vulnerable
(4.5.0+dfsg-2)
hirsute Not vulnerable
(4.5.0+dfsg-2)
impish Not vulnerable
(4.5.0+dfsg-2)
jammy Not vulnerable
(4.5.0+dfsg-2)
kinetic Not vulnerable
(4.5.0+dfsg-2)
lunar Not vulnerable
(4.5.0+dfsg-2)
mantic Not vulnerable
(4.5.0+dfsg-2)
trusty Does not exist

upstream
Released (v4.5.0-stable)
xenial Needed

Patches:
upstream: https://github.com/wolfSSL/wolfssl/commit/df1b7f34f173cfc2968ce12e8fcd2fd8bcc61a59

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H