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CVE-2020-16150

Published: 2 September 2020

A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an attacker to recover secret key information. This affects CBC mode because of a computed time difference based on a padding length.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
mbedtls
Launchpad, Ubuntu, Debian
bionic Needs triage

hirsute Ignored
(end of life)
xenial Needs triage

impish Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
focal Needs triage

groovy Ignored
(end of life)
jammy Needs triage

trusty Does not exist

upstream Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N