[ASA-202101-7] mbedtls: private key recovery

[Morten Linderud]

Arch Linux Security Advisory ASA-202101-7
=========================================

Severity: High
Date    : 2021-01-08
CVE-ID  : CVE-2020-16150
Package : mbedtls
Type    : private key recovery
Remote  : No
Link    : https://security.archlinux.org/AVG-1386

Summary
=======

The package mbedtls before version 2.25.0-1 is vulnerable to private
key recovery.

Resolution
==========

Upgrade to 2.25.0-1.

# pacman -Syu "mbedtls>=2.25.0-1"

The problem has been fixed upstream in version 2.25.0.

Workaround
==========

None.

Description
===========

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. The
issue is fixed in Mbed TLS 2.24.0, 2.16.8 and 2.7.17.

Impact
======

An attacker might be able to recover secret key information via a side-
channel.

References
==========

https://bugs.archlinux.org/task/69128
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1
https://security.archlinux.org/CVE-2020-16150
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