Arch Linux ASA-202107-27 Medium: mbedtls Information Disclosure

Arch Linux Security Advisory ASA-202107-27
=========================================
Severity: Medium
Date    : 2021-07-14
CVE-ID  : CVE-2021-24119
Package : mbedtls
Type    : information disclosure
Remote  : No
Link    : https://security.archlinux.org/AVG-2153

Summary
======
The package mbedtls before version 2.26.0-1 is vulnerable to
information disclosure.

Resolution
=========
Upgrade to 2.26.0-1.

# pacman -Syu "mbedtls>=2.26.0-1"

The problem has been fixed upstream in version 2.26.0.

Workaround
=========
None.

Description
==========
In Trusted Firmware Mbed TLS before version 2.26.0, a side-channel
vulnerability in base64 PEM file decoding allows system-level
(administrator) attackers to obtain information about secret RSA keys
via a controlled-channel and side-channel attack on software running in
isolated environments that can be single stepped, especially Intel SGX.

Impact
=====
A local attacker could disclose secret RSA keys through a side-channel
attack.

References
=========
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md#vulnerability-information-for-cve-2021-24119
https://github.com/Mbed-TLS/mbedtls/commit/0544d49330b9b12b244a54c9ff145d55c45f1aaf
https://security.archlinux.org/CVE-2021-24119