Arch Linux: ASA-202007-5 Medium: Mbedtls Private Key Recovery

Arch Linux Security Advisory ASA-202007-5
========================================
Severity: Medium
Date    : 2020-07-31
CVE-ID  : CVE-2020-10932
Package : mbedtls
Type    : private key recovery
Remote  : No
Link    : https://security.archlinux.org/AVG-1141

Summary
======
The package mbedtls before version 2.16.7-1 is vulnerable to private
key recovery.

Resolution
=========
Upgrade to 2.16.7-1.

# pacman -Syu "mbedtls>=2.16.7-1"

The problem has been fixed upstream in version 2.16.7.

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

Description
==========
A side channel attack has been found on the ECDSA implementation of
Mbed TLS before 2.22.0, 2.16.6 and 2.7.15, allowing a local attacker
with access to precise enough timing and memory access information
(typically an untrusted operating system attacking a secure enclave
such as SGX or the TrustZone secure world) to fully recover an ECDSA
private key after observing a number of signature operations.

Impact
=====
A remote attacker is able to recover an ECDSA private key.

References
=========
https://security.archlinux.org/CVE-2020-10932