[ASA-202007-5] mbedtls: private key recovery

[Morten Linderud]

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://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04
https://security.archlinux.org/CVE-2020-10932
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