Subject: [ASA-201812-7] lib32-openssl-1.0: private key recovery

Arch Linux Security Advisory ASA-201812-7
=========================================

Severity: Low
Date    : 2018-12-08
CVE-ID  : CVE-2018-0734 CVE-2018-5407
Package : lib32-openssl-1.0
Type    : private key recovery
Remote  : Yes
Link    : https://security.archlinux.org/AVG-806

Summary
=======

The package lib32-openssl-1.0 before version 1.0.2.q-1 is vulnerable to
private key recovery.

Resolution
==========

Upgrade to 1.0.2.q-1.

# pacman -Syu "lib32-openssl-1.0>=1.0.2.q-1"

The problems have been fixed upstream in version 1.0.2.q.

Workaround
==========

None.

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

- CVE-2018-0734 (private key recovery)

A timing vulnerability has been found in DSA signature generation in
openssl versions up to and including 1.1.1, where information is leaked
via a side channel when a BN is resized and could lead to private key
recovery.

- CVE-2018-5407 (private key recovery)

A vulnerability has been found in the ECC scalar multiplication
implementation of OpenSSL < 1.1.0i and <= 1.0.2p. The implementation,
used in e.g. ECDSA and ECDH, has been shown
to be vulnerable to a microarchitecture timing side channel attack. An
attacker with sufficient access to mount local timing attacks during
ECDSA signature generation could recover the private key.

Impact
======

A remote attacker might be able to recover a private DSA key via a
timing attack. In addition, a local attacker might be able to recover a
private ECC key via a timing attack.

References
==========

https://www.openssl.org/news/secadv/20181030.txt
https://github.com/openssl/openssl/commit/8abfe72e8c1de1b95f50aa0d9134803b4d00070f
https://github.com/openssl/openssl/pull/7486
https://www.openssl.org/news/secadv/20181112.txt
https://github.com/openssl/openssl/commit/b18162a7c9bbfb57112459a4d6631fa258fd8c0c
https://security.archlinux.org/CVE-2018-0734
https://security.archlinux.org/CVE-2018-5407