Arch Linux: 2016-02-19 Critical Vulnerability in Libgcrypt Secret Keys

The package libgcrypt before version 1.6.5-1 is vulnerable to a side-channel attack leading to extraction of secret decryption keys.

Arch Linux Security Advisory ASA-201602-19
=========================================
Severity: High
Date    : 2016-02-24
CVE-ID  : CVE-2015-7511
Package : libgcrypt
Type    : secret key extraction
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package libgcrypt before version 1.6.5-1 is vulnerable to a
side-channel attack leading to extraction of secret decryption keys.

Resolution
=========
Upgrade to 1.6.5-1.

# pacman -Syu "libgcrypt>=1.6.5-1"

The problem has been fixed upstream in version 1.6.5.

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

Description
==========
A vulnerability was found in a way the ECDH encryption algorithm
decrypts data. An attacker with a specialized setup can extract the
secret decryption key from a target located in an adjacent room within
seconds. This is done by measuring the target's electromagnetic emanations.

Impact
=====
A remote attacker located in an adjacent room is able to extract the
secret decryption key by measuring the target's electromagnetic emanations.

References
=========
https://access.redhat.com/security/cve/CVE-2015-7511
https://lists.gnupg.org/pipermail/gnupg-announce/2016q1/000384.html