Arch Linux alert ASA-201602-19 (libgcrypt)

From:
    	     
 
Levente Polyak <anthraxx@archlinux.org> 
To:
    	     
 
arch-security@archlinux.org 
Subject:
    	     
 
[arch-security] [ASA-201602-19] libgcrypt: secret key extraction 
Date:
    	     
 
Thu, 25 Feb 2016 00:53:51 +0100
Message-ID:
    	     
 
<56CE428F.6080704@archlinux.org>
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/index.php/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/2016q1/0...
https://www.cs.tau.ac.il/~tromer/ecdh/