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Category:   Application (Security)  >   GnuPG (Gnu Privacy Guard) Vendors:   Gnupg.org
(Red Hat Issues Fix) GnuPG Acoustic Side-Channel Attack Lets Local Users Recover RSA Secret Keys
SecurityTracker Alert ID:  1029563
SecurityTracker URL:  http://securitytracker.com/id/1029563
CVE Reference:   CVE-2013-4576   (Links to External Site)
Date:  Jan 8 2014
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.4.16
Description:   A vulnerability was reported in GnuPG. A local user can obtain RSA secret keys.

A physically local user (or a user with a physically local microphone) can monitor the vibration of electronic components in the voltage regulation circuit of the target system while the GnuPG application decrypts known ciphertext to determine the private RSA key via acoustic cryptanalysis.

A 4096-bit RSA key used on a laptop can be determined within an hour.

The original advisory is available at:

http://www.cs.tau.ac.il/~tromer/papers/acoustic-20131218.pdf

Daniel Genkin, Adi Shamir, and Eran Tromer reported this vulnerability.

Impact:   A local user can obtain RSA secret keys.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-0016.html

Vendor URL:  gnupg.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Dec 18 2013 GnuPG Acoustic Side-Channel Attack Lets Local Users Recover RSA Secret Keys



 Source Message Contents

Subject:  [RHSA-2014:0016-01] Moderate: gnupg security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: gnupg security update
Advisory ID:       RHSA-2014:0016-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-0016.html
Issue date:        2014-01-08
CVE Names:         CVE-2013-4576 
=====================================================================

1. Summary:

An updated gnupg package that fixes one security issue is now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The GNU Privacy Guard (GnuPG or GPG) is a tool for encrypting data and
creating digital signatures, compliant with the proposed OpenPGP Internet
standard and the S/MIME standard.

It was found that GnuPG was vulnerable to side-channel attacks via acoustic
cryptanalysis. An attacker in close range to a target system that is
decrypting ciphertexts could possibly use this flaw to recover the RSA
secret key from that system. (CVE-2013-4576)

Red Hat would like to thank Werner Koch of GnuPG upstream for reporting
this issue. Upstream acknowledges Genkin, Shamir, and Tromer as the
original reporters.

All gnupg users are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1043327 - CVE-2013-4576 gnupg: RSA secret key recovery via acoustic cryptanalysis

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnupg-1.4.5-18.el5_10.1.src.rpm

i386:
gnupg-1.4.5-18.el5_10.1.i386.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.i386.rpm

x86_64:
gnupg-1.4.5-18.el5_10.1.x86_64.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnupg-1.4.5-18.el5_10.1.src.rpm

i386:
gnupg-1.4.5-18.el5_10.1.i386.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.i386.rpm

ia64:
gnupg-1.4.5-18.el5_10.1.ia64.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.ia64.rpm

ppc:
gnupg-1.4.5-18.el5_10.1.ppc.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.ppc.rpm

s390x:
gnupg-1.4.5-18.el5_10.1.s390x.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.s390x.rpm

x86_64:
gnupg-1.4.5-18.el5_10.1.x86_64.rpm
gnupg-debuginfo-1.4.5-18.el5_10.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-4576.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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