Home / mailings

PDF

[USN-1923-1] GnuPG, Libgcrypt vulnerability

Posted on 01 August 2013
Ubuntu Security

--===============1942188787606933335==
Content-Type: multipart/signed; micalg=pgp-sha1;
protocol="application/pgp-signature"; boundary="IJpNTDwzlM2Ie8A6"
Content-Disposition: inline


--IJpNTDwzlM2Ie8A6
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

==========================================================================
Ubuntu Security Notice USN-1923-1
August 01, 2013

gnupg, libgcrypt11 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

GnuPG and Libgcrypt could be made to expose sensitive information.

Software Description:
- gnupg: GNU privacy guard - a free PGP replacement
- libgcrypt11: LGPL Crypto library - runtime library

Details:

Yuval Yarom and Katrina Falkner discovered a timing-based information leak,
known as Flush+Reload, that could be used to trace execution in programs.
GnuPG and Libgcrypt followed different execution paths based on key-related
data, which could be used to expose the contents of private keys.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.04:
gnupg 1.4.12-7ubuntu1.1
libgcrypt11 1.5.0-3ubuntu2.2

Ubuntu 12.10:
gnupg 1.4.11-3ubuntu4.2
libgcrypt11 1.5.0-3ubuntu1.1

Ubuntu 12.04 LTS:
gnupg 1.4.11-3ubuntu2.3
libgcrypt11 1.5.0-3ubuntu0.2

Ubuntu 10.04 LTS:
gnupg 1.4.10-2ubuntu1.3
libgcrypt11 1.4.4-5ubuntu2.2

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1923-1
CVE-2013-4242

Package Information:
https://launchpad.net/ubuntu/+source/gnupg/1.4.12-7ubuntu1.1
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu2.2
https://launchpad.net/ubuntu/+source/gnupg/1.4.11-3ubuntu4.2
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu1.1
https://launchpad.net/ubuntu/+source/gnupg/1.4.11-3ubuntu2.3
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu0.2
https://launchpad.net/ubuntu/+source/gnupg/1.4.10-2ubuntu1.3
https://launchpad.net/ubuntu/+source/libgcrypt11/1.4.4-5ubuntu2.2

 

TOP