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Ubuntu Security Notice USN-1923-1

Ubuntu Security Notice USN-1923-1
Posted Aug 1, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1923-1 - 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.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2013-4242
MD5 | 310581af51e80deb907a60467ad5dc7e

Ubuntu Security Notice USN-1923-1

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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
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