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Ubuntu Security Notice USN-3065-1

Ubuntu Security Notice USN-3065-1
Posted Aug 21, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3065-1 - Felix Doerre and Vladimir Klebanov discovered that Libgcrypt incorrectly handled mixing functions in the random number generator. An attacker able to obtain 4640 bits from the RNG can trivially predict the next 160 bits of output.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2016-6313
SHA-256 | c98949d4841a7c0c1b1da172bfff40d4fc7c110ecdd4cc157730bdce69120e13

Ubuntu Security Notice USN-3065-1

Change Mirror Download

===========================================================================
Ubuntu Security Notice USN-3065-1
August 18, 2016

libgcrypt11, libgcrypt20 vulnerability
===========================================================================

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

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Libgcrypt incorrectly generated random numbers.

Software Description:
- libgcrypt20: LGPL Crypto library
- libgcrypt11: LGPL Crypto library

Details:

Felix D=C3=B6rre and Vladimir Klebanov discovered that Libgcrypt incorrectly
handled mixing functions in the random number generator. An attacker able
to obtain 4640 bits from the RNG can trivially predict the next 160 bits of
output.

Update instructions:

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

Ubuntu 16.04 LTS:
libgcrypt20 1.6.5-2ubuntu0.2

Ubuntu 14.04 LTS:
libgcrypt11 1.5.3-2ubuntu4.4

Ubuntu 12.04 LTS:
libgcrypt11 1.5.0-3ubuntu0.6

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

References:
http://www.ubuntu.com/usn/usn-3065-1
CVE-2016-6313

Package Information:
https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.5-2ubuntu0.2
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.3-2ubuntu4.4
https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu0.6



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