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[USN-3065-1] Libgcrypt vulnerability

Posted on 18 August 2016
Ubuntu Security

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

libgcrypt11, libgcrypt20 vulnerability
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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 incorrec=
tly
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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