Debian: DSA-3650-1: libgcrypt20 security update

Date 17 Aug 2016

Category Debian Linux Distribution - Security Advisories

149

Posted By LinuxSecurity Advisories

Felix Doerre and Vladimir Klebanov from the Karlsruhe Institute of Technology discovered a flaw in the mixing functions of Libgcrypt's random number generator. An attacker who obtains 4640 bits from the RNG can trivially predict the next 160 bits of output.


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Debian Security Advisory DSA-3650-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
August 17, 2016                       https://www.debian.org/security/faq
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Package        : libgcrypt20
CVE ID         : CVE-2016-6313

Felix Doerre and Vladimir Klebanov from the Karlsruhe Institute of
Technology discovered a flaw in the mixing functions of Libgcrypt's
random number generator. An attacker who obtains 4640 bits from the RNG
can trivially predict the next 160 bits of output.

A first analysis on the impact of this bug for GnuPG shows that existing
RSA keys are not weakened. For DSA and Elgamal keys it is also unlikely
that the private key can be predicted from other public information.

For the stable distribution (jessie), this problem has been fixed in
version 1.6.3-2+deb8u2.

We recommend that you upgrade your libgcrypt20 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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