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Ls Advisories Gentoo Esm H240
Price Tag 1security advisorygentooGnuPG

Gentoo: GLSA-202303-02 Normal: GnuPG Randomness Generation Vulnerability

Due to a design flaw, the output of GnuPG's Random Number Generator (RNG) is predictable.. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201612-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: GnuPG: RNG output is predictable Date: December 02, 2016 Bugs: #591536 ID: 201612-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= Due to a design flaw, the output of GnuPG's Random Number Generator (RNG) is predictable. Background ========= The GNU Privacy Guard, GnuPG, is a free replacement for the PGP suite of cryptographic software. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-crypt/gnupg < 1.4.21 > = 1.4.21 Description ========== A long standing bug (since 1998) in Libgcrypt (see "GLSA 201610-04" below) and GnuPG allows an attacker to predict the output from the standard RNG. Please review the "Entropy Loss and Output Predictability in the Libgcrypt PRNG" paper below for a deep technical analysis. Impact ===== An attacker who obtains 580 bytes of the random number from the standard RNG can trivially predict the next 20 bytes of output. This flaw does not affect the default generation of keys, because running gpg for key creation creates at most 2 keys from the pool. For a single 4096 bit RSA key, 512 bytes of random are required and thus for the second key (encryption subkey), 20 bytes could be predicted from the the first key. However, the security of an OpenPGP key depends on the primary key (which was generated first) andthus the 20 predictable bytes should not be a problem. For the default key length of 2048 bit nothing will be predictable. Workaround ========= There is no known workaround at this time. Resolution ========= All GnuPG 1 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =app-crypt/gnupg-1.4.21" References ========= [ 1 ] CVE-2016-6313 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6313 [ 2 ] Entropy Loss and Output Predictability in the Libgcrypt PRNG https://formal.kastel.kit.edu/~klebanov/pubs/libgcrypt-cve-2016-6313.pdf [ 3 ] GLSA 201610-04 https://security.gentoo.org/glsa/201610-04 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201612-01 Concerns? ======== Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2016 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5/ . Investigate the GnuPG RNG output reliability concern detailed in Gentoo's security notice. Users are advised to perform an upgrade.. GnuPG Predictable Output,Gentoo Linux Security,RNG Issue Resolution,Software Update Guidance. . LinuxSecurity.com Team

Calendar 2 Dec 02, 2016 Gentoo
87
Ls Advisories Debian Esm H240
Price Tag 1security advisorycriticalDebian

Debian: DSA-3650-1 Critical: Libgcrypt20 RNG Attack Overview

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. . - ------------------------------------------------------------------------- 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 - ------------------------------------------------------------------------- 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/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Identifying a significant vulnerability in libgcrypt20's RNG is essential to mitigate predictability in secure software implementations.. libgcrypt20, random number generator, Debian security. . Severity: Critical. LinuxSecurity.com Team

Calendar 2 Aug 17, 2016 •Critical Debian
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[{"id":483,"title":"Self-taught through trial and error","votes":545,"type":"x","order":1,"pct":78.42,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.32,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.89,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.37,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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