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[gentoo-announce] [ GLSA 201811-03 ] OpenSSL: Denial of Service

Posted on 09 November 2018
Gentoo-announce

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From: Thomas Deutschmann <whissi@gentoo.org>
Reply-To: security@gentoo.org
To: gentoo-announce@lists.gentoo.org
Message-ID: <b0d903b4-783e-4717-3b8e-4908d08e4c35@gentoo.org>
Subject: [ GLSA 201811-03 ] OpenSSL: Denial of Service

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Gentoo Linux Security Advisory GLSA 201811-03
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https://security.gentoo.org/
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Severity: Normal
Title: OpenSSL: Denial of Service
Date: November 09, 2018
Bugs: #663654
ID: 201811-03

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Synopsis
========
A vulnerability in OpenSSL might allow remote attackers to cause a
Denial of Service condition.

Background
==========
OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/openssl < 1.0.2o-r6 >= 1.0.2o-r6

Description
===========
It was discovered that OpenSSL allow malicious servers to send very
large primes to a client during DH(E) based TLS handshakes.

Impact
======
A remote attacker, by sending large prime to client during DH(E) TLS
handshake, could possibly cause a Denial of Service condition.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All OpenSSL users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.2o-r6"

References
==========
[ 1 ] CVE-2018-0732
https://nvd.nist.gov/vuln/detail/CVE-2018-0732

Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/201811-03

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
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======
Copyright 2018 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


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