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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Oracle Issues Fix for Oracle Linux) OpenSSL DH Parameter Processing Lets Remote Servers Deny Service on Connected Clients
SecurityTracker Alert ID:  1041869
SecurityTracker URL:  http://securitytracker.com/id/1041869
CVE Reference:   CVE-2018-0732   (Links to External Site)
Date:  Oct 15 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenSSL. A remote user can cause denial of service conditions on the target system.

A remote server can return a large DH parameter prime value to the connected client during key agreement in a TLS handshake using a DH(E) based cipher suite to cause the client to hang while spending a long period of time generating a key for this prime.

The vendor was notified on June 5, 2018.

Guido Vranken reported this vulnerability.

Impact:   A remote server can cause denial of service conditions on the connected client.
Solution:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2018-4248.html

Vendor URL:  linux.oracle.com/errata/ELSA-2018-4248.html (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Jun 12 2018 OpenSSL DH Parameter Processing Lets Remote Servers Deny Service on Connected Clients



 Source Message Contents

Subject:  [El-errata] ELSA-2018-4248 Important: Oracle Linux 6 openssl security update

Oracle Linux Security Advisory ELSA-2018-4248

http://linux.oracle.com/errata/ELSA-2018-4248.html

The following updated rpms for Oracle Linux 6 have been uploaded to the 
Unbreakable Linux Network:

i386:
openssl-1.0.1e-57.0.6.el6.i686.rpm
openssl-devel-1.0.1e-57.0.6.el6.i686.rpm
openssl-perl-1.0.1e-57.0.6.el6.i686.rpm
openssl-static-1.0.1e-57.0.6.el6.i686.rpm

x86_64:
openssl-1.0.1e-57.0.6.el6.i686.rpm
openssl-1.0.1e-57.0.6.el6.x86_64.rpm
openssl-devel-1.0.1e-57.0.6.el6.i686.rpm
openssl-devel-1.0.1e-57.0.6.el6.x86_64.rpm
openssl-perl-1.0.1e-57.0.6.el6.x86_64.rpm
openssl-static-1.0.1e-57.0.6.el6.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol6/SRPMS-updates/openssl-1.0.1e-57.0.6.el6.src.rpm



Description of changes:

[1.0.1e-57.0.6]
- Oracle bug 28730228: backport CVE-2018-0732
- Oracle bug 28758493: backport CVE-2018-0737


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