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Category:   Application (VPN)  >   OpenSSL Vendors:
(Oracle Issues Fix for Oracle Linux) OpenSSL DH Parameter Processing Lets Remote Servers Deny Service on Connected Clients
SecurityTracker Alert ID:  1041871
SecurityTracker URL:
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:

Vendor URL: (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

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-2018-4249 Important: Oracle Linux 7 openssl security update

Oracle Linux Security Advisory ELSA-2018-4249

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:



Description of changes:

- Oracle bug 28672370: backport CVE-2018-0732
- Oracle bug 28672351: backport CVE-2018-0737

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