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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:  1042067
SecurityTracker URL:
CVE Reference:   CVE-2018-0732   (Links to External Site)
Date:  Nov 12 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-2018-3221 Moderate: Oracle Linux 7 openssl security, bug fix, and enhancement update

Oracle Linux Security Advisory ELSA-2018-3221

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



Description of changes:

- sha256 is used for the RSA pairwise consistency test instead of sha1

- fix CVE-2018-0495 - ROHNP - Key Extraction Side Channel on DSA, ECDSA
- fix incorrect error message on FIPS DSA parameter generation (#1603597)

- ppc64le is not multilib architecture (#1585004)

- add S390x assembler updates
- make CA name list comparison function case sensitive (#1548401)
- fix CVE-2017-3735 - possible one byte overread with X.509 IPAdressFamily
- fix CVE-2018-0732 - large prime DH DoS of TLS client
- fix CVE-2018-0737 - RSA key generation cache timing vulnerability
- fix CVE-2018-0739 - stack overflow parsing recursive ASN.1 structure

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