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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Ubuntu Issues Fix) OpenSSL DH Parameter Processing Lets Remote Servers Deny Service on Connected Clients
SecurityTracker Alert ID:  1041189
SecurityTracker URL:  http://securitytracker.com/id/1041189
CVE Reference:   CVE-2018-0732   (Links to External Site)
Date:  Jun 27 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:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://usn.ubuntu.com/usn/usn-3692-1

Vendor URL:  usn.ubuntu.com/usn/usn-3692-2 (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 ESM

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



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