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Category:   OS (UNIX)  >   IBM AIX Vendors:   IBM
(IBM Issues Fix for IBM AIX) OpenSSL DH Parameter Processing Lets Remote Servers Deny Service on Connected Clients
SecurityTracker Alert ID:  1041690
SecurityTracker URL:  http://securitytracker.com/id/1041690
CVE Reference:   CVE-2018-0732   (Links to External Site)
Date:  Sep 20 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.3, 6.1, 7.1, 7.2
Description:   A vulnerability was reported in OpenSSL. A remote user can cause denial of service conditions on the target system. IBM AIX is affected.

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:   IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory28.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssl_advisory28.asc (Links to External Site)
Cause:   Resource error

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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