Vulnerability CVE-2015-4000 - SSL/TLS Diffie-Hellman Modulus <= 1024 Bits (Logjam)

Products

• CA Spectrum
• CA eHealth

Issue/Introduction

Vulnerability - SSL/TLS Diffie-Hellman Modulus <= 1024 Bits (Logjam)

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4000

 

Environment

Release : 20.2

Component : Spectrum Core / SpectroSERVER

Resolution

The DHE and CBC cicpers can be removed from the server.xml file for Tomcat.

Work with your security team to ensure the proper CIPHERs are removed.

Default CIPHERs in a 20.2 install:

 

ciphers="TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
                    TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
                    TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
                    TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
                    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
                    TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
                    TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
                    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
                    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
                    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
                    TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
                    TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
                    TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                    TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
                    TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
                    TLS_DHE_RSA_WITH_AES_256_CBC_SHA256"