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https://issues.apache.org/jira/browse/KNOX-566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14619240#comment-14619240
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Jeffrey E Rodriguez commented on KNOX-566:
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To answer your question about IBM JDK, I found some info at:
http://www-01.ibm.com/support/docview.wss?uid=swg21959956
DH keys that are less than 768 bits are disabled by default in the
java.security file. For example:
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768
When FIPS mode is enabled in the IBMJSSE2 provider by setting
com.ibm.jsse2.usefipsprovider=true, a 2048-bit DH key size is used on the
server side.
Note: ECDH and ECDHE cipher suites are not affected by the Logjam vulnerability.
This vulnerability is addressed in the following fix pack levels:
IBM SDK, Java Technology Edition, Version 8, Service Refresh 1, Fix Pack 1
IBM SDK, Java Technology Edition, Version 7, Release 1, Service Refresh 3,
Fix Pack 1
IBM SDK, Java Technology Edition, Version 7, Service Refresh 9, Fix Pack 1
IBM SDK, Java Technology Edition, Version 6.0.1 (J9 VM2.6), Service Refresh
8, Fix Pack 5
IBM SDK, Java Technology Edition, Version 6, Service Refresh 16, Fix Pack 5
IBM SDK, Java 2 Technology Edition, Version 5.0, Service Refresh 16, Fix
Pack 11
> Knox Jetty server is vulnerable to Logjam vulnerability
> -------------------------------------------------------
>
> Key: KNOX-566
> URL: https://issues.apache.org/jira/browse/KNOX-566
> Project: Apache Knox
> Issue Type: Bug
> Affects Versions: 0.5.0
> Environment: Red Hat Enterprise Linux Server release 6.4 (Santiago)
> Reporter: Jeffrey E Rodriguez
> Fix For: 0.7.0
>
>
> See description of logjam
> "The Logjam Attack"
> https://weakdh.org/
> To test you should do:
> [root@bdvs1392 logs]# openssl s_client -connect bdvs1392.svl.ibm.com:8443
> -cipher "EDH" | grep "Server Temp Key"
> depth=0 C = US, ST = Test, L = Test, O = Hadoop, OU = Test, CN =
> bdvs1392.svl.ibm.com
> verify error:num=18:self signed certificate
> verify return:1
> depth=0 C = US, ST = Test, L = Test, O = Hadoop, OU = Test, CN =
> bdvs1392.svl.ibm.com
> verify return:1
> Server Temp Key: DH, 768 bits
> The key should >= 1024
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