Bug 962568

Summary: SSL DHE cipher suites broken in OpenJDK 7
Product: Red Hat Enterprise Linux 6 Reporter: Aaron Ogburn <aogburn>
Component: java-1.7.0-openjdkAssignee: Andrew John Hughes <ahughes>
Status: CLOSED CURRENTRELEASE QA Contact: BaseOS QE - Apps <qe-baseos-apps>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.4CC: jvanek, pe
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-07-01 08:22:05 EDT Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
test keystore
test openssl script none

Description Aaron Ogburn 2013-05-13 17:40:17 EDT
Description of problem:

When performing Diffie-Hellman key agreement for SSL/TLS, the TLS
specification (RFC 5246) says that "Leading bytes of Z that contain all zero
bits are stripped before it is used as the pre_master_secret."

However, com.sun.crypto.provider.DHKeyAgreement.java does not strip leading
zero bytes. This causes approximately 1 out 256 SSL/TLS handshakes with
DH/DHE cipher suites to fail (when the leading byte happens, by chance, to
be zero).

Version-Release number of selected component (if applicable):

java openjdk package version

How reproducible:


Steps to Reproduce:
1. Start the provided TestServer class:

java -Djavax.net.debug=all -Djavax.net.ssl.keyStore=./test_keystore.jks
-Djavax.net.ssl.keyStorePassword=password TestServer

2.  Test repeated connections through openssl.  Can use attached script:


You will occassionally see openssl gets a handshake failure.  The ssl logging logs a "SSLHandshakeException: Invalid Padding lengh"

Actual results: 

Roughly one out of 256 connections fail.

Expected results:

Every connection succeeds

Additional info:

It seems this commit from March 2012 inadvertently broke this:


The commit was done to fix this bug:

Comment 3 Aaron Ogburn 2013-05-13 17:43:13 EDT
Created attachment 747450 [details]
test keystore
Comment 4 Aaron Ogburn 2013-05-13 17:43:37 EDT
Created attachment 747451 [details]
test openssl script
Comment 5 Pasi Eronen 2013-05-14 07:01:26 EDT
Reported to Oracle (bugs.sun.com) as bug 9001039; bug report available this this email on OpenJDK list:


A patch and testcase are available in OpenJDK Bugzilla:

Comment 7 Pasi Eronen 2013-05-20 05:31:04 EDT
This is now visible with Oracle bug ID 8014618:

Comment 8 Andrew John Hughes 2013-05-23 06:17:09 EDT
Once this patch is committed upstream, it can be backported to the 7u trees.
Comment 10 Andrew John Hughes 2013-06-11 10:44:36 EDT
Fixed in 2.4.0: http://blog.fuseyism.com/index.php/2013/06/10/icedtea-2-4-0-released/
Comment 11 Andrew John Hughes 2013-06-30 19:01:31 EDT
In 2.3.10: http://blog.fuseyism.com/index.php/2013/06/28/security-icedtea-2-3-10-for-openjdk-7-released/

Need info from jvanek when this is packaged.
Comment 12 jiri vanek 2013-07-01 08:22:05 EDT
6.4 have already recieved 2.3.10. So the issue should be fixed.