openjdk team mailing list archive

[Nathan Bryant <nrb@xxxxxxxxxxxxx>]

** Description changed:

  Due to [CBCATT], some server administrators (including the webservices
  gateway for a major airline reservations provider) choose to disable CBC
  ciphersuites unless the protocol level is TLSv1.1 or later; [TLS1.1]
  introduced an explicit CBC IV to guard against such attacks. (See
  [TLS1.1] section 1.1) On such servers, disabling all CBC ciphersuites
  may leave only RC4 as a trusted cipher.
  
  JDK7 introduced support for TLSv1.2, but chose not to enable it by
  default, due to a policy of not changing such defaults in minor
  revisions. JDK8 enables TLSv1.2 by default.
  
- On Ubuntu, due to USN-2696-1, starting with the openjdk-7-jre-
- 7u79-2.5.6-0ubuntu1.12.04.1 package, RC4 is disabled by default but the
- protocol default remains TLSv1.0.
+ On Ubuntu, due to USN-2696-1, starting with the openjdk-7-jre-7u79-2.5.6-0ubuntu1.12.04.1 package, RC4 is disabled by default but the protocol default remains TLSv1.0. This can leave no remaining trusted ciphers, and
+ negotiation can fail.
  
  Workaround: on OpenJDK7, it is possible to either use
  SSLContext.getInstance("TLSv1.2") or re-enable RC4 via
  SSLSocket.setEnabledCipherSuites(), but neither workaround is viable if
  one doesn't have access to 3rd-party source code.
  
  References:
  
-    [TLS1.1]   Dierks, T. and E. Rescorla, "The Transport Layer Security
-               (TLS) Protocol Version 1.1", RFC 4346, April 2006.
-               https://www.ietf.org/rfc/rfc4346.txt
+    [TLS1.1]   Dierks, T. and E. Rescorla, "The Transport Layer Security
+               (TLS) Protocol Version 1.1", RFC 4346, April 2006.
+               https://www.ietf.org/rfc/rfc4346.txt
  
-    [CBCATT]   Moeller, B., "Security of CBC Ciphersuites in SSL/TLS:
-               Problems and Countermeasures",
-               http://www.openssl.org/~bodo/tls-cbc.txt.
+    [CBCATT]   Moeller, B., "Security of CBC Ciphersuites in SSL/TLS:
+               Problems and Countermeasures",
+               http://www.openssl.org/~bodo/tls-cbc.txt.

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https://bugs.launchpad.net/bugs/1482924

Title:
  Regressions due to USN-2696-1

Status in openjdk-7 package in Ubuntu:
  New

Bug description:
  Due to [CBCATT], some server administrators (including the webservices
  gateway for a major airline reservations provider) choose to disable
  CBC ciphersuites unless the protocol level is TLSv1.1 or later;
  [TLS1.1] introduced an explicit CBC IV to guard against such attacks.
  (See [TLS1.1] section 1.1) On such servers, disabling all CBC
  ciphersuites may leave only RC4 as a trusted cipher.

  JDK7 introduced support for TLSv1.2, but chose not to enable it by
  default, due to a policy of not changing such defaults in minor
  revisions. JDK8 enables TLSv1.2 by default.

  On Ubuntu, due to USN-2696-1, starting with the openjdk-7-jre-7u79-2.5.6-0ubuntu1.12.04.1 package, RC4 is disabled by default but the protocol default remains TLSv1.0. This can leave no remaining trusted ciphers, and
  negotiation can fail.

  Workaround: on OpenJDK7, it is possible to either use
  SSLContext.getInstance("TLSv1.2") or re-enable RC4 via
  SSLSocket.setEnabledCipherSuites(), but neither workaround is viable
  if one doesn't have access to 3rd-party source code.

  References:

     [TLS1.1]   Dierks, T. and E. Rescorla, "The Transport Layer Security
                (TLS) Protocol Version 1.1", RFC 4346, April 2006.
                https://www.ietf.org/rfc/rfc4346.txt

     [CBCATT]   Moeller, B., "Security of CBC Ciphersuites in SSL/TLS:
                Problems and Countermeasures",
                http://www.openssl.org/~bodo/tls-cbc.txt.

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