4.3.1 Release Notes

Release Date: 2009-12-02


Network Security Services for Java (JSS) 4.3.1 is a minor release with the following new features:

  • Support for SSL3 & TLS Renegotiation Vulnerablity
  • Support to explicitly set the key usage for the generated private key

JSS 4.3.1 is tri-licensed under MPL 1.1/GPL 2.0/LGPL 2.1.

New in JSS 4.3.1

 A list of bug fixes and enhancement requests were implemented in this release can be obtained by running this bugzilla query

JSS 4.3.1 requires NSS 3.12.5 or higher.

SSL3 & TLS Renegotiation Vulnerability

    See CVE-2009-3555 and US-CERT VU#120541 for more information about this security vulnerability.

    All SSL/TLS renegotiation is disabled by default in NSS 3.12.5 and therefore will be disabled by default with JSS 4.3.1. This will cause programs that attempt to perform renegotiation to experience failures where they formerly experienced successes, and is necessary for them to not be vulnerable, until such time as a new safe renegotiation scheme is standardized by the IETF.

    If an application depends on renegotiation feature, it can be enabled by setting the environment variable NSS_SSL_ENABLE_RENEGOTIATION to 1. By setting this environmental variable, the fix provided by these patches will have no effect and the application may become vulnerable to the issue.

    This default setting can also be changed within the application by using the following JSS methods:

    The mode of renegotiation that the peer must use can be set to the following:
    • SSLSocket.SSL_RENEGOTIATE_NEVER - Never renegotiate at all. (Default)
    • SSLSocket.SSL_RENEGOTIATE_UNRESTRICTED - Renegotiate without
      restriction, whether or not the peer's client hello bears the
      renegotiation info extension (like we always did in the past).

Explicitly set the key usage for the generated private key

Distribution Information


Documentation for JSS 4.3.1 is available as follows:

Platform Information

  • You can check out the source from CVS by

      cvs co -r JSS_4_3_1_RTM JSS
  • JSS 4.3.1 works with JDK versions 4 or higher we suggest the latest.
  • JSS 4.3.1 requires NSS 3.12.5 or higher.
  • JSS 4.3.1 requires NSPR 4.7.1 or higher.
  • JSS only supports the native threading model (no green threads).

Known Bugs and Issues

  • For a list of reported bugs that have not yet been fixed, click here. Note that some bugs may have been fixed since JSS 4.3.1 was released. 


  • JSS 4.3.1 is backwards compatible with JSS 4.2. Applications compiled against JSS 4.2 will work with JSS 4.3.1.
  • The 4.3.1 version of libjss4.so/jss4.dll must only be used with jss4.jar. In general, a JSS JAR file must be used with the JSS shared library from the exact same release.
  • To obtain the version info from the jar file use, "System.out.println(org.mozilla.jss.CryptoManager.JAR_JSS_VERSION)" and to check the shared library: strings libjss4.so | grep -i header  


  • Bugs discovered should be reported by filing a bug report with bugzilla.
  • You can also give feedback directly to the developers on the Mozilla Cryptography forums...