A local or remote unprivileged user may be able to cause the Sun Java System Web Server or the Sun ONE Application Server to exit unexpectedly due to a security vulnerability in Network Security Services (NSS). The ability to disable a Sun Java System Web Server or a Sun ONE Application Server is a type of Denial of Service (DoS).

Additional information about Network Security Services (NSS) is available at:

• http://www.mozilla.org/projects/security/pki/nss/

This issue can occur in the following releases for all platforms:

• Sun Java System Web Server 6.0 without Service Pack 10
• Sun ONE Application Server 7 without Update 3

Note: This issue only affects systems which have SSLv2 enabled. Follow the steps listed in the Relief/Workaround section below to determine if SSLv2 is enabled on the system.  

There are no reliable symptoms that would indicate the described issue has been exploited.

To eliminate the possibility of the described issue from occurring, disable SSLv2 and all associated SSLv2 ciphers as shown below:

For Webserver 6.0:

1. Log into the Administration Server
2. Select the desired server instance from the pull down menu
3. Select the "Preferences" tab and click on the "Edit Listen Sockets" link
4. For the Listen Socket that has SSL enabled, select "Attributes"
5. Under "Ciphers" select "SSL2"
6. Uncheck "SSL version 2" (One may also disable all of the "SSLV2 ciphers" by unselcting them)
7. Click "OK" then "Quit"
8. Click "Apply" in the upper-right corner of the browser
9. Click "Apply Changes" and restart the server
10. Enter the SSL password when prompted

For Appserver 7.0:

1. Log into the Administration Server
2. Select the desired instance from the pull down menu
3. Expand the HTTP Server node
4. Select the "HTTP Listeners" node
5. Select the desired SSL instance to be edited
6. Uncheck the "SSL2 Enabled" checkbox to disable SSLv2
7. Click "Save"
8. Click on "Apply changes required"
9. Restart the server

This issue is addressed in the following releases:

• Sun Java System Web Server 6.0 Service Pack 10 or later
• Sun ONE Application Server 7 Update 3 or later

Sun Java System Web Server 6.0 Service Pack 10 can be found at: http://www.sun.com/download/products.xml?id=43a84f89

Sun ONE Application Server 7 Update can be found at: http://www.sun.com/download/products.xml?id=438cfb75

This solution has no attachment