Last night, I wrote a script to automatically update Java within Kali Linux 32-bit and 64-bit images. A few times I've been on an internal pentest and couldn't access an application because Java was significantly outdated. In some cases I couldn't even ignore this warning.

This usually caused me to go to Google, searching how to update it in Kali. I always ran across the same thread by purehate (https://forums.kali.org/showthread.php?41-Installing-Java-on-Kali-Linux). I figured I'd tweak around with this and see if I could automate it, and I did.

I have a few friends try it out on both 32-bit and 64-bit versions, and it worked flawless for them. For one person, it updated them from 6.27 to 7.51, another person from 7.17 to 7.51, and another person from 7.25 to 7.51 etc.

It simply does this:

1. Check /opt folder for the jdk folder.
2. Strips out the jdk folder to grab its build number.
3. Goes to http://www.oracle.com/technetwork/java/javase/downloads/index.html and checks for any jdk versions (it'll work even when there's version 8 eventually).
4. Follows the jdk links to the actual downloads pages.
5. Checks the version of Kali Linux to see if it's 32-bit or 64-bit.
6. Downloads the appropriate jdk version
7. Extracts this file when it's finished downloading
8. Moves it to /opt, and runs all the update-alternatives commands (also taking into perspective either 32-bit or 64-bit folders).
9. Checks to see if Google Chrome exists. If it does, it creates a symbolic link in /opt/google/chrome/plugins to get Java to work with it.
10. Done

If there's a request to add/remove anything to it to make it more compatible or easier, I'm game for making those changes any day.

Downloadable from my github repository: https://github.com/altjx/ipwn/blob/master/java-update.py