Secure your jailbroken iPhone against worm and hacker attacks

Here's a quick step-by-step tutorial.

1. If you don't have MobileTerminal application installed: for 4.х and 5.x firmwares for 3.x just run Cydia, search for MobileTerminal and install.
2. Run MobileTerminal.
3. Type passwd and press return.
4. Enter the default user password alpine and press return.
5. Enter a new password and press return.
6. Enter a new password again and press return.
7. Congratulations, you changed it for default mobile user. Let's do the same for root user.
8. Login as root user: type su root and press return.
9. Type alpine for password
10. Type passwd and press return.
11. Enter a new password and press return.
12. Enter a new password again and press return.
13. That's it!

The passwords are now changed, and your jailbroken iPhone or iPod Touch is now a bit more secure than it was before and less vulnerable to the worm detected recently.