gentoo liveCD on a Netra computer with another OS

[ravalox]

Some coworkers of mine have an old netra SPARC system apparently with the original OS installed. They have lost the root password and need to recover it. Can a gentoo live CD change the root password on a foreign OS? Or find one on a current installation? I believe the target OS may be Solaris(I haven't seen this thing, we only go by vague descriptions)