I think, after Carth mentions his dead wife and such, that you have to take Carth with you off the ship at your next (or whenever) stop, and some guy talks about Dustil being alive. After that, Dustil will be on Korriban.
Yah, I'm pretty sure you can use Security on the door, or have a party member with a high enough Security do it for you. Or, you can tell Uthar that Yuthura wants him dead, and he'll give you some poison to slip her. Then, if you tell her about your double-cross, she'll tell you to double-double-cross him, and gives you the key to his room (and tells you to put the poison on his bed).
Datapad inside, plus a neat heavy armor sith mask.