Comment # 6 on bug 837959 from Wolfgang Bauer

(In reply to Nathan Cutler from comment #5)
> In openSUSE 13.2 the kdesu binary is in the kdebase4-runtime package. Tested
> and the issue still exists there.

Hm, I just tried that (with the reproduction steps from comment#0), and it
works fine here on my 13.2 system.

I had to kill kdesud after changing the password, but that's unrelated. It's
probably still remembering the old password...