Bug#451801: This bug is fixed in Ubuntu

Hello,
I was trying to fix it. First thing I did was dpkg-buildpackage'ing
Ubuntu version of libgksu2-0 on Squeeze, as Ubuntu seem to have 16
additional patches over latest Debian package. And it worked, bug is
fixed -- at least for the sudo backend. Why don't you use their
patches? Most of them, if not all, don't look Ubuntu-specific.

Cheers