Last stage of delirium research group, the security group the defeated the Argus Hacking Challenge (but has not yet been paid in full), has released the details of their adventure. Originally I heard that they used a XSS vulnerability but they actually used a kernel exploit for sol. If your interested in reading an in-depth technical paper on how they accomplished this, it can be found here:
http://www.lsd-pl.net/kernel_vulnerabilities.html