Akfingerd 0.5 and earlier versions allow local users to cause a denial of service (crash) via a .plan with a symlink to /dev/urandom or oth…

Akfingerd 0.5 and earlier versions allow local users to cause a denial of service (crash) via a .plan with a symlink to /dev/urandom or other device, then disconnecting while data is being transferred, which causes a SIGPIPE error that Akfingerd cannot handle.