I was having a play around with autofs. The default installation provides a mount point of /misc/cd which will mount /dev/cdrom. Say, for instance, I have a suid root bash shell burned onto a CD. I can gain root access. That easy. The solution would be to distribute the default /etc/auto.misc to have the cd mount point with the parameters -fstype=iso9660,nosuid,nodev,noexec to be safer.
The nosuid and nodev flags will be added to the defaults for autofs-3.1.4-2 and later. I don't believe adding noexec would make anything safer, and it would certainly annoy anyone trying to install software from a disc with an installer on the CD itself (lots of unhappy Quake III players, not a pretty thought). But I'm not a security expert. If you know of any holes that remain open by not adding noexec, please reopen this bug and I'll take a closer look.