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Multiple Vendor BSD /proc File Sytem Vulnerability

Solution:
OpenBSD has the following patch available:

http://www.openbsd.org/errata.html#procfs

FreeBSD has the following patch available:

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:02/procfs.patch

From the NetBSD advisory:
A patch is available for NetBSD 1.4.1, that revokes all vnodes referring to procfs files when a process is about to execute a setuid or setgid binary. It is located at: ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/20000130-procfs
NetBSD-current since 20000126 is not vulnerable. Users of NetBSD-current should upgrade to a source tree later than 20000126