dexconf in XFree86 Xserver 4.1.0-2 creates the /dev/dri directory with insecure permissions (666), which allows local users to replace or create files in the root file system.
http://www.redhat.com/support/errata/RHSA-2003-067.html
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1017429.1-1
http://sunsolve.sun.com/search/document.do?assetkey=1-66-228529-1
http://groups.google.com/groups?selm=20010829121505.A16004%40compusol.com.au