Directory traversal vulnerability in the kernel in Apple Mac OS X 10.4 through 10.4.10 allows local users to bypass the chroot mechanism via a relative path when changing the current working directory.
Improper Limitation of a Pathname to a Restricted Directory The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.