The ufs_lookup function in the Mac OS X 10.4.8 and FreeBSD 6.1 kernels allows local users to cause a denial of service (kernel panic) and possibly corrupt other filesystems by mounting a crafted UNIX File System (UFS) DMG image that contains a corrupted directory entry (struct direct), related to the ufs_dirbad function. NOTE: a third party states that the FreeBSD issue does not cross privilege boundaries.
http://www.vupen.com/english/advisories/2007/0930
http://www.vupen.com/english/advisories/2007/0171
http://www.us-cert.gov/cas/techalerts/TA07-072A.html
http://www.securitytracker.com/id?1017751
http://www.securityfocus.com/bid/22036
http://secunia.com/advisories/24479
http://secunia.com/advisories/23721
http://projects.info-pull.com/moab/MOAB-12-01-2007.html
http://lists.freebsd.org/pipermail/freebsd-security/2007-January/004218.html
http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html