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FreeBSD Arbitrary FFS Filesystem Data Block Access Vulnerability

The default filesystem on FreeBSD systems is the Berkeley Fast File System (FFS). A vulnerability has been reported when allocating file sizes on a FFS system.

The vulnerability is a result of improperly calculating file sizes on a FFS filesystem. The vulnerability may allow users to create files that are larger than what FreeBSD's virtual memory system may handle. This may result in a user having access to arbitrary filesystem blocks.