Title: FreeBSD Arbitrary FFS Filesystem Data Block Access Vulnerability
Severity: MODERATE
Description:
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.
The vulnerability only occurs on FFS filesystems with a block size of greater than 16k, on the i386 architecture, or greater than 32k, on the alpha architecture. The filesystem must also have at least six blocks of free space and an attacker must have write access to at least one file on the filesystem.
Affected Products:
- FreeBSD FreeBSD 4.0.0
- FreeBSD FreeBSD 4.1.0
- FreeBSD FreeBSD 4.1.1
- FreeBSD FreeBSD 4.1.1 -RELEASE
- FreeBSD FreeBSD 4.1.1 -STABLE
- FreeBSD FreeBSD 4.2.0
- FreeBSD FreeBSD 4.2.0 -RELEASE
- FreeBSD FreeBSD 4.2.0 -STABLE
- FreeBSD FreeBSD 4.3.0
- FreeBSD FreeBSD 4.3.0 -RELEASE
- FreeBSD FreeBSD 4.3.0 -RELENG
- FreeBSD FreeBSD 4.3.0 -STABLE
- FreeBSD FreeBSD 4.4.0
- FreeBSD FreeBSD 4.4.0 -RELENG
- FreeBSD FreeBSD 4.4.0 -STABLE
- FreeBSD FreeBSD 4.5.0
- FreeBSD FreeBSD 4.5.0 -RELEASE
- FreeBSD FreeBSD 4.5.0 -STABLE
- FreeBSD FreeBSD 4.6.0
- FreeBSD FreeBSD 4.6.0 -RELEASE
- FreeBSD FreeBSD 4.6.0 -STABLE
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