CVE-1999-1394: BSD 4.4 based operating systems, when running at security level 1, allow the root user to clear the immutable and append

Summary

BSD 4.4 based operating systems, when running at security level 1, allow the root user to clear the immutable and append-only flags for files by unmounting the file system and using a file system editor such as fsdb to directly modify the file through a device.