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procfs is the filesystem interface to the process table in the FreeBSD Operating System. A problem exists which could allow a user restrained by a jail to break free. The problem occurs in the ability of jailed members of the system to load the process filesystem. A user restricted by the jail can break free by mounting the process filesystem, and using weaknesses within the filesystem to execute arbitrary commands. This problem makes it possible for a local user with superuser access in the jailed environment to execute commands outside of the jail, and possibly gain unrestricted access to the system.

procfs is the filesystem interface to the process table in the FreeBSD Operating System. A problem exists which could allow a user restrained by a jail to break free. The problem occurs in the ability of jailed members of the system to load the process filesystem. A user restricted by the jail can break free by mounting the process filesystem, and using weaknesses within the filesystem to execute arbitrary commands. This problem makes it possible for a local user with superuser access in the jailed environment to execute commands outside of the jail, and possibly gain unrestricted access to the system.