FreeBSD Security Advisory - Named paths are globally scoped, meaning a process located in one jail can read and modify the content of POSIX shared memory objects created by a process in another jail or the host system. A malicious user that has access to a jailed system is able to abuse shared memory by injecting malicious content in the shared memory region. This memory region might be executed by applications trusting the shared memory, like Squid. This issue could lead to a Denial of Service or local privilege escalation.
f573e47d312f137d9ed081a3149506ed860e451e5a090be1013a7bc8d5badb5eFreeBSD jail incompletely protects the access to the IPC primitives. The 'allow.sysvipc' setting only affects IPC queues, leaving other IPC objects unprotected, making them reachable system-wide independently of the system configuration. Versions 7.0 through 10.3 are affected. Proof of concept included.
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