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CVE-2019-5612

Status Candidate

Overview

In FreeBSD 12.0-STABLE before r351264, 12.0-RELEASE before 12.0-RELEASE-p10, 11.3-STABLE before r351265, 11.3-RELEASE before 11.3-RELEASE-p3, and 11.2-RELEASE before 11.2-RELEASE-p14, the kernel driver for /dev/midistat implements a read handler that is not thread-safe. A multi-threaded program can exploit races in the handler to copy out kernel memory outside the boundaries of midistat's data buffer.

Related Files

FreeBSD Security Advisory - FreeBSD-SA-19:23.midi
Posted Aug 22, 2019
Authored by Peter Holm, Mark Johnston | Site security.freebsd.org

FreeBSD Security Advisory - The kernel driver for /dev/midistat implements a handler for read(2). This handler is not thread-safe, and a multi-threaded program can exploit races in the handler to cause it to copy out kernel memory outside the boundaries of midistat's data buffer. The races allow a program to read kernel memory within a 4GB window centered at midistat's data buffer. The buffer is allocated each time the device is opened, so an attacker is not limited to a static 4GB region of memory. On 32-bit platforms, an attempt to trigger the race may cause a page fault in kernel mode, leading to a panic.

tags | advisory, kernel
systems | freebsd
advisories | CVE-2019-5612
SHA-256 | 7c9c21bed5459872dd4210ae02562ae099d6c61dff5b90156a9765cf1beeb7c5
FreeBSD Security Advisory - FreeBSD-SA-19:23.midi
Posted Aug 21, 2019
Authored by Peter Holm, Mark Johnston | Site security.freebsd.org

FreeBSD Security Advisory - The kernel driver for /dev/midistat implements a handler for read(2). This handler is not thread-safe, and a multi-threaded program can exploit races in the handler to cause it to copy out kernel memory outside the boundaries of midistat's data buffer. The races allow a program to read kernel memory within a 4GB window centered at midistat's data buffer. The buffer is allocated each time the device is opened, so an attacker is not limited to a static 4GB region of memory. On 32-bit platforms, an attempt to trigger the race may cause a page fault in kernel mode, leading to a panic.

tags | advisory, kernel
systems | freebsd
advisories | CVE-2019-5612
SHA-256 | f3a37b5b4a8b054c0d5f798740e9983852e75de9e88318c41e4bfc0a3b6709bc
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