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CVE-2019-5602

Status Candidate

Overview

In FreeBSD 12.0-STABLE before r349628, 12.0-RELEASE before 12.0-RELEASE-p7, 11.3-PRERELEASE before r349629, 11.3-RC3 before 11.3-RC3-p1, and 11.2-RELEASE before 11.2-RELEASE-p11, a bug in the cdrom driver allows users with read access to the cdrom device to arbitrarily overwrite kernel memory when media is present thereby allowing a malicious user in the operator group to gain root privileges.

Related Files

FreeBSD Security Advisory - FreeBSD-SA-19:11.cd_ioctl
Posted Jul 3, 2019
Authored by Alex Fortune | Site security.freebsd.org

FreeBSD Security Advisory - To implement one particular ioctl, the Linux emulation code used a special interface present in the cd(4) driver which allows it to copy subchannel information directly to a kernel address. This interface was erroneously made accessible to userland, allowing users with read access to a cd(4) device to arbitrarily overwrite kernel memory when some media is present in the device. A user in the operator group can make use of this interface to gain root privileges on a system with a cd(4) device when some media is present in the device.

tags | advisory, kernel, root
systems | linux, freebsd
advisories | CVE-2019-5602
MD5 | b564cb6482eb056f4f3410e971bced57
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