FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

qemu -- code execution on host machine

Affected packages
qemu < 2.4.0
qemu-devel < 2.4.0
qemu-sbruno < 2.4.50.g20150814
qemu-user-static < 2.4.50.g20150814


VuXML ID aea8d90e-b0c1-11e5-8d13-bc5ff45d0f28
Discovery 2015-06-17
Entry 2016-01-01

Petr Matousek of Red Hat Inc. reports:

Due converting PIO to the new memory read/write api we no longer provide separate I/O region lenghts for read and write operations. As a result, reading from PIT Mode/Command register will end with accessing pit->channels with invalid index and potentially cause memory corruption and/or minor information leak.

A privileged guest user in a guest with QEMU PIT emulation enabled could potentially (tough unlikely) use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process.

Please note that by default QEMU/KVM guests use in-kernel (KVM) PIT emulation and are thus not vulnerable to this issue.


CVE Name CVE-2015-3214