config_len is read during state load and later used as size argument when initializing vdev->config as follows: hw/virtio/virtio.c: virtio_load() vdev->config_len = qemu_get_be32(f); qemu_get_buffer(f, vdev->config, vdev->config_len); An user able to alter the savevm data (either on the disk or over the wire during migration) could use this flaw to to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. Upstream fix: ------------- -> http://git.qemu.org/?p=qemu.git;a=commit;h=a890a2f9137ac3cf5b607649e66a6f3a5512d8dc
Statement: This issue does affect the versions of kvm package as shipped with Red Hat Enterprise Linux 5. This issue does affect the versions of qemu-kvm package as shipped with Red Hat Enterprise Linux 7.
Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1095781]
qemu-1.6.2-5.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2014:0674 https://rhn.redhat.com/errata/RHSA-2014-0674.html
Acknowledgements: The issues were discovered as part of the state loading code audit performed by Michael S. Tsirkin of Red Hat, Anthony Liguori and Michael Roth.
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2014:0744 https://rhn.redhat.com/errata/RHSA-2014-0744.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2014:0743 https://rhn.redhat.com/errata/RHSA-2014-0743.html
Please note that this fix causes a regression (see bz 1113009) which has a fix on that bz.
This issue has been addressed in following products: Red Hat Enterprise Linux 7 Via RHSA-2014:0927 https://rhn.redhat.com/errata/RHSA-2014-0927.html
This issue has been addressed in following products: OpenStack 4 for RHEL 6 OpenStack 3 for RHEL 6 Via RHSA-2014:0888 https://rhn.redhat.com/errata/RHSA-2014-0888.html
This issue has been addressed in the following products: OpenStack 5 for RHEL 7 Via RHSA-2014:1268 https://rhn.redhat.com/errata/RHSA-2014-1268.html