Both virtio-block and virtio-serial read, VirtQueueElements are read in as buffers, and passed to virtqueue_map_sg(), where num_sg is taken from the wire and can force writes to indicies beyond VIRTQUEUE_MAX_SIZE. 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=36cf2a37132c7f01fa9adb5f95f5312b27742fd4
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 1095764]
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
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