CVE-2011-1751 - Keltic Vendors

Description

The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port which leads to a use-after-free related to \active qemu timers.\

Reference

http://secunia.com/advisories/44648 https://github.com/nelhage/virtunoid http://www.osvdb.org/73395 https://bugzilla.redhat.com/show_bug.cgi?id=699773 http://blog.nelhage.com/2011/08/breaking-out-of-kvm/ http://secunia.com/advisories/44393 http://secunia.com/advisories/44458 http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=commit;h=505597e4476a6bc219d0ec1362b760d71cb4fdca https://hermes.opensuse.org/messages/8572547 http://secunia.com/advisories/44660 http://secunia.com/advisories/44900 http://rhn.redhat.com/errata/RHSA-2011-0534.html http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html http://secunia.com/advisories/44658 http://www.openwall.com/lists/oss-security/2011/05/19/2 http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html http://www.securityfocus.com/bid/47927 https://www.ubuntu.com/usn/USN-1145-1/