CVE-2011-1751

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."

🔗 References (36)

• secalert@redhathttp://blog.nelhage.com/2011/08/breaking-out-of-kvm/
• secalert@redhathttp://git.kernel.org/?p=virt/kvm/qemu-kvm.git%3Ba=commit%3Bh=505597e4476a6bc219d0ec1362b760d71cb4fdca
• secalert@redhathttp://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html
• secalert@redhathttp://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html
• secalert@redhathttp://rhn.redhat.com/errata/RHSA-2011-0534.html
• secalert@redhathttp://secunia.com/advisories/44393
• secalert@redhathttp://secunia.com/advisories/44458
• secalert@redhathttp://secunia.com/advisories/44648
• secalert@redhathttp://secunia.com/advisories/44658
• secalert@redhathttp://secunia.com/advisories/44660
• secalert@redhathttp://secunia.com/advisories/44900
• secalert@redhathttp://www.openwall.com/lists/oss-security/2011/05/19/2
• secalert@redhathttp://www.osvdb.org/73395
• secalert@redhathttp://www.securityfocus.com/bid/47927
• secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=699773