Updated qemu-kvm-rhev packages that fix several security issues are nowavailable for Red Hat Enterprise Virtualization.The Red Hat Security Response Team has rated this update as having Moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.
KVM (Kernel-based Virtual Machine) is a full virtualization solution forLinux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides theuser-space component for running virtual machines using KVM in environmentsmanaged by Red Hat Enterprise Virtualization Manager.Multiple integer overflow, input validation, logic error, and bufferoverflow flaws were discovered in various QEMU block drivers. An attackerable to modify a disk image file loaded by a guest could use these flaws tocrash the guest, or corrupt QEMU process memory on the host, potentiallyresulting in arbitrary code execution on the host with the privileges ofthe QEMU process. (CVE-2014-0143, CVE-2014-0144, CVE-2014-0145,CVE-2014-0147)A buffer overflow flaw was found in the way the virtio_net_handle_mac()function of QEMU processed guest requests to update the table of MACaddresses. A privileged guest user could use this flaw to corrupt QEMUprocess memory on the host, potentially resulting in arbitrary codeexecution on the host with the privileges of the QEMU process.(CVE-2014-0150)A divide-by-zero flaw was found in the seek_to_sector() function of theparallels block driver in QEMU. An attacker able to modify a disk imagefile loaded by a guest could use this flaw to crash the guest.(CVE-2014-0142)A NULL pointer dereference flaw was found in the QCOW2 block driver inQEMU. An attacker able to modify a disk image file loaded by a guest coulduse this flaw to crash the guest. (CVE-2014-0146)It was found that the block driver for Hyper-V VHDX images did notcorrectly calculate BAT (Block Allocation Table) entries due to a missingbounds check. An attacker able to modify a disk image file loaded by aguest could use this flaw to crash the guest. (CVE-2014-0148)The CVE-2014-0143 issues were discovered by Kevin Wolf and Stefan Hajnocziof Red Hat, the CVE-2014-0144 issues were discovered by Fam Zheng, JeffCody, Kevin Wolf, and Stefan Hajnoczi of Red Hat, the CVE-2014-0145 issueswere discovered by Stefan Hajnoczi of Red Hat, the CVE-2014-0150 issue wasdiscovered by Michael S. Tsirkin of Red Hat, the CVE-2014-0142,CVE-2014-0146, and CVE-2014-0147 issues were discovered by Kevin Wolf ofRed Hat, and the CVE-2014-0148 issue was discovered by Jeff Cody ofRed Hat.All users of qemu-kvm-rhev are advised to upgrade to these updatedpackages, which contain backported patches to correct these issues. Afterinstalling this update, shut down all running virtual machines. Once allvirtual machines have shut down, start them again for this update to takeeffect.
Before applying this update, make sure all previously released erratarelevant to your system have been applied.This update is available via the Red Hat Network. Details on how touse the Red Hat Network to apply this update are available athttps://access.redhat.com/site/articles/11258
1078201 – CVE-2014-0142 qemu: crash by possible division by zero1078212 – CVE-2014-0148 Qemu: vhdx: bounds checking for block_size and logical_sector_size1078232 – CVE-2014-0146 Qemu: qcow2: NULL dereference in qcow2_open() error path1078846 – CVE-2014-0150 qemu: virtio-net: buffer overflow in virtio_net_handle_mac() function1078848 – CVE-2014-0147 Qemu: block: possible crash due signed types or logic error1078885 – CVE-2014-0145 Qemu: prevent possible buffer overflows1079140 – CVE-2014-0143 Qemu: block: multiple integer overflow flaws1079240 – CVE-2014-0144 Qemu: block: missing input validation
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