Mandriva Linux Security Advisory 2013-121 - A flaw was found in how qemu, in snapshot mode (-snapshot command line argument), handled the creation and opening of the temporary file used to store the difference of the virtualized guest's read-only image and the current state. In snapshot mode, bdrv_open() creates an empty temporary file without checking for any mkstemp() or close() failures; it also ignores the possibility of a buffer overrun given an exceptionally long /tmp. Because qemu re-opens that file after creation, it is possible to race qemu and insert a symbolic link with the same expected name as the temporary file, pointing to an attacker-chosen file. This can be used to either overwrite the destination file with the privileges of the user running qemu , or to point to an attacker-readable file that could expose data from the guest to the attacker. A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. It was discovered that the e1000 emulation code in QEMU does not enforce frame size limits in the same way as the real hardware does. This could trigger buffer overflows in the guest operating system driver for that network card, assuming that the host system does not discard such frames.
0f5d0689948e74e63089abe6af1a0447a0fe343b5e6c2298fef30b4a9d5cf5b8Red Hat Security Advisory 2013-0636-01 - The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. A flaw was found in the way QEMU-KVM emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest.
b9a7ef0ff18dd828c5d57c86d14d909fe246d0a7a1f774fcff12bfc8e24254c1Red Hat Security Advisory 2013-0639-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev packages form the user-space component for running virtual machines using KVM. A flaw was found in the way QEMU-KVM emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest. All users of qemu-kvm-rhev are advised to upgrade to these updated packages, which correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.
bed4ca2ffa58ff464b22fe9153408f7383ab7e71c51b9b0765bcd70a4711c44cRed Hat Security Advisory 2013-0610-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev packages form the user-space component for running virtual machines using KVM. A flaw was found in the way QEMU-KVM emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest. All users of qemu-kvm-rhev are advised to upgrade to these updated packages, which correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.
f9283d87e85e0d4f8a1880b89b72c5d932cd753099d7ea82160e3a865ca280baRed Hat Security Advisory 2013-0609-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running virtual machines using KVM. A flaw was found in the way QEMU-KVM emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest. All users of qemu-kvm should upgrade to these updated packages, which contain backported patches to correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.
1b51b67d705de66bc4ced0edf093badfa1d4adcea70ebbf5ce1ddf20b5d9d3d1Red Hat Security Advisory 2013-0608-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. A flaw was found in the way QEMU-KVM emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest. All users of kvm are advised to upgrade to these updated packages, which contain backported patches to correct this issue. Note that the procedure in the Solution section must be performed before this update will take effect.
f2e010070aad2343f47b3e482e950b8c4228c64cb7b9aaf1697885a65a553a9cRed Hat Security Advisory 2013-0599-01 - The xen packages contain administration tools and the xend service for managing the kernel-xen kernel for virtualization on Red Hat Enterprise Linux. A flaw was found in the way QEMU emulated the e1000 network interface card when the host was configured to accept jumbo network frames, and a fully-virtualized guest using the e1000 emulated driver was not. A remote attacker could use this flaw to crash the guest or, potentially, execute arbitrary code with root privileges in the guest. All users of xen are advised to upgrade to these updated packages, which correct this issue. After installing the updated packages, all running fully-virtualized guests must be restarted for this update to take effect.
31d8e98927550d76b3d7d6cb471fa6adae45d950328f01261814a3f1063aa443Debian Linux Security Advisory 2619-1 - A buffer overflow was found in the e1000e emulation, which could be triggered when processing jumbo frames.
81f2b591663f58be44958c5d035a4fa755f483e4d31f8221c130086accb53fb4Ubuntu Security Notice 1692-1 - It was discovered that QEMU incorrectly handled certain e1000 packet sizes. In certain environments, an attacker may use this flaw in combination with large packets to cause a denial of service or execute arbitrary code in the guest.
8f41cb5967f46e89cb5e11c2d7d0ee866691b393d0205ae5a844327a2cef2d94Debian Linux Security Advisory 2608-1 - It was discovered that the e1000 emulation code in QEMU does not enforce frame size limits in the same way as the real hardware does. This could trigger buffer overflows in the guest operating system driver for that network card, assuming that the host system does not discard such frames (which it will by default).
885c09b10b563f1d09f7b11e89fe4648ad65477609292a1caa73573351a389f0Debian Linux Security Advisory 2607-1 - It was discovered that the e1000 emulation code in QEMU does not enforce frame size limits in the same way as the real hardware does. This could trigger buffer overflows in the guest operating system driver for that network card, assuming that the host system does not discard such frames (which it will by default).
cbc6fe2d8705fb44082076cf2f5b84f138b813ca49da1f70ef16a66238fc582d
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