xen was updated to fix 13 security issues.

These security issues were fixed :

  - CVE-2015-7972: Populate-on-demand balloon size     inaccuracy can crash guests (bsc#951845).

  - CVE-2015-7969: Leak of main per-domain vcpu pointer     array (DoS) (bsc#950703).

  - CVE-2015-7969: Leak of per-domain profiling-related vcpu     pointer array (DoS) (bsc#950705).

  - CVE-2015-7971: Some pmu and profiling hypercalls log     without rate limiting (bsc#950706).

  - CVE-2015-4037: Insecure temporary file use in     /net/slirp.c (bsc#932267).

  - CVE-2014-0222: Validate L2 table size to avoid integer     overflows (bsc#877642).

  - CVE-2015-7835: Uncontrolled creation of large page     mappings by PV guests (bsc#950367).

  - CVE-2015-7311: libxl fails to honour readonly flag on     disks with qemu-xen (bsc#947165).

  - CVE-2015-5165: QEMU leak of uninitialized heap memory in     rtl8139 device model (bsc#939712).

  - CVE-2015-5166: Use after free in QEMU/Xen block unplug     protocol (bsc#939709).

  - CVE-2015-5239: Integer overflow in vnc_client_read() and     protocol_client_msg() (bsc#944463).

  - CVE-2015-6815: e1000: infinite loop issue (bsc#944697).

  - CVE-2015-5154: Host code execution via IDE subsystem     CD-ROM (bsc#938344).

This non-security issues was fixed :

  - bsc#941074: VmError: Device 51728 (vbd) could not be     connected. Hotplug scripts not working.

This security update fixes a number of security issues in Xen in wheezy.

For Debian 7 'Wheezy', these problems have been fixed in version 4.1.6.1-1+deb7u1.

We recommend that you upgrade your libidn packages.

CVE-2015-2752

The XEN_DOMCTL_memory_mapping hypercall in Xen 3.2.x through 4.5.x, when using a PCI passthrough device, is not preemptable, which allows local x86 HVM domain users to cause a denial of service (host CPU consumption) via a crafted request to the device model (qemu-dm).

CVE-2015-2756

QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.

CVE-2015-5165

The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to read process heap memory via unspecified vectors.

CVE-2015-5307

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c.

CVE-2015-7969

Multiple memory leaks in Xen 4.0 through 4.6.x allow local guest administrators or domains with certain permission to cause a denial of service (memory consumption) via a large number of 'teardowns' of domains with the vcpu pointer array allocated using the (1) XEN_DOMCTL_max_vcpus hypercall or the xenoprofile state vcpu pointer array allocated using the (2) XENOPROF_get_buffer or (3) XENOPROF_set_passive hypercall.

CVE-2015-7970

The p2m_pod_emergency_sweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service (CPU consumption and possibly reboot) via crafted memory contents that triggers a 'time-consuming linear scan,' related to Populate-on-Demand.

CVE-2015-7971

Xen 3.2.x through 4.6.x does not limit the number of printk console messages when logging certain pmu and profiling hypercalls, which allows local guests to cause a denial of service via a sequence of crafted (1) HYPERCALL_xenoprof_op hypercalls, which are not properly handled in the do_xenoprof_op function in common/xenoprof.c, or (2) HYPERVISOR_xenpmu_op hypercalls, which are not properly handled in the do_xenpmu_op function in arch/x86/cpu/vpmu.c.

CVE-2015-7972

The (1) libxl_set_memory_target function in tools/libxl/libxl.c and (2) libxl__build_post function in tools/libxl/libxl_dom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand (PoD) system, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors related to 'heavy memory pressure.'

CVE-2015-8104

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #DB (aka Debug) exceptions, related to svm.c.

CVE-2015-8339

The memory_exchange function in common/memory.c in Xen 3.2.x through 4.6.x does not properly hand back pages to a domain, which might allow guest OS administrators to cause a denial of service (host crash) via unspecified vectors related to domain teardown.

CVE-2015-8340

The memory_exchange function in common/memory.c in Xen 3.2.x through 4.6.x does not properly release locks, which might allow guest OS administrators to cause a denial of service (deadlock or host crash) via unspecified vectors, related to XENMEM_exchange error handling.

CVE-2015-8550

Xen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service (host OS crash) or gain privileges by writing to memory shared between the frontend and backend, aka a double fetch vulnerability.

CVE-2015-8554

Buffer overflow in hw/pt-msi.c in Xen 4.6.x and earlier, when using the qemu-xen-traditional (aka qemu-dm) device model, allows local x86 HVM guest administrators to gain privileges by leveraging a system with access to a passed-through MSI-X capable physical PCI device and MSI-X table entries, related to a 'write path.'

CVE-2015-8555

Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.

CVE-2015-8615

The hvm_set_callback_via function in arch/x86/hvm/irq.c in Xen 4.6 does not limit the number of printk console messages when logging the new callback method, which allows local HVM guest OS users to cause a denial of service via a large number of changes to the callback method (HVM_PARAM_CALLBACK_IRQ).

CVE-2016-1570

The PV superpage functionality in arch/x86/mm.c in Xen 3.4.0, 3.4.1, and 4.1.x through 4.6.x allows local PV guests to obtain sensitive information, cause a denial of service, gain privileges, or have unspecified other impact via a crafted page identifier (MFN) to the (1) MMUEXT_MARK_SUPER or (2) MMUEXT_UNMARK_SUPER sub-op in the HYPERVISOR_mmuext_op hypercall or (3) unknown vectors related to page table updates.

CVE-2016-1571

The paging_invlpg function in include/asm-x86/paging.h in Xen 3.3.x through 4.6.x, when using shadow mode paging or nested virtualization is enabled, allows local HVM guest users to cause a denial of service (host crash) via a non-canonical guest address in an INVVPID instruction, which triggers a hypervisor bug check.

CVE-2016-2270

Xen 4.6.x and earlier allows local guest administrators to cause a denial of service (host reboot) via vectors related to multiple mappings of MMIO pages with different cachability settings.

CVE-2016-2271

VMX in Xen 4.6.x and earlier, when using an Intel or Cyrix CPU, allows local HVM guest users to cause a denial of service (guest crash) via vectors related to a non-canonical RIP.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
86863	openSUSE Security Update : xen (openSUSE-2015-729)	Nessus	SuSE Local Security Checks	2015/11/13	2021/1/19	medium
91198	Debian DLA-479-1 : xen security update	Nessus	Debian Local Security Checks	2016/5/18	2021/1/11	high

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