SUSE-SU-2016:2093-1

This update for xen to version 4.5.3 fixes the several issues.

These security issues were fixed:

• CVE-2016-6258: Potential privilege escalation in PV guests (XSA-182) (bsc#988675).
• CVE-2016-6259: Missing SMAP whitelisting in 32-bit exception / event delivery (XSA-183) (bsc#988676).
• CVE-2016-5337: The megasasctrlget_info function allowed local guest OS administrators to obtain sensitive host memory information via vectors related to reading device control information (bsc#983973).
• CVE-2016-5338: The (1) espregread and (2) espregwrite functions allowed local guest OS administrators to cause a denial of service (QEMU process crash) or execute arbitrary code on the host via vectors related to the information transfer buffer (bsc#983984).
• CVE-2016-5238: The get_cmd function in hw/scsi/esp.c might have allowed local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) via vectors related to reading from the information transfer buffer in non-DMA mode (bsc#982960).
• CVE-2016-4453: The vmsvgafiforun function allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via a VGA command (bsc#982225).
• CVE-2016-4454: The vmsvgafiforead_raw function allowed local guest OS administrators to obtain sensitive host memory information or cause a denial of service (QEMU process crash) by changing FIFO registers and issuing a VGA command, which triggered an out-of-bounds read (bsc#982224).
• CVE-2016-5126: Heap-based buffer overflow in the iscsiaioioctl function allowed local guest OS users to cause a denial of service (QEMU process crash) or possibly execute arbitrary code via a crafted iSCSI asynchronous I/O ioctl call (bsc#982286).
• CVE-2016-5105: Stack information leakage while reading configuration (bsc#982024).
• CVE-2016-5106: Out-of-bounds write while setting controller properties (bsc#982025).
• CVE-2016-5107: Out-of-bounds read in megasaslookupframe() function (bsc#982026).
• CVE-2016-4963: The libxl device-handling allowed local guest OS users with access to the driver domain to cause a denial of service (management tool confusion) by manipulating information in the backend directories in xenstore (bsc#979670).
• CVE-2016-4962: The libxl device-handling allowed local OS guest administrators to cause a denial of service (resource consumption or management facility confusion) or gain host OS privileges by manipulating information in guest controlled areas of xenstore (bsc#979620).
• CVE-2016-4952: Out-of-bounds access issue in pvsciringinit_msg/data routines (bsc#981276).
• CVE-2014-3672: The qemu implementation in libvirt Xen allowed local guest OS users to cause a denial of service (host disk consumption) by writing to stdout or stderr (bsc#981264).
• CVE-2016-4441: The get_cmd function in the 53C9X Fast SCSI Controller (FSC) support did not properly check DMA length, which allowed local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) via unspecified vectors, involving an SCSI command (bsc#980724).
• CVE-2016-4439: The espregwrite function in the 53C9X Fast SCSI Controller (FSC) support did not properly check command buffer length, which allowed local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) or potentially execute arbitrary code on the host via unspecified vectors (bsc#980716).
• CVE-2016-3710: The VGA module improperly performed bounds checking on banked access to video memory, which allowed local guest OS administrators to execute arbitrary code on the host by changing access modes after setting the bank register, aka the 'Dark Portal' issue (bsc#978164).
• CVE-2016-3960: Integer overflow in the x86 shadow pagetable code allowed local guest OS users to cause a denial of service (host crash) or possibly gain privileges by shadowing a superpage mapping (bsc#974038).
• CVE-2016-3159: The fpu_fxrstor function in arch/x86/i387.c did not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allowed local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits (bsc#973188).
• CVE-2016-3158: The xrstor function did not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allowed local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits (bsc#973188).
• CVE-2016-4037: The ehciadvancestate function in hw/usb/hcd-ehci.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) via a circular split isochronous transfer descriptor (siTD) list (bsc#976111).
• CVE-2016-4020: The patch_instruction function did not initialize the imm32 variable, which allowed local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR) (bsc#975907).
• CVE-2016-4001: Buffer overflow in the stellarisenetreceive function, when the Stellaris ethernet controller is configured to accept large packets, allowed remote attackers to cause a denial of service (QEMU crash) via a large packet (bsc#975130).
• CVE-2016-4002: Buffer overflow in the mipsnet_receive function, when the guest NIC is configured to accept large packets, allowed remote attackers to cause a denial of service (memory corruption and QEMU crash) or possibly execute arbitrary code via a packet larger than 1514 bytes (bsc#975138).
• bsc#978295: x86 software guest page walk PS bit handling flaw (XSA-176)
• CVE-2016-5403: virtio: unbounded memory allocation on host via guest leading to DoS (XSA-184) (bsc#990923)
• CVE-2016-6351: scsi: esp: OOB write access in espdodma (bsc#990843)

These non-security issues were fixed:

• bsc#986586: Out of memory (oom) during boot on 'modprobe xenblk' (non xen kernel)
• bsc#900418: Dump cannot be performed on SLES12 XEN
• bsc#953339: Implement SUSE specific unplug protocol for emulated PCI devices in PVonHVM guests to qemu-xen-upstream
• bsc#953362: Implement SUSE specific unplug protocol for emulated PCI devices in PVonHVM guests to qemu-xen-upstream
• bsc#953518: Implement SUSE specific unplug protocol for emulated PCI devices in PVonHVM guests to qemu-xen-upstream
• bsc#984981: Implement SUSE specific unplug protocol for emulated PCI devices in PVonHVM guests to qemu-xen-upstream
• bsc#954872: Script block-dmmd not working as expected - libxl: error: libxl_dm.c (Additional fixes)
• bsc#982695: qemu fails to boot HVM guest from xvda
• bsc#958848: HVM guest crash at /usr/src/packages/BUILD/xen-4.4.2-testing/obj/default/balloon/balloon.c:407
• bsc#949889: Fail to install 32-bit paravirt VM under SLES12SP1Beta3 XEN
• bsc#954872: Script block-dmmd not working as expected - libxl: error: libxl_dm.c (another modification)
• bsc#961600: Poor performance when Xen HVM domU configured with max memory greater than current memory
• bsc#963161: Windows VM getting stuck during load while a VF is assigned to it after upgrading to latest maintenance updates
• bsc#976058: Xen error running simple HVM guest (Post Alpha 2 xen+qemu)
• bsc#973631: AWS EC2 kdump issue
• bsc#957986: Indirect descriptors are not compatible with Amazon block backend
• bsc#964427: Discarding device blocks: failed - Input/output error
• bsc#985503: Fixed vif-route
• bsc#978413: PV guest upgrade from SLES11 SP4 to SLES 12 SP2 alpha3 failed