SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:2093-1) (Bunker Buster)

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote SUSE host is missing one or more security updates.

Description :

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 megasas_ctrl_get_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) esp_reg_read and (2)
esp_reg_write 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 vmsvga_fifo_run 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 vmsvga_fifo_read_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
iscsi_aio_ioctl 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
megasas_lookup_frame() 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
pvsci_ring_init_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 esp_reg_write 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 ehci_advance_state 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
stellaris_enet_receive 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 esp_do_dma
(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/ba
lloon/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

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

See also :

https://bugzilla.suse.com/900418
https://bugzilla.suse.com/949889
https://bugzilla.suse.com/953339
https://bugzilla.suse.com/953362
https://bugzilla.suse.com/953518
https://bugzilla.suse.com/954872
https://bugzilla.suse.com/957986
https://bugzilla.suse.com/958848
https://bugzilla.suse.com/961600
https://bugzilla.suse.com/963161
https://bugzilla.suse.com/964427
https://bugzilla.suse.com/973188
https://bugzilla.suse.com/973631
https://bugzilla.suse.com/974038
https://bugzilla.suse.com/975130
https://bugzilla.suse.com/975138
https://bugzilla.suse.com/975907
https://bugzilla.suse.com/976058
https://bugzilla.suse.com/976111
https://bugzilla.suse.com/978164
https://bugzilla.suse.com/978295
https://bugzilla.suse.com/978413
https://bugzilla.suse.com/979620
https://bugzilla.suse.com/979670
https://bugzilla.suse.com/980716
https://bugzilla.suse.com/980724
https://bugzilla.suse.com/981264
https://bugzilla.suse.com/981276
https://bugzilla.suse.com/982024
https://bugzilla.suse.com/982025
https://bugzilla.suse.com/982026
https://bugzilla.suse.com/982224
https://bugzilla.suse.com/982225
https://bugzilla.suse.com/982286
https://bugzilla.suse.com/982695
https://bugzilla.suse.com/982960
https://bugzilla.suse.com/983973
https://bugzilla.suse.com/983984
https://bugzilla.suse.com/984981
https://bugzilla.suse.com/985503
https://bugzilla.suse.com/986586
https://bugzilla.suse.com/988675
https://bugzilla.suse.com/988676
https://bugzilla.suse.com/990843
https://bugzilla.suse.com/990923
https://www.suse.com/security/cve/CVE-2014-3672.html
https://www.suse.com/security/cve/CVE-2016-3158.html
https://www.suse.com/security/cve/CVE-2016-3159.html
https://www.suse.com/security/cve/CVE-2016-3710.html
https://www.suse.com/security/cve/CVE-2016-3960.html
https://www.suse.com/security/cve/CVE-2016-4001.html
https://www.suse.com/security/cve/CVE-2016-4002.html
https://www.suse.com/security/cve/CVE-2016-4020.html
https://www.suse.com/security/cve/CVE-2016-4037.html
https://www.suse.com/security/cve/CVE-2016-4439.html
https://www.suse.com/security/cve/CVE-2016-4441.html
https://www.suse.com/security/cve/CVE-2016-4453.html
https://www.suse.com/security/cve/CVE-2016-4454.html
https://www.suse.com/security/cve/CVE-2016-4952.html
https://www.suse.com/security/cve/CVE-2016-4962.html
https://www.suse.com/security/cve/CVE-2016-4963.html
https://www.suse.com/security/cve/CVE-2016-5105.html
https://www.suse.com/security/cve/CVE-2016-5106.html
https://www.suse.com/security/cve/CVE-2016-5107.html
https://www.suse.com/security/cve/CVE-2016-5126.html
https://www.suse.com/security/cve/CVE-2016-5238.html
https://www.suse.com/security/cve/CVE-2016-5337.html
https://www.suse.com/security/cve/CVE-2016-5338.html
https://www.suse.com/security/cve/CVE-2016-5403.html
https://www.suse.com/security/cve/CVE-2016-6258.html
https://www.suse.com/security/cve/CVE-2016-6259.html
https://www.suse.com/security/cve/CVE-2016-6351.html
http://www.nessus.org/u?7043ce6f

Solution :

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Software Development Kit 12-SP1:zypper in -t
patch SUSE-SLE-SDK-12-SP1-2016-1238=1

SUSE Linux Enterprise Server 12-SP1:zypper in -t patch
SUSE-SLE-SERVER-12-SP1-2016-1238=1

SUSE Linux Enterprise Desktop 12-SP1:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP1-2016-1238=1

To bring your system up-to-date, use 'zypper patch'.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false