SUSE SLES11 Security Update : xen (SUSE-SU-2016:2528-1) (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 fixes several issues. These security issues were
fixed :

- CVE-2016-7094: Buffer overflow in Xen allowed local x86
HVM guest OS administrators on guests running with
shadow paging to cause a denial of service via a
pagetable update (bsc#995792)

- CVE-2016-7092: The get_page_from_l3e function in
arch/x86/mm.c in Xen allowed local 32-bit PV guest OS
administrators to gain host OS privileges via vectors
related to L3 recursive pagetables (bsc#995785)

- CVE-2016-6258: The PV pagetable code in arch/x86/mm.c in
Xen allowed local 32-bit PV guest OS administrators to
gain host OS privileges by leveraging fast-paths for
updating pagetable entries (bsc#988675)

- 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-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-2016-4480: The guest_walk_tables function in
arch/x86/mm/guest_walk.c in Xen did not properly handle
the Page Size (PS) page table entry bit at the L4 and L3
page table levels, which might have allowed local guest
OS users to gain privileges via a crafted mapping of
memory (bsc#978295)

- 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-2016-3158: 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-2016-4001: 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)

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/973188
https://bugzilla.suse.com/974038
https://bugzilla.suse.com/975130
https://bugzilla.suse.com/975138
https://bugzilla.suse.com/978164
https://bugzilla.suse.com/978295
https://bugzilla.suse.com/980716
https://bugzilla.suse.com/980724
https://bugzilla.suse.com/981264
https://bugzilla.suse.com/982960
https://bugzilla.suse.com/983984
https://bugzilla.suse.com/988675
https://bugzilla.suse.com/995785
https://bugzilla.suse.com/995792
https://www.suse.com/security/cve/CVE-2014-3615.html
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-2016-4439.html
https://www.suse.com/security/cve/CVE-2016-4441.html
https://www.suse.com/security/cve/CVE-2016-4480.html
https://www.suse.com/security/cve/CVE-2016-5238.html
https://www.suse.com/security/cve/CVE-2016-5338.html
https://www.suse.com/security/cve/CVE-2016-6258.html
https://www.suse.com/security/cve/CVE-2016-7092.html
https://www.suse.com/security/cve/CVE-2016-7094.html
http://www.nessus.org/u?0357eead

Solution :

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

SUSE Linux Enterprise Server 11-SP2-LTSS:zypper in -t patch
slessp2-xen-12786=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

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