SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3067-1)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

xen was updated to version 4.7.1 to fix 17 security issues. These
security issues were fixed :

- CVE-2016-9637: ioport array overflow allowing a
malicious guest administrator can escalate their
privilege to that of the host (bsc#1011652).

- CVE-2016-9386: x86 null segments were not always treated
as unusable allowing an unprivileged guest user program
to elevate its privilege to that of the guest operating
system. Exploit of this vulnerability is easy on Intel
and more complicated on AMD (bsc#1009100).

- CVE-2016-9382: x86 task switch to VM86 mode was
mis-handled, allowing a unprivileged guest process to
escalate its privilege to that of the guest operating
system on AMD hardware. On Intel hardware a malicious
unprivileged guest process can crash the guest
(bsc#1009103).

- CVE-2016-9385: x86 segment base write emulation lacked
canonical address checks, allowing a malicious guest
administrator to crash the host (bsc#1009104).

- CVE-2016-9384: Guest 32-bit ELF symbol table load
leaking host data to unprivileged guest users
(bsc#1009105).

- CVE-2016-9383: The x86 64-bit bit test instruction
emulation was broken, allowing a guest to modify
arbitrary memory leading to arbitray code execution
(bsc#1009107).

- CVE-2016-9377: x86 software interrupt injection was
mis-handled, allowing an unprivileged guest user to
crash the guest (bsc#1009108).

- CVE-2016-9378: x86 software interrupt injection was
mis-handled, allowing an unprivileged guest user to
crash the guest (bsc#1009108)

- CVE-2016-9381: Improper processing of shared rings
allowing guest administrators take over the qemu
process, elevating their privilege to that of the qemu
process (bsc#1009109).

- CVE-2016-9379: Delimiter injection vulnerabilities in
pygrub allowed guest administrators to obtain the
contents of sensitive host files or delete the files
(bsc#1009111).

- CVE-2016-9380: Delimiter injection vulnerabilities in
pygrub allowed guest administrators to obtain the
contents of sensitive host files or delete the files
(bsc#1009111).

- CVE-2016-7777: Xen did not properly honor CR0.TS and
CR0.EM, which allowed local x86 HVM guest OS users to
read or modify FPU, MMX, or XMM register state
information belonging to arbitrary tasks on the guest by
modifying an instruction while the hypervisor is
preparing to emulate it (bsc#1000106).

- CVE-2016-8910: The rtl8139_cplus_transmit function in
hw/net/rtl8139.c allowed local guest OS administrators
to cause a denial of service (infinite loop and CPU
consumption) by leveraging failure to limit the ring
descriptor count (bsc#1007157).

- CVE-2016-8667: The rc4030_write function in
hw/dma/rc4030.c in allowed local guest OS administrators
to cause a denial of service (divide-by-zero error and
QEMU process crash) via a large interval timer reload
value (bsc#1005004).

- CVE-2016-8669: The serial_update_parameters function in
hw/char/serial.c allowed local guest OS administrators
to cause a denial of service (divide-by-zero error and
QEMU process crash) via vectors involving a value of
divider greater than baud base (bsc#1005005).

- CVE-2016-7908: The mcf_fec_do_tx function in
hw/net/mcf_fec.c did not properly limit the buffer
descriptor count when transmitting packets, which
allowed local guest OS administrators to cause a denial
of service (infinite loop and QEMU process crash) via
vectors involving a buffer descriptor with a length of 0
and crafted values in bd.flags (bsc#1003030).

- CVE-2016-7909: The pcnet_rdra_addr function in
hw/net/pcnet.c allowed local guest OS administrators to
cause a denial of service (infinite loop and QEMU
process crash) by setting the (1) receive or (2)
transmit descriptor ring length to 0 (bsc#1003032).
These non-security issues were fixed :

- bsc#1004981: Xen RPM didn't contain debug hypervisor for
EFI systems

- bsc#1007941: Xen tools limited the number of vcpus to
256

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/1000106
https://bugzilla.suse.com/1003030
https://bugzilla.suse.com/1003032
https://bugzilla.suse.com/1004981
https://bugzilla.suse.com/1005004
https://bugzilla.suse.com/1005005
https://bugzilla.suse.com/1007157
https://bugzilla.suse.com/1007941
https://bugzilla.suse.com/1009100
https://bugzilla.suse.com/1009103
https://bugzilla.suse.com/1009104
https://bugzilla.suse.com/1009105
https://bugzilla.suse.com/1009107
https://bugzilla.suse.com/1009108
https://bugzilla.suse.com/1009109
https://bugzilla.suse.com/1009111
https://bugzilla.suse.com/1011652
https://www.suse.com/security/cve/CVE-2016-7777.html
https://www.suse.com/security/cve/CVE-2016-7908.html
https://www.suse.com/security/cve/CVE-2016-7909.html
https://www.suse.com/security/cve/CVE-2016-8667.html
https://www.suse.com/security/cve/CVE-2016-8669.html
https://www.suse.com/security/cve/CVE-2016-8910.html
https://www.suse.com/security/cve/CVE-2016-9377.html
https://www.suse.com/security/cve/CVE-2016-9378.html
https://www.suse.com/security/cve/CVE-2016-9379.html
https://www.suse.com/security/cve/CVE-2016-9380.html
https://www.suse.com/security/cve/CVE-2016-9381.html
https://www.suse.com/security/cve/CVE-2016-9382.html
https://www.suse.com/security/cve/CVE-2016-9383.html
https://www.suse.com/security/cve/CVE-2016-9384.html
https://www.suse.com/security/cve/CVE-2016-9385.html
https://www.suse.com/security/cve/CVE-2016-9386.html
https://www.suse.com/security/cve/CVE-2016-9637.html
http://www.nessus.org/u?a80732c8

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-SP2:zypper in -t
patch SUSE-SLE-SDK-12-SP2-2016-1785=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2016-1785=1

SUSE Linux Enterprise Desktop 12-SP2:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP2-2016-1785=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

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now