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Sicherheit: Mehrere Probleme in QEMU
Aktuelle Meldungen Distributionen
Name: Mehrere Probleme in QEMU
ID: SUSE-SU-2018:0831-1
Distribution: SUSE
Plattformen: SUSE Linux Enterprise Desktop 12-SP2, SUSE Linux Enterprise Server 12-SP2, SUSE Linux Enterprise Server for Raspberry Pi 12-SP2
Datum: Di, 27. März 2018, 22:18
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15124
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17381
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7550
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15119
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18043
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18030
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16845
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5683
Applikationen: QEMU

Originalnachricht

   SUSE Security Update: Security update for qemu
______________________________________________________________________________

Announcement ID: SUSE-SU-2018:0831-1
Rating: important
References: #1040202 #1068032 #1068613 #1070144 #1071228
#1073489 #1076114 #1076179 #1076775 #1076814
#1082276 #1083291 #1085598
Cross-References: CVE-2017-15119 CVE-2017-15124 CVE-2017-16845
CVE-2017-17381 CVE-2017-18030 CVE-2017-18043
CVE-2017-5715 CVE-2018-5683 CVE-2018-7550

Affected Products:
SUSE Linux Enterprise Server for Raspberry Pi 12-SP2
SUSE Linux Enterprise Server 12-SP2
SUSE Linux Enterprise Desktop 12-SP2
______________________________________________________________________________

An update that solves 9 vulnerabilities and has four fixes
is now available.

Description:



This update for qemu fixes the following issues:

This update has the next round of Spectre v2 related patches, which now
integrate with corresponding changes in libvirt. (CVE-2017-5715
bsc#1068032)

The January 2018 release of qemu initially addressed the Spectre v2
vulnerability for KVM guests by exposing the spec-ctrl feature for all x86
vcpu types, which was the quick and dirty approach, but not the proper
solution.

We replaced our initial patch by the patches from upstream.

This update defines spec_ctrl and ibpb cpu feature flags as well as new
cpu models which are clones of existing models with either -IBRS or -IBPB
added to the end of the model name. These new vcpu models explicitly
include the new feature(s), whereas the feature flags can be added to the
cpu parameter as with other features. In short, for continued Spectre v2
protection, ensure that either the appropriate cpu feature flag is added
to the QEMU command-line, or one of the new cpu models is used.

Although migration from older versions is supported, the new cpu features
won't be properly exposed to the guest until it is restarted with the
cpu
features explicitly added. A reboot is insufficient.

A warning patch is added which attempts to detect a migration from a qemu
version which had the quick and dirty fix (it only detects certain cases,
but hopefully is helpful.) For additional information on Spectre v2 as it
relates to QEMU, see:
https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/

A patch is added to continue to detect Spectre v2 mitigation features (as
shown by cpuid), and if found provide that feature to guests, even if
running on older KVM (kernel) versions which do not yet expose that
feature to QEMU. (bsc#1082276)

These two patches will be removed when we can reasonably assume everyone
is running with the appropriate updates.


Also security fixes for the following CVE issues are included:

- CVE-2017-15119: The Network Block Device (NBD) server in Quick Emulator
(QEMU), was vulnerable to a denial of service issue. It could occur if a
client sent large option requests, making the server waste CPU time on
reading up to 4GB per request. A client could use this flaw to keep the
NBD server from serving other requests, resulting in DoS. (bsc#1070144)
- CVE-2017-15124: VNC server implementation in Quick Emulator (QEMU) was
found to be vulnerable to an unbounded memory allocation issue, as it
did not throttle the framebuffer updates sent to its client. If the
client did not consume these updates, VNC server allocates growing
memory to hold onto this data. A malicious remote VNC client could use
this flaw to cause DoS to the server host. (bsc#1073489)
- CVE-2017-16845: The PS2 driver in Qemu did not validate 'rptr' and
'count' values during guest migration, leading to out-of-bounds
access.
(bsc#1068613)
- CVE-2017-17381: The Virtio Vring implementation in QEMU allowed local OS
guest users to cause a denial of service (divide-by-zero error and QEMU
process crash) by unsetting vring alignment while updating Virtio rings.
(bsc#1071228)
- CVE-2017-18030: A problem in the Cirrus driver in Qemu allowed local OS
guest privileged users to cause a denial of service (out-of-bounds array
access and QEMU process crash) via vectors related to negative pitch.
(bsc#1076179)
- CVE-2017-18043: Integer overflow in the macro ROUND_UP (n, d) in Quick
Emulator (Qemu) allowed a user to cause a denial of service (Qemu
process crash). (bsc#1076775)
- CVE-2018-5683: The VGA driver in Qemu allowed local OS guest privileged
users to cause a denial of service (out-of-bounds read and QEMU process
crash) by leveraging improper memory address validation. (bsc#1076114)
- CVE-2018-7550: The multiboot functionality in Quick Emulator (aka QEMU)
allowed local guest OS users to execute arbitrary code on the QEMU host
via an out-of-bounds read or write memory access. (bsc#1083291)

Also the following bugs were fixed:

- Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which we've carried
since
the initial Spectre v2 patch was added. EDX bit 27 of CPUID Leaf 07H,
Sub-leaf 0 provides status on STIBP, and not the PRED_CMD MSR. Exposing
the STIBP CPUID feature bit to the guest is wrong in general, since the
VM doesn't directly control the scheduling of physical hyperthreads.
This is left strictly to the L0 hypervisor.

- Spectre fixes for IBM Z series by providing more hw features to guests
(bsc#1076814)
- Pre-add group kvm for qemu-tools (bsc#1040202)
- the qemu-tools package also needs a prerequire of group management
tools, from the shadow package. (bsc#1085598)


Patch Instructions:

To install this SUSE Security Update use the SUSE recommended installation
methods
like YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

- SUSE Linux Enterprise Server for Raspberry Pi 12-SP2:

zypper in -t patch SUSE-SLE-RPI-12-SP2-2018-555=1

- SUSE Linux Enterprise Server 12-SP2:

zypper in -t patch SUSE-SLE-SERVER-12-SP2-2018-555=1

- SUSE Linux Enterprise Desktop 12-SP2:

zypper in -t patch SUSE-SLE-DESKTOP-12-SP2-2018-555=1



Package List:

- SUSE Linux Enterprise Server for Raspberry Pi 12-SP2 (aarch64):

qemu-2.6.2-41.37.1
qemu-arm-2.6.2-41.37.1
qemu-arm-debuginfo-2.6.2-41.37.1
qemu-block-curl-2.6.2-41.37.1
qemu-block-curl-debuginfo-2.6.2-41.37.1
qemu-block-rbd-2.6.2-41.37.1
qemu-block-rbd-debuginfo-2.6.2-41.37.1
qemu-block-ssh-2.6.2-41.37.1
qemu-block-ssh-debuginfo-2.6.2-41.37.1
qemu-debugsource-2.6.2-41.37.1
qemu-guest-agent-2.6.2-41.37.1
qemu-guest-agent-debuginfo-2.6.2-41.37.1
qemu-lang-2.6.2-41.37.1
qemu-tools-2.6.2-41.37.1
qemu-tools-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server for Raspberry Pi 12-SP2 (noarch):

qemu-ipxe-1.0.0-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (aarch64 ppc64le s390x x86_64):

qemu-2.6.2-41.37.1
qemu-block-curl-2.6.2-41.37.1
qemu-block-curl-debuginfo-2.6.2-41.37.1
qemu-block-ssh-2.6.2-41.37.1
qemu-block-ssh-debuginfo-2.6.2-41.37.1
qemu-debugsource-2.6.2-41.37.1
qemu-guest-agent-2.6.2-41.37.1
qemu-guest-agent-debuginfo-2.6.2-41.37.1
qemu-lang-2.6.2-41.37.1
qemu-tools-2.6.2-41.37.1
qemu-tools-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (aarch64 x86_64):

qemu-block-rbd-2.6.2-41.37.1
qemu-block-rbd-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (s390x x86_64):

qemu-kvm-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (aarch64):

qemu-arm-2.6.2-41.37.1
qemu-arm-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (ppc64le):

qemu-ppc-2.6.2-41.37.1
qemu-ppc-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (noarch):

qemu-ipxe-1.0.0-41.37.1
qemu-seabios-1.9.1-41.37.1
qemu-sgabios-8-41.37.1
qemu-vgabios-1.9.1-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (x86_64):

qemu-x86-2.6.2-41.37.1
qemu-x86-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Server 12-SP2 (s390x):

qemu-s390-2.6.2-41.37.1
qemu-s390-debuginfo-2.6.2-41.37.1

- SUSE Linux Enterprise Desktop 12-SP2 (x86_64):

qemu-2.6.2-41.37.1
qemu-block-curl-2.6.2-41.37.1
qemu-block-curl-debuginfo-2.6.2-41.37.1
qemu-debugsource-2.6.2-41.37.1
qemu-kvm-2.6.2-41.37.1
qemu-tools-2.6.2-41.37.1
qemu-tools-debuginfo-2.6.2-41.37.1
qemu-x86-2.6.2-41.37.1

- SUSE Linux Enterprise Desktop 12-SP2 (noarch):

qemu-ipxe-1.0.0-41.37.1
qemu-seabios-1.9.1-41.37.1
qemu-sgabios-8-41.37.1
qemu-vgabios-1.9.1-41.37.1


References:

https://www.suse.com/security/cve/CVE-2017-15119.html
https://www.suse.com/security/cve/CVE-2017-15124.html
https://www.suse.com/security/cve/CVE-2017-16845.html
https://www.suse.com/security/cve/CVE-2017-17381.html
https://www.suse.com/security/cve/CVE-2017-18030.html
https://www.suse.com/security/cve/CVE-2017-18043.html
https://www.suse.com/security/cve/CVE-2017-5715.html
https://www.suse.com/security/cve/CVE-2018-5683.html
https://www.suse.com/security/cve/CVE-2018-7550.html
https://bugzilla.suse.com/1040202
https://bugzilla.suse.com/1068032
https://bugzilla.suse.com/1068613
https://bugzilla.suse.com/1070144
https://bugzilla.suse.com/1071228
https://bugzilla.suse.com/1073489
https://bugzilla.suse.com/1076114
https://bugzilla.suse.com/1076179
https://bugzilla.suse.com/1076775
https://bugzilla.suse.com/1076814
https://bugzilla.suse.com/1082276
https://bugzilla.suse.com/1083291
https://bugzilla.suse.com/1085598

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