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Ubuntu Security Notice USN-3651-1

Ubuntu Security Notice USN-3651-1
Posted May 21, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3651-1 - Ken Johnson and Jann Horn independently discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via sidechannel attacks. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows QEMU to expose new CPU features added by microcode updates to guests on amd64 and i386.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2018-3639
SHA-256 | e1006701fb74f4331e5c75feae579f67e60025aeca0efd430ac543cd7ea720f7

Ubuntu Security Notice USN-3651-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3651-1
May 21, 2018

qemu update
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Side channel execution mitigations were added to QEMU.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

Ken Johnson and Jann Horn independently discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory reads via
sidechannel attacks. An attacker in the guest could use this to expose sensitive
guest information, including kernel memory. This update allows QEMU to expose new
CPU features added by microcode updates to guests on amd64 and i386.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
qemu 1:2.11+dfsg-1ubuntu7.2
qemu-system 1:2.11+dfsg-1ubuntu7.2
qemu-system-x86 1:2.11+dfsg-1ubuntu7.2

Ubuntu 17.10:
qemu 1:2.10+dfsg-0ubuntu3.7
qemu-system 1:2.10+dfsg-0ubuntu3.7
qemu-system-x86 1:2.10+dfsg-0ubuntu3.7

Ubuntu 16.04 LTS:
qemu 1:2.5+dfsg-5ubuntu10.29
qemu-system 1:2.5+dfsg-5ubuntu10.29
qemu-system-x86 1:2.5+dfsg-5ubuntu10.29

Ubuntu 14.04 LTS:
qemu 2.0.0+dfsg-2ubuntu1.42
qemu-system 2.0.0+dfsg-2ubuntu1.42
qemu-system-x86 2.0.0+dfsg-2ubuntu1.42

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3651-1
CVE-2018-3639, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4

Package Information:
https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.2
https://launchpad.net/ubuntu/+source/qemu/1:2.10+dfsg-0ubuntu3.7
https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.29
https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.42
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