Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : libvirt update (USN-3561-1) (Spectre)

Ubuntu Security Notice (C) 2018 Canonical, Inc. / NASL script (C) 2018 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

It was discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Spectre. An attacker in the
guest could use this to expose sensitive guest information, including
kernel memory.

This update allows libvirt to expose new CPU features added by
microcode updates to guests. On amd64 and i386, new CPU models that
match the updated microcode features were added with an -IBRS suffix.
Certain environments will require guests to be switched manually to
the new CPU models after microcode updates have been applied to the
host.

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

Solution :

Update the affected libvirt-bin and / or libvirt0 packages.

Risk factor :

Medium / CVSS Base Score : 4.7
(CVSS2#AV:L/AC:M/Au:N/C:C/I:N/A:N)
CVSS Temporal Score : 4.5
(CVSS2#E:F/RL:ND/RC:ND)
Public Exploit Available : true

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 106677 ()

Bugtraq ID:

CVE ID: CVE-2017-5715

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