FreeBSD : xen-tools -- PCI MSI mask bits inadvertently exposed to guests (4db8a0f4-27e9-11e5-a4a5-002590263bf5)

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The Xen Project reports :

The mask bits optionally available in the PCI MSI capability structure
are used by the hypervisor to occasionally suppress interrupt
delivery. Unprivileged guests were, however, nevertheless allowed
direct control of these bits.

Interrupts may be observed by Xen at unexpected times, which may lead
to a host crash and therefore a Denial of Service.

See also :

http://xenbits.xen.org/xsa/advisory-129.html
http://www.nessus.org/u?d685ecbf

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 84700 ()

Bugtraq ID:

CVE ID: CVE-2015-4104

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