FreeBSD : xen-kernel -- Uncontrolled creation of large page mappings by PV guests (3d9f6260-881d-11e5-ab94-002590263bf5)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

The Xen Project reports :

The code to validate level 2 page table entries is bypassed when
certain conditions are satisfied. This means that a PV guest can
create writable mappings using super page mappings. Such writable
mappings can violate Xen intended invariants for pages which Xen is
supposed to keep read-only. This is possible even if the
'allowsuperpage' command line option is not used.

Malicious PV guest administrators can escalate privilege so as to
control the whole system.

See also :

http://xenbits.xen.org/xsa/advisory-148.html
http://www.nessus.org/u?8cfdd50d

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 86836 ()

Bugtraq ID:

CVE ID: CVE-2015-7835

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