Debian Security Advisory DSA 3554-1 (xen - security update)

2016-04-21T00:00:00
ID OPENVAS:703554
Type openvas
Reporter Copyright (c) 2016 Greenbone Networks GmbH http://greenbone.net
Modified 2017-07-07T00:00:00

Description

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:

CVE-2016-3158, CVE-2016-3159 (XSA-172)

Jan Beulich from SUSE discovered that Xen does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors. A malicious domain can take advantage of this flaw to obtain address space usage and timing information, about another domain, at a fairly low rate.

CVE-2016-3960 (XSA-173)

Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360 discovered an integer overflow in the x86 shadow pagetable code. A HVM guest using shadow pagetables can cause the host to crash. A PV guest using shadow pagetables (i.e. being migrated) with PV superpages enabled (which is not the default) can crash the host, or corrupt hypervisor memory, potentially leading to privilege escalation.

                                        
                                            # OpenVAS Vulnerability Test
# $Id: deb_3554.nasl 6608 2017-07-07 12:05:05Z cfischer $
# Auto-generated from advisory DSA 3554-1 using nvtgen 1.0
# Script version: 1.0
#
# Author:
# Greenbone Networks
#
# Copyright:
# Copyright (c) 2016 Greenbone Networks GmbH http://greenbone.net
# Text descriptions are largely excerpted from the referenced
# advisory, and are Copyright (c) the respective author(s)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#


if(description)
{
    script_id(703554);
    script_version("$Revision: 6608 $");
    script_cve_id("CVE-2016-3158", "CVE-2016-3159", "CVE-2016-3960");
    script_name("Debian Security Advisory DSA 3554-1 (xen - security update)");
    script_tag(name: "last_modification", value: "$Date: 2017-07-07 14:05:05 +0200 (Fri, 07 Jul 2017) $");
    script_tag(name: "creation_date", value: "2016-04-21 00:00:00 +0200 (Thu, 21 Apr 2016)");
    script_tag(name:"cvss_base", value:"7.2");
    script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/I:C/A:C");
    script_tag(name: "solution_type", value: "VendorFix");
    script_tag(name: "qod_type", value: "package");

    script_xref(name: "URL", value: "http://www.debian.org/security/2016/dsa-3554.html");


    script_category(ACT_GATHER_INFO);

    script_copyright("Copyright (c) 2016 Greenbone Networks GmbH http://greenbone.net");
    script_family("Debian Local Security Checks");
    script_dependencies("gather-package-list.nasl");
    script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages");
    script_tag(name: "affected",  value: "xen on Debian Linux");
    script_tag(name: "insight",   value: "Xen is a hypervisor providing services
that allow multiple computer operating systems to execute on the same computer
hardware concurrently.");
    script_tag(name: "solution",  value: "For the stable distribution (jessie),
these problems have been fixed in version 4.4.1-9+deb8u5.

We recommend that you upgrade your xen packages.");
    script_tag(name: "summary",   value: "Multiple vulnerabilities have been
discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project
identifies the following problems:

CVE-2016-3158,
CVE-2016-3159 (XSA-172)

Jan Beulich from SUSE discovered that Xen does not properly handle
writes to the hardware FSW.ES bit when running on AMD64 processors.
A malicious domain can take advantage of this flaw to obtain address
space usage and timing information, about another domain, at a
fairly low rate.

CVE-2016-3960 (XSA-173)

Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360
discovered an integer overflow in the x86 shadow pagetable code. A
HVM guest using shadow pagetables can cause the host to crash. A PV
guest using shadow pagetables (i.e. being migrated) with PV
superpages enabled (which is not the default) can crash the host, or
corrupt hypervisor memory, potentially leading to privilege
escalation.");
    script_tag(name: "vuldetect", value: "This check tests the installed software
version using the apt package manager.");
    exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-deb.inc");

res = "";
report = "";
if ((res = isdpkgvuln(pkg:"libxen-4.4:amd64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"libxen-4.4:i386", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}

if ((res = isdpkgvuln(pkg:"libxen-dev", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"libxenstore3.0:amd64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"libxenstore3.0:i386", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}

if ((res = isdpkgvuln(pkg:"xen-hypervisor-4.4-amd64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-hypervisor-4.4-arm64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-hypervisor-4.4-armhf", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-system-amd64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-system-arm64", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-system-armhf", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-utils-4.4", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xen-utils-common", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"xenstore-utils", ver:"4.4.1-9+deb8u5", rls_regex:"DEB8.[0-9]+")) != NULL) {
    report += res;
}

if (report != "") {
    security_message(data:report);
} else if (__pkg_match) {
    exit(99); # Not vulnerable.
}