CentOS 7 : qemu-kvm (CESA-2015:0999) (Venom)

2015-05-13T00:00:00
ID CENTOS_RHSA-2015-0999.NASL
Type nessus
Reporter Tenable
Modified 2016-05-05T00:00:00

Description

Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (FDC) handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting this issue.

All qemu-kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2015:0999 and 
# CentOS Errata and Security Advisory 2015:0999 respectively.
#

include("compat.inc");

if (description)
{
  script_id(83419);
  script_version("$Revision: 2.13 $");
  script_cvs_date("$Date: 2016/05/05 04:40:38 $");

  script_cve_id("CVE-2015-3456");
  script_bugtraq_id(74640);
  script_osvdb_id(122072);
  script_xref(name:"RHSA", value:"2015:0999");
  script_xref(name:"IAVA", value:"2015-A-0115");

  script_name(english:"CentOS 7 : qemu-kvm (CESA-2015:0999) (Venom)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated qemu-kvm packages that fix one security issue are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution
for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides
the user-space component for running virtual machines using KVM.

An out-of-bounds memory access flaw was found in the way QEMU's
virtual Floppy Disk Controller (FDC) handled FIFO buffer access while
processing certain FDC commands. A privileged guest user could use
this flaw to crash the guest or, potentially, execute arbitrary code
on the host with the privileges of the host's QEMU process
corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting
this issue.

All qemu-kvm users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. After
installing this update, shut down all running virtual machines. Once
all virtual machines have shut down, start them again for this update
to take effect."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://lists.centos.org/pipermail/centos-announce/2015-May/021137.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected qemu-kvm packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libcacard");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libcacard-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libcacard-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:qemu-img");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:qemu-kvm-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:qemu-kvm-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/05/13");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/05/13");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/CentOS/release")) audit(AUDIT_OS_NOT, "CentOS");
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libcacard-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libcacard-devel-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libcacard-tools-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"qemu-img-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"qemu-kvm-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"qemu-kvm-common-1.5.3-86.el7_1.2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"qemu-kvm-tools-1.5.3-86.el7_1.2")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");