CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:S/C:C/I:N/A:N
EPSS
Percentile
26.5%
A reboot is required to update the iptables rules for the default virtual network to address the CVE-2010-2242 All disk format probing is now disabled in a default installation of libvirt. This change may prevent KVM guests using qcow2 disks from booting successfully. If this occurs verify that the guest XML <disk> element has explicitly requested use of the qcow2 data format via the <driver> element:
<driver name=‘qemu’ type=‘qcow2’/> If the qcow2 is using an external backing file, it may be necessary to re-create the qcow2 file, explicitly specifying the backing store format with the ‘-o’ option.
qemu- img create -f qcow2 -b master.qcow2 -o backing_fmt=qcow2 newdisk.qcow2 If this is not possible, disk format probing can be re-enabled via /etc/libvirt/qemu.conf allow_disk_format_probing = 1 NB, enabling disk format probing has security consequences as per the linked CVEs.
Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory 2010-10960.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(47838);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2010-2237", "CVE-2010-2238", "CVE-2010-2239", "CVE-2010-2242");
script_xref(name:"FEDORA", value:"2010-10960");
script_name(english:"Fedora 13 : libvirt-0.8.2-1.fc13 (2010-10960)");
script_summary(english:"Checks rpm output for the updated package.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Fedora host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"A reboot is required to update the iptables rules for the default
virtual network to address the CVE-2010-2242 All disk format probing
is now disabled in a default installation of libvirt. This change may
prevent KVM guests using qcow2 disks from booting successfully. If
this occurs verify that the guest XML <disk> element has explicitly
requested use of the qcow2 data format via the <driver> element:
<driver name='qemu' type='qcow2'/> If the qcow2 is using an external
backing file, it may be necessary to re-create the qcow2 file,
explicitly specifying the backing store format with the '-o' option.
qemu- img create -f qcow2 -b master.qcow2 -o backing_fmt=qcow2
newdisk.qcow2 If this is not possible, disk format probing can be
re-enabled via /etc/libvirt/qemu.conf allow_disk_format_probing = 1
NB, enabling disk format probing has security consequences as per the
linked CVEs.
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://bugzilla.redhat.com/show_bug.cgi?id=602455"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugzilla.redhat.com/show_bug.cgi?id=607810"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugzilla.redhat.com/show_bug.cgi?id=607811"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugzilla.redhat.com/show_bug.cgi?id=607812"
);
# https://lists.fedoraproject.org/pipermail/package-announce/2010-July/044520.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?51f20b6d"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected libvirt package."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:S/C:C/I:N/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:libvirt");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:13");
script_set_attribute(attribute:"patch_publication_date", value:"2010/07/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2010/07/27");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2010-2021 Tenable Network Security, Inc.");
script_family(english:"Fedora Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^13([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 13.x", "Fedora " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
flag = 0;
if (rpm_check(release:"FC13", reference:"libvirt-0.8.2-1.fc13")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libvirt");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2237
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2238
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2239
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2242
www.nessus.org/u?51f20b6d
bugzilla.redhat.com/show_bug.cgi?id=602455
bugzilla.redhat.com/show_bug.cgi?id=607810
bugzilla.redhat.com/show_bug.cgi?id=607811
bugzilla.redhat.com/show_bug.cgi?id=607812