CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
EPSS
Percentile
29.8%
KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel.
A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. (CVE-2012-3515)
This flaw did not affect the default use of KVM. Affected configurations were :
When guests were started from the command line (‘/usr/libexec/qemu-kvm’), and without specifying a serial or parallel device that specifically does not use a virtual console (vc) back-end. (Note that Red Hat does not support invoking ‘qemu-kvm’ from the command line on Red Hat Enterprise Linux 5.)
Guests that were managed via libvirt, such as when using Virtual Machine Manager (virt-manager), but that have a serial or parallel device that uses a virtual console back-end. By default, guests managed via libvirt will not use a virtual console back-end for such devices.
All KVM users should upgrade to these updated packages, which correct this issue.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(61794);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");
script_cve_id("CVE-2012-3515");
script_name(english:"Scientific Linux Security Update : kvm on SL5.x x86_64 (20120905)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Scientific Linux host is missing one or more security
updates."
);
script_set_attribute(
attribute:"description",
value:
"KVM (Kernel-based Virtual Machine) is a full virtualization solution
for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module
built for the standard Red Hat Enterprise Linux kernel.
A flaw was found in the way QEMU handled VT100 terminal escape
sequences when emulating certain character devices. A guest user with
privileges to write to a character device that is emulated on the host
using a virtual console back-end could use this flaw to crash the
qemu-kvm process on the host or, possibly, escalate their privileges
on the host. (CVE-2012-3515)
This flaw did not affect the default use of KVM. Affected
configurations were :
- When guests were started from the command line
('/usr/libexec/qemu-kvm'), and without specifying a
serial or parallel device that specifically does not use
a virtual console (vc) back-end. (Note that Red Hat does
not support invoking 'qemu-kvm' from the command line on
Red Hat Enterprise Linux 5.)
- Guests that were managed via libvirt, such as when using
Virtual Machine Manager (virt-manager), but that have a
serial or parallel device that uses a virtual console
back-end. By default, guests managed via libvirt will
not use a virtual console back-end for such devices.
All KVM users should upgrade to these updated packages, which correct
this issue."
);
# https://listserv.fnal.gov/scripts/wa.exe?A2=ind1209&L=scientific-linux-errata&T=0&P=609
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?07b8522f"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:kmod-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:kmod-kvm-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:kvm-qemu-img");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:kvm-tools");
script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");
script_set_attribute(attribute:"vuln_publication_date", value:"2012/11/23");
script_set_attribute(attribute:"patch_publication_date", value:"2012/09/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/09/06");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2012-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Scientific Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.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) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^5([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 5.x", "Scientific Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);
flag = 0;
if (rpm_check(release:"SL5", cpu:"x86_64", reference:"kmod-kvm-83-249.el5_8.5")) flag++;
if (rpm_check(release:"SL5", cpu:"x86_64", reference:"kmod-kvm-debug-83-249.el5_8.5")) flag++;
if (rpm_check(release:"SL5", cpu:"x86_64", reference:"kvm-83-249.el5_8.5")) flag++;
if (rpm_check(release:"SL5", cpu:"x86_64", reference:"kvm-qemu-img-83-249.el5_8.5")) flag++;
if (rpm_check(release:"SL5", cpu:"x86_64", reference:"kvm-tools-83-249.el5_8.5")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kmod-kvm / kmod-kvm-debug / kvm / kvm-qemu-img / kvm-tools");
}