CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS
Percentile
100.0%
From Red Hat Security Advisory 2018:0023 :
An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm package provides the user-space component for running virtual machines that use KVM.
Security Fix(es) :
Note: This is the qemu-kvm side of the CVE-2017-5715 mitigation.
Red Hat would like to thank Google Project Zero for reporting this issue.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2018:0023 and
# Oracle Linux Security Advisory ELSA-2018-0023 respectively.
#
include("compat.inc");
if (description)
{
script_id(105667);
script_version("3.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/15");
script_cve_id("CVE-2017-5715");
script_xref(name:"RHSA", value:"2018:0023");
script_xref(name:"IAVA", value:"2018-A-0020");
script_name(english:"Oracle Linux 7 : qemu-kvm (ELSA-2018-0023) (Spectre)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Oracle Linux host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"From Red Hat Security Advisory 2018:0023 :
An update for qemu-kvm is now available for Red Hat Enterprise Linux
7.
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
Kernel-based Virtual Machine (KVM) is a full virtualization solution
for Linux on a variety of architectures. The qemu-kvm package provides
the user-space component for running virtual machines that use KVM.
Security Fix(es) :
* An industry-wide issue was found in the way many modern
microprocessor designs have implemented speculative execution of
instructions (a commonly used performance optimization). There are
three primary variants of the issue which differ in the way the
speculative execution can be exploited. Variant CVE-2017-5715 triggers
the speculative execution by utilizing branch target injection. It
relies on the presence of a precisely-defined instruction sequence in
the privileged code as well as the fact that memory accesses may cause
allocation into the microprocessor's data cache even for speculatively
executed instructions that never actually commit (retire). As a
result, an unprivileged attacker could use this flaw to cross the
syscall and guest/host boundaries and read privileged memory by
conducting targeted cache side-channel attacks. (CVE-2017-5715)
Note: This is the qemu-kvm side of the CVE-2017-5715 mitigation.
Red Hat would like to thank Google Project Zero for reporting this
issue."
);
script_set_attribute(
attribute:"see_also",
value:"https://oss.oracle.com/pipermail/el-errata/2018-January/007438.html"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected qemu-kvm packages."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-img");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-kvm-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-kvm-tools");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/01/04");
script_set_attribute(attribute:"patch_publication_date", value:"2018/01/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/09");
script_set_attribute(attribute:"in_the_news", value:"true");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Oracle Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "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);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 7", "Oracle Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Oracle Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);
flag = 0;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"qemu-img-1.5.3-141.el7_4.6")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"qemu-kvm-1.5.3-141.el7_4.6")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"qemu-kvm-common-1.5.3-141.el7_4.6")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"qemu-kvm-tools-1.5.3-141.el7_4.6")) flag++;
if (flag)
{
if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
else security_note(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "qemu-img / qemu-kvm / qemu-kvm-common / qemu-kvm-tools");
}
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS
Percentile
100.0%