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nessusThis script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.ALA_ALAS-2019-1260.NASL
HistoryAug 13, 2019 - 12:00 a.m.

Amazon Linux AMI : qemu-kvm (ALAS-2019-1260) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)

2019-08-1300:00:00
This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
62

Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed processor structure called the ‘processor store buffer’. As a result, an unprivileged attacker could use this flaw to read private data resident within the CPU’s processor store buffer.(CVE-2018-12126)

Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access.(CVE-2019-11091)

Microprocessors use a load port subcomponent to perform load operations from memory or IO. During a load operation, the load port receives data from the memory or IO subsystem and then provides the data to the CPU registers and operations in the CPUs pipelines. Stale load operations results are stored in the ‘load port’ table until overwritten by newer operations. Certain load-port operations triggered by an attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a timing side-channel.(CVE-2018-12127)

A flaw was found in the implementation of the ‘fill buffer’, a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer.(CVE-2018-12130)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2019-1260.
#

include("compat.inc");

if (description)
{
  script_id(127816);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/06");

  script_cve_id("CVE-2018-12126", "CVE-2018-12127", "CVE-2018-12130", "CVE-2019-11091");
  script_xref(name:"ALAS", value:"2019-1260");
  script_xref(name:"CEA-ID", value:"CEA-2019-0547");
  script_xref(name:"CEA-ID", value:"CEA-2019-0324");

  script_name(english:"Amazon Linux AMI : qemu-kvm (ALAS-2019-1260) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Amazon Linux AMI host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Modern Intel microprocessors implement hardware-level
micro-optimizations to improve the performance of writing data back to
CPU caches. The write operation is split into STA (STore Address) and
STD (STore Data) sub-operations. These sub-operations allow the
processor to hand-off address generation logic into these
sub-operations for optimized writes. Both of these sub-operations
write to a shared distributed processor structure called the
'processor store buffer'. As a result, an unprivileged attacker could
use this flaw to read private data resident within the CPU's processor
store buffer.(CVE-2018-12126)

Uncacheable memory on some microprocessors utilizing speculative
execution may allow an authenticated user to potentially enable
information disclosure via a side channel with local
access.(CVE-2019-11091)

Microprocessors use a load port subcomponent to perform load
operations from memory or IO. During a load operation, the load port
receives data from the memory or IO subsystem and then provides the
data to the CPU registers and operations in the CPUs pipelines. Stale
load operations results are stored in the 'load port' table until
overwritten by newer operations. Certain load-port operations
triggered by an attacker can be used to reveal data about previous
stale requests leaking data back to the attacker via a timing
side-channel.(CVE-2018-12127)

A flaw was found in the implementation of the 'fill buffer', a
mechanism used by modern CPUs when a cache-miss is made on L1 CPU
cache. If an attacker can generate a load operation that would create
a page fault, the execution will continue speculatively with incorrect
data from the fill buffer while the data is fetched from higher level
caches. This response time can be measured to infer data in the fill
buffer.(CVE-2018-12130)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2019-1260.html"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Run 'yum update qemu-kvm' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11091");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-img");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/13");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Amazon Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"qemu-img-1.5.3-156.16.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"qemu-kvm-1.5.3-156.16.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"qemu-kvm-common-1.5.3-156.16.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"qemu-kvm-debuginfo-1.5.3-156.16.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"qemu-kvm-tools-1.5.3-156.16.amzn1")) 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, "qemu-img / qemu-kvm / qemu-kvm-common / qemu-kvm-debuginfo / etc");
}
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