NewStart CGSL MAIN 4.05 : qemu-kvm Multiple Vulnerabilities (NS-SA-2019-0154)

2019-08-12T00:00:00
ID NEWSTART_CGSL_NS-SA-2019-0154_QEMU-KVM.NASL
Type nessus
Reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-02-02T00:00:00

Description

The remote NewStart CGSL host, running version MAIN 4.05, has qemu-kvm packages installed that are affected by multiple vulnerabilities:

  • 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

                                        
                                            #
# (C) Tenable Network Security, Inc.
#

# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2019-0154. The text
# itself is copyright (C) ZTE, Inc.

include("compat.inc");

if (description)
{
  script_id(127430);
  script_version("1.2");
  script_cvs_date("Date: 2019/10/18 23:14:15");

  script_cve_id(
    "CVE-2018-12126",
    "CVE-2018-12127",
    "CVE-2018-12130",
    "CVE-2019-11091"
  );

  script_name(english:"NewStart CGSL MAIN 4.05 : qemu-kvm Multiple Vulnerabilities (NS-SA-2019-0154)");

  script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version MAIN 4.05, has qemu-kvm packages installed that are affected by multiple
vulnerabilities:

  - 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)

  - 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)

  - 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)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/notice/NS-SA-2019-0154");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL qemu-kvm packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  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:"vuln_publication_date", value:"2019/05/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  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/ZTE-CGSL/release");
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, "NewStart Carrier Grade Server Linux");

if (release !~ "CGSL MAIN 4.05")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 4.05');

if (!get_kb_item("Host/ZTE-CGSL/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, "NewStart Carrier Grade Server Linux", cpu);

flag = 0;

pkgs = {
  "CGSL MAIN 4.05": [
    "qemu-guest-agent-0.12.1.2-2.506.el6_10.3",
    "qemu-img-0.12.1.2-2.506.el6_10.3",
    "qemu-kvm-0.12.1.2-2.506.el6_10.3",
    "qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3",
    "qemu-kvm-tools-0.12.1.2-2.506.el6_10.3"
  ]
};
pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:"ZTE " + release, reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "qemu-kvm");
}