EulerOS 2.0 SP2 : dracut (EulerOS-SA-2018-1021)

2018-01-19T00:00:00
ID EULEROS_SA-2018-1021.NASL
Type nessus
Reporter Tenable
Modified 2018-01-29T00:00:00

Description

According to the version of the dracut packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  • 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 that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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

include("compat.inc");

if (description)
{
  script_id(106162);
  script_version("$Revision: 3.4 $");
  script_cvs_date("$Date: 2018/01/29 14:52:25 $");

  script_cve_id(
    "CVE-2017-5715"
  );
  script_osvdb_id(
    171897
  );
  script_xref(name:"IAVA", value:"2018-A-0020");

  script_name(english:"EulerOS 2.0 SP2 : dracut (EulerOS-SA-2018-1021)");
  script_summary(english:"Checks the rpm output for the updated package.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the version of the dracut packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerability :

  - 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 that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # http://developer.huawei.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2018-1021
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0d78a9b5");
  script_set_attribute(attribute:"solution", value:
"Update the affected dracut package.");
  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:F/RL:ND/RC:ND");
  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:F/RL:X/RC:X");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut-config-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut-config-rescue");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut-fips");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut-fips-aesni");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:dracut-network");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/19");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2018 Tenable Network Security, Inc.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");

  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/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(2)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2");

if (!get_kb_item("Host/EulerOS/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, "EulerOS", cpu);

flag = 0;

pkgs = ["dracut-033-463.3.h3",
        "dracut-config-generic-033-463.3.h3",
        "dracut-config-rescue-033-463.3.h3",
        "dracut-fips-033-463.3.h3",
        "dracut-fips-aesni-033-463.3.h3",
        "dracut-network-033-463.3.h3"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"2", 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, "dracut");
}