Scientific Linux Security Update : kernel on SL7.x x86_64 (Meltdown) (Spectre)

2018-01-25T00:00:00
ID SL_20180125_KERNEL_ON_SL7_X.NASL
Type nessus
Reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2019-11-02T00:00:00

Description

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.

Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty.

  • 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

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

include("compat.inc");

if (description)
{
  script_id(106340);
  script_version("1.6");
  script_cvs_date("Date: 2019/04/05 23:25:07");

  script_cve_id("CVE-2015-8539", "CVE-2017-12192", "CVE-2017-12193", "CVE-2017-15649", "CVE-2017-5715", "CVE-2017-5753", "CVE-2017-5754", "CVE-2017-7472");
  script_xref(name:"IAVA", value:"2018-A-0019");
  script_xref(name:"IAVA", value:"2018-A-0020");

  script_name(english:"Scientific Linux Security Update : kernel on SL7.x x86_64 (Meltdown) (Spectre)");
  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:
"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.

Note: This issue is present in hardware and cannot be fully fixed via
software update. The updated kernel packages provide software
mitigation for this hardware issue at a cost of potential performance
penalty.

* 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. This fix specifically addresses
S390 processors. (CVE-2017-5715, Important)

* Variant CVE-2017-5753 triggers the speculative execution by
performing a bounds-check bypass. 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
boundary and read privileged memory by conducting targeted cache
side-channel attacks. This fix specifically addresses S390 and PowerPC
processors. (CVE-2017-5753, Important)

* Variant CVE-2017-5754 relies on the fact that, on impacted
microprocessors, during speculative execution of instruction
permission faults, exception generation triggered by a faulting access
is suppressed until the retirement of the whole instruction block. In
a combination with the fact that memory accesses may populate the
cache even when the block is being dropped and never committed
(executed), an unprivileged local attacker could use this flaw to read
privileged (kernel space) memory by conducting targeted cache
side-channel attacks. Note: CVE-2017-5754 affects Intel x86-64
microprocessors. AMD x86-64 microprocessors are not affected by this
issue. This fix specifically addresses PowerPC processors.
(CVE-2017-5754, Important)"
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1801&L=scientific-linux-errata&F=&S=&P=8366
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?801d44c2"
  );
  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_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  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:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/25");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/25");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 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("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");
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);


flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", reference:"kernel-abi-whitelists-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-debug-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-debug-debuginfo-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-debug-devel-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-debuginfo-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-devel-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", reference:"kernel-doc-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-headers-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-tools-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-tools-debuginfo-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-tools-libs-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"kernel-tools-libs-devel-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"perf-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"perf-debuginfo-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"python-perf-3.10.0-693.17.1.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"python-perf-debuginfo-3.10.0-693.17.1.el7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");