CentOS 7 : glibc (CESA-2018:3092)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:3092 and 
# CentOS Errata and Security Advisory 2018:3092 respectively.
#

include('compat.inc');

if (description)
{
  script_id(118992);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/27");

  script_cve_id(
    "CVE-2017-16997",
    "CVE-2018-6485",
    "CVE-2018-11236",
    "CVE-2018-11237"
  );
  script_xref(name:"RHSA", value:"2018:3092");

  script_name(english:"CentOS 7 : glibc (CESA-2018:3092)");

  script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"An update for glibc is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. 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.

The glibc packages provide the standard C libraries (libc), POSIX
thread libraries (libpthread), standard math libraries (libm), and the
name service cache daemon (nscd) used by multiple programs on the
system. Without these libraries, the Linux system cannot function
correctly.

Security Fix(es) :

* glibc: Incorrect handling of RPATH in elf/dl-load.c can be used to
execute code loaded from arbitrary libraries (CVE-2017-16997)

* glibc: Integer overflow in posix_memalign in memalign functions
(CVE-2018-6485)

* glibc: Integer overflow in stdlib/canonicalize.c on 32-bit
architectures leading to stack-based buffer overflow (CVE-2018-11236)

* glibc: Buffer overflow in __mempcpy_avx512_no_vzeroupper
(CVE-2018-11237)

For more details about the security issue(s), including the impact, a
CVSS score, and other related information, refer to the CVE page(s)
listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.6 Release Notes linked from the References section.");
  # https://lists.centos.org/pipermail/centos-cr-announce/2018-November/005408.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3f87a935");
  script_set_attribute(attribute:"solution", value:
"Update the affected glibc packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-16997");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-6485");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nscd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

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


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-common-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-devel-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-headers-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-static-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-utils-2.17-260.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nscd-2.17-260.el7")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "glibc / glibc-common / glibc-devel / glibc-headers / glibc-static / etc");
}