CentOS 6 : kernel (CESA-2017:2795)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:2795 and 
# CentOS Errata and Security Advisory 2017:2795 respectively.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(103517);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/11");

  script_cve_id("CVE-2017-1000253");
  script_xref(name:"RHSA", value:"2017:2795");
  script_xref(name:"IAVB", value:"2017-B-0135-S");

  script_name(english:"CentOS 6 : kernel (CESA-2017:2795)");

  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 kernel is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security
impact of Important. 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 kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es) :

* A flaw was found in the way the Linux kernel loaded ELF executables.
Provided that an application was built as Position Independent
Executable (PIE), the loader could allow part of that application's
data segment to map over the memory area reserved for its stack,
potentially resulting in memory corruption. An unprivileged local user
with access to SUID (or otherwise privileged) PIE binary could use
this flaw to escalate their privileges on the system.
(CVE-2017-1000253, Important)

Red Hat would like to thank Qualys Research Labs for reporting this
issue.");
  # https://lists.centos.org/pipermail/centos-announce/2017-September/022548.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8c1ca793");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel 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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-1000253");

  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:"2017/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-abi-whitelists");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-firmware");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2023 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:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.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-6", reference:"kernel-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-abi-whitelists-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-debug-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-debug-devel-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-devel-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-doc-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-firmware-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"kernel-headers-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"perf-2.6.32-696.10.3.el6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"python-perf-2.6.32-696.10.3.el6")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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, "kernel / kernel-abi-whitelists / kernel-debug / kernel-debug-devel / etc");
}