CentOS 7 : polkit (CESA-2019:0230)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:0230 and 
# CentOS Errata and Security Advisory 2019:0230 respectively.
#

include("compat.inc");

if (description)
{
  script_id(122719);
  script_version("1.5");
  script_cvs_date("Date: 2020/02/05");

  script_cve_id("CVE-2019-6133");
  script_xref(name:"RHSA", value:"2019:0230");

  script_name(english:"CentOS 7 : polkit (CESA-2019:0230)");
  script_summary(english:"Checks rpm output for the updated packages");

  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 polkit is now available for Red Hat Enterprise Linux 7.

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 polkit packages provide a component for controlling system-wide
privileges. This component provides a uniform and organized way for
non-privileged processes to communicate with privileged ones.

Security Fix(es) :

* polkit: Temporary auth hijacking via PID reuse and non-atomic fork
(CVE-2019-6133)

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.

Red Hat would like to thank Jan Rybar (freedesktop.org) for reporting
this issue. Upstream acknowledges Jann Horn (Google Project Zero) as
the original reporter."
  );
  # https://lists.centos.org/pipermail/centos-announce/2019-April/023271.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?9517d1cd"
  );
  # https://lists.centos.org/pipermail/centos-announce/2019-March/023215.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?5fca4ca6"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected polkit packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
  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:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-6133");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:polkit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:polkit-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:polkit-docs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/11");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  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:"polkit-0.112-18.el7_6.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"polkit-devel-0.112-18.el7_6.1")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"polkit-docs-0.112-18.el7_6.1")) 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, "polkit / polkit-devel / polkit-docs");
}