RHEL 7 : .NET Core (RHSA-2017:3248)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:3248. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(104774);
  script_version("3.12");
  script_cvs_date("Date: 2019/10/24 15:35:44");

  script_cve_id("CVE-2017-11770", "CVE-2017-8585");
  script_xref(name:"RHSA", value:"2017:3248");

  script_name(english:"RHEL 7 : .NET Core (RHSA-2017:3248)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"A security update for .NET Core on RHEL is now available.

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

New versions of .NET Core that address several security
vulnerabilities are now available. The updated versions are .NET Core
1.0.8, 1.1.5 and 2.0.3.

Security Fix(es) :

* By providing an invalid culture, an attacker can cause a recursive
lookup that leads to a denial of service when running on certain
Windows platforms. (CVE-2017-8585)

* Supplying a specially crafted certificate can cause an infinite
X509Chain, resulting in a denial of service. (CVE-2017-11770)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/dotnet/announcements/issues/34"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/dotnet/announcements/issues/44"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/dotnet/core/blob/master/release-notes/2.0/2.0.3.md"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/dotnet/core/blob/master/release-notes/1.1/1.1.5.md"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/dotnet/core/blob/master/release-notes/1.0/1.0.8.md"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2017:3248"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-8585"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-11770"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnet20-dotnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnet20-dotnet-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnet20-dotnet-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnet20-dotnet-runtime-2.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnet20-dotnet-sdk-2.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnetcore10-dotnetcore");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnetcore10-dotnetcore-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnetcore11-dotnetcore");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-dotnetcore11-dotnetcore-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/11/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/11/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "Red Hat " + os_ver);

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 ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2017:3248";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnet20-dotnet-2.0.3-4.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnet20-dotnet-debuginfo-2.0.3-4.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnet20-dotnet-host-2.0.3-4.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnet20-dotnet-runtime-2.0-2.0.3-4.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnet20-dotnet-sdk-2.0-2.0.3-4.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnetcore10-dotnetcore-1.0.8-1.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnetcore10-dotnetcore-debuginfo-1.0.8-1.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnetcore11-dotnetcore-1.1.5-1.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rh-dotnetcore11-dotnetcore-debuginfo-1.1.5-1.el7")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "rh-dotnet20-dotnet / rh-dotnet20-dotnet-debuginfo / etc");
  }
}