SUSE SLES11 Security Update : openvpn-openssl1 (SUSE-SU-2021:14723-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:14723-1. The text itself
# is copyright (C) SUSE.
##

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

if (description)
{
  script_id(150543);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/26");

  script_cve_id("CVE-2018-7544", "CVE-2020-15078");
  script_xref(name:"SuSE", value:"SUSE-SU-2021:14723-1");

  script_name(english:"SUSE SLES11 Security Update : openvpn-openssl1 (SUSE-SU-2021:14723-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in
the SUSE-SU-2021:14723-1 advisory.

  - ** DISPUTED ** A cross-protocol scripting issue was discovered in the management interface in OpenVPN
    through 2.4.5. When this interface is enabled over TCP without a password, and when no other clients are
    connected to this interface, attackers can execute arbitrary management commands, obtain sensitive
    information, or cause a denial of service (SIGTERM) by triggering XMLHttpRequest actions in a web browser.
    This is demonstrated by a multipart/form-data POST to http://localhost:23000 with a signal SIGTERM
    command in a TEXTAREA element. NOTE: The vendor disputes that this is a vulnerability. They state that
    this is the result of improper configuration of the OpenVPN instance rather than an intrinsic
    vulnerability, and now more explicitly warn against such configurations in both the management-interface
    documentation, and with a runtime warning. (CVE-2018-7544)

  - OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control
    channel data on servers configured with deferred authentication, which can be used to potentially trigger
    further information leaks. (CVE-2020-15078)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1085803");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1185279");
  # https://lists.suse.com/pipermail/sle-security-updates/2021-May/008765.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?33036921");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2018-7544");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-15078");
  script_set_attribute(attribute:"solution", value:
"Update the affected openvpn-openssl1 and / or openvpn-openssl1-down-root-plugin packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P");
  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:N/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-2018-7544");

  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:"2018/03/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:openvpn-openssl1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:openvpn-openssl1-down-root-plugin");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES11', 'SUSE ' + os_ver);

if (!get_kb_item("Host/SuSE/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 && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE ' + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES11" && (! preg(pattern:"^(0)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP0", os_ver + " SP" + sp);

pkgs = [
    {'reference':'openvpn-openssl1-2.3.2-0.10.9', 'sp':'0', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.3-0'},
    {'reference':'openvpn-openssl1-down-root-plugin-2.3.2-0.10.9', 'sp':'0', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.3-0'},
    {'reference':'openvpn-openssl1-2.3.2-0.10.9', 'sp':'0', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.3-0'},
    {'reference':'openvpn-openssl1-down-root-plugin-2.3.2-0.10.9', 'sp':'0', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.3-0'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  sp = NULL;
  cpu = NULL;
  exists_check = NULL;
  rpm_spec_vers_cmp = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && release && exists_check) {
    if (rpm_exists(release:release, rpm:exists_check) && rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
  else if (reference && release) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) 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, 'openvpn-openssl1 / openvpn-openssl1-down-root-plugin');
}