AlmaLinux 8 : virt:rhel (ALSA-2020:4059)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2020:4059.
##

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

if (description)
{
  script_id(157519);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/06");

  script_cve_id("CVE-2020-10756", "CVE-2020-14364");
  script_xref(name:"ALSA", value:"2020:4059");
  script_xref(name:"IAVB", value:"2020-B-0063-S");

  script_name(english:"AlmaLinux 8 : virt:rhel (ALSA-2020:4059)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2020:4059 advisory.

  - An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator.
    This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known
    as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible
    information disclosure. This flaw affects versions of libslirp before 4.3.1. (CVE-2020-10756)

  - An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before
    5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its
    'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the
    QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the
    privileges of the QEMU process on the host. (CVE-2020-14364)

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://errata.almalinux.org/8/ALSA-2020-4059.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:L/PR:L/UI:N/S:C/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-14364");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-10756");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libiscsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libiscsi-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libiscsi-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:netcf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:netcf-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:netcf-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:sgabios");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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/AlmaLinux/release", "Host/AlmaLinux/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);
var release = get_kb_item('Host/AlmaLinux/release');
if (isnull(release) || 'AlmaLinux' >!< release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
var os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var 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, 'AlmaLinux', cpu);

var module_ver = get_kb_item('Host/AlmaLinux/appstream/virt-devel');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module virt-devel:rhel');
if ('rhel' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module virt-devel:' + module_ver);

var appstreams = {
    'virt-devel:rhel': [
      {'reference':'libiscsi-1.18.0-8.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libiscsi-devel-1.18.0-8.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libiscsi-utils-1.18.0-8.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'netcf-0.2.8-12.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'netcf-devel-0.2.8-12.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'netcf-libs-0.2.8-12.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'sgabios-0.20170427git-3.module_el8.3.0+2048+e7a0a3ea', 'cpu':'i686', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
    ]
};

var flag = 0;
var appstreams_found = 0;
foreach module (keys(appstreams)) {
  var appstream = NULL;
  var appstream_name = NULL;
  var appstream_version = NULL;
  var appstream_split = split(module, sep:':', keep:FALSE);
  if (!empty_or_null(appstream_split)) {
    appstream_name = appstream_split[0];
    appstream_version = appstream_split[1];
    if (!empty_or_null(appstream_name)) appstream = get_one_kb_item('Host/AlmaLinux/appstream/' + appstream_name);
  }
  if (!empty_or_null(appstream) && appstream_version == appstream || appstream_name == 'all') {
    appstreams_found++;
    foreach package_array ( appstreams[module] ) {
      var reference = NULL;
      var release = NULL;
      var sp = NULL;
      var cpu = NULL;
      var el_string = NULL;
      var rpm_spec_vers_cmp = NULL;
      var epoch = NULL;
      var allowmaj = NULL;
      var exists_check = NULL;
      if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
      if (!empty_or_null(package_array['release'])) release = 'Alma-' + 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['el_string'])) el_string = package_array['el_string'];
      if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
      if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
      if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
      if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
      if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
        if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
      }
    }
  }
}

if (!appstreams_found) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module virt-devel:rhel');

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libiscsi / libiscsi-devel / libiscsi-utils / netcf / netcf-devel / etc');
}