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nessusThis script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.ORACLELINUX_ELSA-2022-9344.NASL
HistoryApr 30, 2022 - 12:00 a.m.

Oracle Linux 7 : qemu (ELSA-2022-9344)

2022-04-3000:00:00
This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
14

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2022-9344 advisory.

  • A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0.
    The self pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it’s not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node. (CVE-2021-4145)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2022-9344.
##

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

if (description)
{
  script_id(160385);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/15");

  script_cve_id("CVE-2021-4145");
  script_xref(name:"IAVB", value:"2022-B-0051-S");

  script_name(english:"Oracle Linux 7 : qemu (ELSA-2022-9344)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2022-9344 advisory.

  - A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0.
    The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A
    malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host
    when writing data reaches the threshold of mirroring node. (CVE-2021-4145)

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://linux.oracle.com/errata/ELSA-2022-9344.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C");
  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:N/I:N/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-2021-4145");

  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:"2022/01/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ivshmem-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-block-gluster");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-block-iscsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-block-rbd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-img");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-kvm-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-system-aarch64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-system-aarch64-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-system-x86");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:qemu-system-x86-core");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Oracle 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/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
var os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', 'Oracle Linux ' + os_ver);

if (!get_kb_item('Host/RedHat/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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var pkgs = [
    {'reference':'ivshmem-tools-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-gluster-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-gluster-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-iscsi-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-iscsi-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-rbd-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-block-rbd-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-common-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-common-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-img-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-img-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-kvm-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-kvm-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-kvm-core-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-kvm-core-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-system-aarch64-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-system-aarch64-core-4.2.1-16.el7', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-system-x86-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'},
    {'reference':'qemu-system-x86-core-4.2.1-16.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'15'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  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 = 'EL' + 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) {
    if (exists_check) {
        if (rpm_exists(release:release, rpm:exists_check) && 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++;
    } else {
        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 (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, 'ivshmem-tools / qemu / qemu-block-gluster / etc');
}
VendorProductVersionCPE
oraclelinux7cpe:/o:oracle:linux:7
oraclelinuxivshmem-toolsp-cpe:/a:oracle:linux:ivshmem-tools
oraclelinuxqemup-cpe:/a:oracle:linux:qemu
oraclelinuxqemu-block-glusterp-cpe:/a:oracle:linux:qemu-block-gluster
oraclelinuxqemu-block-iscsip-cpe:/a:oracle:linux:qemu-block-iscsi
oraclelinuxqemu-block-rbdp-cpe:/a:oracle:linux:qemu-block-rbd
oraclelinuxqemu-commonp-cpe:/a:oracle:linux:qemu-common
oraclelinuxqemu-imgp-cpe:/a:oracle:linux:qemu-img
oraclelinuxqemu-kvmp-cpe:/a:oracle:linux:qemu-kvm
oraclelinuxqemu-kvm-corep-cpe:/a:oracle:linux:qemu-kvm-core
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