RHEL 8 : qemu (Unpatched Vulnerability)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory qemu. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(196182);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/11");

  script_cve_id(
    "CVE-2019-8934",
    "CVE-2019-15890",
    "CVE-2020-1983",
    "CVE-2020-10717",
    "CVE-2020-10756",
    "CVE-2020-13659",
    "CVE-2020-15469",
    "CVE-2020-25084",
    "CVE-2020-25741",
    "CVE-2020-25743",
    "CVE-2021-3544",
    "CVE-2021-3545",
    "CVE-2021-3546",
    "CVE-2021-3611",
    "CVE-2021-3735",
    "CVE-2023-42467",
    "CVE-2024-4693"
  );
  script_xref(name:"IAVB", value:"2020-B-0063-S");

  script_name(english:"RHEL 8 : qemu (Unpatched Vulnerability)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat 8 host is affected by multiple vulnerabilities that will not be patched.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by multiple
vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - QEMU: vhost-user-gpu: out-of-bounds write in virgl_cmd_get_capset() (CVE-2021-3546)

  - libslirp 4.0.0, as used in QEMU 4.1.0, has a use-after-free in ip_reass in ip_input.c. (CVE-2019-15890)

  - hw/ppc/spapr.c in QEMU through 3.1.0 allows Information Exposure because the hypervisor shares the
    /proc/device-tree/system-id and /proc/device-tree/model system attributes with a guest. (CVE-2019-8934)

  - A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of
    the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via
    virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a
    denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the
    host. (CVE-2020-10717)

  - 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)

  - address_space_map in exec.c in QEMU 4.2.0 can trigger a NULL pointer dereference related to BounceBuffer.
    (CVE-2020-13659)

  - In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer
    dereference. (CVE-2020-15469)

  - A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows
    crafted packets to cause a denial of service. (CVE-2020-1983)

  - QEMU 5.0.0 has a use-after-free in hw/usb/hcd-xhci.c because the usb_packet_map return value is not
    checked. (CVE-2020-25084)

  - fdctrl_write_data in hw/block/fdc.c in QEMU 5.0.0 has a NULL pointer dereference via a NULL block pointer
    for the current drive. (CVE-2020-25741)

  - hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check
    before an ide_cancel_dma_sync call. (CVE-2020-25743)

  - Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions
    up to and including 6.0. They exist in contrib/vhost-user-gpu/vhost-user-gpu.c and contrib/vhost-user-
    gpu/virgl.c due to improper release of memory (i.e., free) after effective lifetime. (CVE-2021-3544)

  - An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of
    QEMU in versions up to and including 6.0. The flaw exists in virgl_cmd_get_capset_info() in contrib/vhost-
    user-gpu/virgl.c and could occur due to the read of uninitialized memory. A malicious guest could exploit
    this issue to leak memory from the host. (CVE-2021-3545)

  - A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious
    guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service
    condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU
    versions prior to 7.0.0. (CVE-2021-3611)

  - A deadlock issue was found in the AHCI controller device of QEMU. It occurs on a software reset
    (ahci_reset_port) while handling a host-to-device Register FIS (Frame Information Structure) packet from
    the guest. A privileged user inside the guest could use this flaw to hang the QEMU process on the host,
    resulting in a denial of service condition. The highest threat from this vulnerability is to system
    availability. (CVE-2021-3735)

  - QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in hw/scsi/scsi-disk.c because
    scsi_disk_emulate_mode_select does not prevent s->qdev.blocksize from being 256. This stops QEMU and the
    guest immediately. (CVE-2023-42467)

  - QEMU: virtio-pci: improper release of configure vector leads to guest triggerable crash (CVE-2024-4693)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package
is installed.");
  script_set_attribute(attribute:"solution", value:
"The vendor has acknowledged the vulnerabilities but no solution has been provided. Refer to the vendor for remediation
guidance.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/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-2021-3546");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/02/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-kvm-ma");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:qemu-kvm-rhev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slirp4netns");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item("global_settings/vendor_unpatched"))
exit(0, "Unpatched Vulnerabilities Detection not active.");

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.x', 'Red Hat ' + 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$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'pkgs': [
      {'reference':'qemu-kvm', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'qemu-kvm', 'cves':['CVE-2019-8934', 'CVE-2020-10717', 'CVE-2020-13659', 'CVE-2020-15469', 'CVE-2020-25084', 'CVE-2020-25741', 'CVE-2020-25743']},
      {'reference':'qemu-kvm', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'qemu-kvm', 'cves':['CVE-2020-13659', 'CVE-2020-15469', 'CVE-2020-25084', 'CVE-2020-25741', 'CVE-2020-25743', 'CVE-2021-3544', 'CVE-2021-3545', 'CVE-2021-3546', 'CVE-2021-3611', 'CVE-2021-3735', 'CVE-2023-42467', 'CVE-2024-4693']},
      {'reference':'slirp4netns', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'slirp4netns', 'cves':['CVE-2019-15890', 'CVE-2020-1983', 'CVE-2020-10756']}
    ]
  }
];


var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  var enterprise_linux_flag = rhel_repo_urls_has_content_dist_rhel(repo_urls:repo_relative_urls);
  foreach var pkg ( constraint_array['pkgs'] ) {
    var unpatched_pkg = NULL;
    var _release = NULL;
    var sp = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['unpatched_pkg'])) unpatched_pkg = pkg['unpatched_pkg'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (unpatched_pkg &&
        _release &&
        (!exists_check || rpm_exists(release:_release, rpm:exists_check)) &&
        unpatched_package_exists(release:_release, package:unpatched_pkg, cves: cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : unpatched_packages_report()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'qemu-kvm / slirp4netns');
}