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nessusThis script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.FEDORA_2023-68DF3F4B02.NASL
HistoryAug 29, 2023 - 12:00 a.m.

Fedora 38 : qemu (2023-68df3f4b02)

2023-08-2900:00:00
This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
2
qemu
fedora 38
cve-2023-0664
vulnerability
privilege escalation
cve-2023-3354
denial of service
cve-2023-3255
buffer overflow
cve-2023-3180

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.9 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

52.4%

The remote Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-68df3f4b02 advisory.

  • A flaw was found in the QEMU Guest Agent service for Windows. A local unprivileged user may be able to manipulate the QEMU Guest Agent’s Windows installer via repair custom actions to elevate their privileges on the system. (CVE-2023-0664)

  • A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service. (CVE-2023-3354)

  • A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the inflate_buffer function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service. (CVE-2023-3255)

  • A flaw was found in the QEMU virtual crypto device while handling data encryption/decryption requests in virtio_crypto_handle_sym_req. There is no check for the value of src_len and dst_len in virtio_crypto_sym_op_helper, potentially leading to a heap buffer overflow when the two values differ.
    (CVE-2023-3180)

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

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2023-68df3f4b02
#

include('compat.inc');

if (description)
{
  script_id(180225);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/29");

  script_cve_id(
    "CVE-2023-0664",
    "CVE-2023-3180",
    "CVE-2023-3255",
    "CVE-2023-3354"
  );
  script_xref(name:"IAVB", value:"2023-B-0019-S");
  script_xref(name:"FEDORA", value:"2023-68df3f4b02");
  script_xref(name:"IAVB", value:"2023-B-0058-S");
  script_xref(name:"IAVB", value:"2023-B-0073-S");

  script_name(english:"Fedora 38 : qemu (2023-68df3f4b02)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Fedora host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the
FEDORA-2023-68df3f4b02 advisory.

  - A flaw was found in the QEMU Guest Agent service for Windows. A local unprivileged user may be able to
    manipulate the QEMU Guest Agent's Windows installer via repair custom actions to elevate their privileges
    on the system. (CVE-2023-0664)

  - A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks
    whether the current number of connections crosses a certain threshold and if so, cleans up the previous
    connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the
    connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated
    client to cause a denial of service. (CVE-2023-3354)

  - A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit
    condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the
    `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard
    to the VNC server to trigger a denial of service. (CVE-2023-3255)

  - A flaw was found in the QEMU virtual crypto device while handling data encryption/decryption requests in
    virtio_crypto_handle_sym_req. There is no check for the value of `src_len` and `dst_len` in
    virtio_crypto_sym_op_helper, potentially leading to a heap buffer overflow when the two values differ.
    (CVE-2023-3180)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bodhi.fedoraproject.org/updates/FEDORA-2023-68df3f4b02");
  script_set_attribute(attribute:"solution", value:
"Update the affected 2:qemu package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/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:U/C:H/I:H/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-2023-0664");

  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:"2023/03/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:38");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:qemu");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');

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) || 'Fedora' >!< os_release) audit(AUDIT_OS_NOT, 'Fedora');
var os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Fedora');
os_ver = os_ver[1];
if (! preg(pattern:"^38([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Fedora 38', 'Fedora ' + 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Fedora', cpu);

var pkgs = [
    {'reference':'qemu-7.2.5-1.fc38', 'release':'FC38', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
];

var flag = 0;
foreach 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;
  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['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 (reference && _release) {
    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, 'qemu');
}
VendorProductVersionCPE
fedoraprojectfedora38cpe:/o:fedoraproject:fedora:38
fedoraprojectfedoraqemup-cpe:/a:fedoraproject:fedora:qemu

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.9 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

52.4%