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nessusThis script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.ORACLELINUX_ELSA-2023-5749.NASL
HistoryOct 18, 2023 - 12:00 a.m.

Oracle Linux 9 : .NET / 7.0 (ELSA-2023-5749)

2023-10-1800:00:00
This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
14
oracle linux
.net
7.0
elsa-2023-5749
http/2
cve-2023-44487
denial of service
nessus
oracle
vulnerability
exploit

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.4

Confidence

High

EPSS

0.816

Percentile

98.4%

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2023-5749 advisory.

  • The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-44487)

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 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2023-5749.
##

include('compat.inc');

if (description)
{
  script_id(183321);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/23");

  script_cve_id("CVE-2023-44487");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2023/10/31");
  script_xref(name:"CEA-ID", value:"CEA-2024-0004");
  script_xref(name:"IAVB", value:"2023-B-0083-S");

  script_name(english:"Oracle Linux 9 : .NET / 7.0 (ELSA-2023-5749)");

  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 9 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2023-5749 advisory.

  - The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation
    can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-44487)

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-2023-5749.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-44487");

  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:"2023/10/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:oracle:linux:9::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:oracle:linux:9::codeready_builder");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:aspnetcore-runtime-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:aspnetcore-targeting-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-apphost-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-hostfxr-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-runtime-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-sdk-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-sdk-7.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-targeting-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dotnet-templates-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:netstandard-targeting-pack-2.1");
  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:"Oracle Linux 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/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 os_release = get_kb_item("Host/RedHat/release");
if (isnull(os_release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^9([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 9', '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':'aspnetcore-runtime-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'aspnetcore-targeting-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-apphost-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-host-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-hostfxr-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-runtime-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-sdk-7.0-7.0.112-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-sdk-7.0-source-built-artifacts-7.0.112-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-targeting-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-templates-7.0-7.0.112-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'netstandard-targeting-pack-2.1-7.0.112-1.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'aspnetcore-runtime-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'aspnetcore-targeting-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-apphost-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-host-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-hostfxr-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-runtime-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-sdk-7.0-7.0.112-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-sdk-7.0-source-built-artifacts-7.0.112-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-targeting-pack-7.0-7.0.12-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dotnet-templates-7.0-7.0.112-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'netstandard-targeting-pack-2.1-7.0.112-1.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE}
];

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_HOLE,
      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, 'aspnetcore-runtime-7.0 / aspnetcore-targeting-pack-7.0 / dotnet-apphost-pack-7.0 / etc');
}

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.4

Confidence

High

EPSS

0.816

Percentile

98.4%