Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2026-1577)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-1577.
##

include('compat.inc');

if (description)
{
  script_id(306226);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/13");

  script_cve_id(
    "CVE-2026-21710",
    "CVE-2026-21713",
    "CVE-2026-21714",
    "CVE-2026-21715",
    "CVE-2026-21716",
    "CVE-2026-21717"
  );

  script_name(english:"Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2026-1577)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1577 advisory.

    A flaw in Node.js HTTP request handling causes an uncaught TypeError when a request is received with a
    header named __proto__ and the application accesses req.headersDistinct.

    When this occurs, dest[__proto__] resolves to Object.prototype rather than undefined, causing .push() to
    be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be
    intercepted by error event listeners, meaning it cannot be handled without wrapping every
    req.headersDistinct access in a try/catch.

    This vulnerability affects all Node.js HTTP servers on 20.x, 22.x, 24.x, and v25.x

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#denial-of-service-via-
    __proto__-header-name-in-reqheadersdistinct-uncaught-typeerror-crashes-nodejs-process-cve-2026-21710---
    high (CVE-2026-21710)

    A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided
    signatures, potentially leaking timing information proportional to the number of matching bytes. Under
    certain threat models where high-resolution timing measurements are possible, this behavior could be
    exploited as a timing oracle to infer HMAC values.

    Node.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this
    is an oversight rather than an intentional design decision.

    This vulnerability affects 20.x, 22.x, 24.x, and 25.x.

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#timing-side-channel-in-hmac-
    verification-via-memcmp-in-crypto_hmaccc-leads-to-potential-mac-forgery-cve-2026-21713---medium
    (CVE-2026-21713)

    A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE frames on stream 0
    (connection-level) that cause the flow control window to exceed the maximum value of 231-1. The server
    correctly sends a GOAWAY frame, but the Http2Session object is never cleaned up.

    This vulnerability affects HTTP2 users on Node.js 20, 22, 24 and 25.

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#memory-leak-in-nodejs-
    http2-server-via-window_update-on-stream-0-leads-to-resource-exhaustion-cve-2026-21714---medium
    (CVE-2026-21714)

    A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync.native() without the
    required read permission checks, while all comparable filesystem functions correctly enforce them. As a
    result, code running under --permission with restricted --allow-fs-read can still use
    fs.realpathSync.native() to check file existence, resolve symlink targets, and enumerate filesystem paths
    outside of permitted directories.This vulnerability affects 20.x, 22.x, 24.x, and 25.x processes using the
    Permission Model where --allow-fs-read is intentionally restricted.

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#permission-model-bypass-in-
    realpathsyncnative-allows-file-existence-disclosure-cve-2026-21715---low (CVE-2026-21715)

    An incomplete fix for CVE-2024-36137 leaves FileHandle.chmod() and FileHandle.chown() in the promises API
    without the required permission checks, while their callback-based equivalents (fs.fchmod(), fs.fchown())
    were correctly patched.

    As a result, code running under --permission with restricted --allow-fs-write can still use promise-based
    FileHandle methods to modify file permissions and ownership on already-open file descriptors, bypassing
    the intended write restrictions.

    This vulnerability affects 20.x, 22.x, 24.x, and 25.x processes using the Permission Model where --allow-
    fs-write is intentionally restricted.

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#cve-2024-36137-patch-bypass---
    filehandlechmodchown-cve-2026-21716---low (CVE-2026-21716)

    A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value,
    making hash collisions trivially predictable. By crafting a request that causes many such collisions in
    V8's internal string table, an attacker can significantly degrade performance of the Node.js process.

    The most common trigger is any endpoint that calls JSON.parse() on attacker-controlled input, as JSON
    parsing automatically internalizes short strings into the affected hash table.

    This vulnerability affects 20.x, 22.x, 24.x, and 25.x.

    NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#hashdos-in-v8-cve-2026-21717
    ---medium (CVE-2026-21717)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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://alas.aws.amazon.com//AL2023/ALAS2023-2026-1577.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21710.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21713.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21714.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21715.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21716.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-21717.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update nodejs20 --releasever 2023.11.20260413' or
  or 'dnf update --advisory ALAS2023-2026-1577 --releasever 2023.11.20260413' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-21713");

  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:"2026/03/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-full-i18n");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nodejs20-npm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:v8-11.3-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'nodejs20-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-debuginfo-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-debuginfo-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-debugsource-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-debugsource-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-devel-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-devel-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-docs-20.20.2-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-full-i18n-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-full-i18n-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-libs-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-libs-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-libs-debuginfo-20.20.2-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-libs-debuginfo-20.20.2-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-npm-10.8.2-1.20.20.2.1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'nodejs20-npm-10.8.2-1.20.20.2.1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'v8-11.3-devel-11.3.244.8-1.20.20.2.1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'v8-11.3-devel-11.3.244.8-1.20.20.2.1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', '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;
  var cves = 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 (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  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, cves:cves)) 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, "nodejs20 / nodejs20-debuginfo / nodejs20-debugsource / etc");
}